Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Complex-Radical Copolymerization of Allyl Cinnamate with Styrene (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 6292-6296 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00100a010
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Complex-radical terpolymerization of phenanthrene, maleic anhydride, and trans-stilbene (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 7-13 
    Details
    ISSN: 0887-624X
    Keywords: radical terpolymerization ; charge transfer complexes ; phenanthrene ; maleic anhydride ; trans-stilbene ; thermal stability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The radical terpolymerization of the donor-acceptor-donor monomer system, phenanthrene (P) - maleic anhydride (M) - trans-stilbene (S), was studied. These monomers are known to be nonhomopolymerizable. The terpolymerization was carried out in p-dioxane and/or toluene at 70°C in the presence of benzoyl peroxide used as the initiator. P and S were found to form charge transfer complexes (CTC) with M in p-dioxane at 35°C. The results obtained are discussed in terms of the free monomer and complex propagation models. It is shown that terpolymerization is carried out at a stage close to binary copolymerization of two complexomers. The reactivity ratio of P … M and S … M complexes was estimated by the Kelen-Tüdös method. Absorbance ratios at 1770 cm-1 (vC=0 of anhydride group), 764 cm-1 (δCH in monosubstituted benzene of S), and 820 cm-1 (δCH in disubstituted benzene of P) as a function of terpolymer composition were established. P - M - S terpolymers are shown to have high thermal stabilities. © 1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080330102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Complex-radical terpolymerization of allylglycidyl ether, maleic anhydride, and methyl methacrylate: Design of self-crosslinking macromolecules (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 1447-1454 
    Details
    ISSN: 0887-624X
    Keywords: terpolymerization ; charge transfer complex ; allylglycidyl ether ; maleic anhydride ; methyl methacrylate ; thermo-crosslinking ; photo-crosslinking ; thermal degradation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Radical copolymerization of donor-acceptor monomers, i.e., allylglycidyl ether (AGE), maleic anhydride (MA) and methyl methacrylate (MMA) are studied, where binary copolymerization of AGE...MA complex with MMA is obtained. Constants of charge transfer complex formation (Kc) and copolymerization (r1 and r2) are determined by 1H-NMR and Kelen-Tüdöş methods, respectively. It is found that synthesized film-forming terpolymers with free epoxy and anhydride groups on side chain of macro-molecules are being crosslinked easily under the effect of temperature and/or UV-ir-radiation. Observed crosslinking effect is proved by the DTA, TGA, and IR spectroscopic analyses. It is shown that complex-radical terpolymerization is very convenient method for the designing of reactive functional macromolecules of linear structure with self-crosslinking properties which can serve as a basis for the use in photolithographic applications. © 1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080330905
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Effects of complex formation and cyclization in radical copolymerization of allyl(metha)acrylates with maleic anhydride (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 1501-1508 
    Details
    ISSN: 0887-624X
    Keywords: copolymerization ; charge transfer complex ; cyclization ; allyl acrylate ; allyl methacrylate ; maleic anhydride ; chain growth reactions ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Radical copolymerization of allyl acrylate (AA) and allyl methacrylate (AMA) as bifunctional monomers of donor (allyl)-acceptor (acryl) type with maleic anhydride (MA) as an acceptor monomer were carried out in metrhyl ethyl ketone (MEK) at 50-70°C in the presence of 2,2′-azoisobutyronitrile (AIBN) as initiator. Constants of complex formation (Kc), cyclization (kcl), and copolymerization (r1, r2, r1c, r1c1, and r1c2) as well as energies of activation for cyclization (Eac) and copolymerization reactions (Ea), and orders for the monomer (m) and initiator (n) concentrations were determined. The following values were found, for AA and AMA, respectively: Kc = 0.038 and 0.11 L/mol in deutered acetone at 35 ± 0.1°C, kcl = 6.45 and 6.53, r1 = 0.083 ± 0.005 and 0.028 ± 0.002, r2 = 0.027 ± 0.002 and 0.063 ± 0.003 (by the Kelen-Tüdös method), r1c = 0.04 and 0.025, r1c1 = 0.128 and 0.176, r1c2 = 0.127 and 0.177 (by the Seiner-Litt equation), Eac = 28.9 and 28.7 kJ/mol, Ea = 67.0 and 87.9 kJ/mol, m = 1.53 and 1.45, and n = 0.50 and 0.52. The presence of cyclic, unsaturated, and anhydride fragments in the macromolecules was confirmed with FTIR data and chemical (iodometrical and potentiometric titrations) analysis. It was established that complex formation in the monomer systems studied is the main factor for alternating cyclocopolymerization leading to formation of copolymers containing lactone and linear-unsaturated fragments in the macromolecular chain. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1501-1508, 1998
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Tin effect in formation and photocross-linking reactions of tri-n-butylstannyl methacrylate - allyl chloroacetate copolymer (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 2339-2345 
    Details
    ISSN: 0887-624X
    Keywords: copolymerization ; photocross-linking reaction ; photosensitivity ; quantum efficiency ; organotin copolymer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Radical-initiated copolymerization of tri-n-butylstannyl methacrylate (TBSM) with allyl chloroacetate (ACA) was carried out in the presence of benzoyl peroxide as initiator in benzene at 70°C in nitrogen atmosphere. Monomer reactivity ratios of the TBSM (M1)-ACA (M2) monomer pair were determined by the Kelen-Tüdöş method: r1 = 1.25 ± 0.02 and r2 = 0.13 ± 0.005. From copolymerization kinetic data the values of effective energy of activation (Ea) and orders with respect to initiator (n) and to monomers (m), Ea = 79.0 kJ/mol, n = 0.51, and m = 1.2, were determined. Photochemical reactions of the copolymer were studied by using monochromatic UV-irradiation at 405 nm and FTIR spectroscopy. For the copolymer synthesized the quantum efficiency (φcrl = 0.62 mol/Einstein) and photosensitivity S = 25.5 cm2/J (in the presence of 1,9-dibromoanthracene as a sensitizer) were found. It was shown that the effects observed of the tin atom and Cl substituent via pentacoordinated complex ( - R3Sn…O=C - ) and σ(Cl - CH2)-π(C=O)-π(allyl) conjugation, respectively, are the main factors for reducing degradative chain transfer and for increasing the tendency of monomers to alternate as well as for the photocrosslinking of copolymer macromolecules. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2339-2345, 1998
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Plasma polymerization of some silicon- and tin-containing monomers (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 37 (1995), S. 119-128 
    Details
    ISSN: 0959-8103
    Keywords: plasma polymerization ; organosilicon monomers ; organotin monomers ; plasma kinetic parameters ; deposition rate ; structure ; thermostability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Plasma polymerization of several selected saturated and unsaturated silicon- and tin-containing monomers, such as vinyltriethoxysilane (VTES), 3-aminopropyltriethoxysilane (APTS), hexamethyldisiloxane (HMDS), hexabutyldistannoxane (HBDS) and tetraethylstannane (TES), were examined in terms of the following selected plasma operational parameters: discharge time (t), flow rate of monomer (F) and power input (W). For the initial deposition rates (DR), the following empirical equation was proposed: DR = k ta Fb Wc, from which the experimental values of the kinetic power factors (a,b,c and k) were calculated. The value of k calculated for VTES was the highest, indicating the high activity of the monomer in plasma in contrast to HBDS, which was about two orders of magnitude smaller. A modified Arrehnius equation was employed in the form of yield of deposition (DR/F) versus the specific energy (W/F), which showed that silicon-containing monomers are more active than their organotin analogues in the chosen plasma conditions. Plasma polymers of HMDS, TES and HBDS prepared at low conversions were highly crosslinked and their structures were similar to those of crosslinked poly(dialkylsiloxane) or poly(organostannoxane) while those of VTES and APTS were primarily linear.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1995.210370206
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Complex-radical alternating copolymerization of trans-stilbene with N-substituted maleimides (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 41 (1996), S. 259-265 
    Details
    ISSN: 0959-8103
    Keywords: copolymerization ; charge-transfer complex ; trans-stilbene ; N-maleimide ; N-ethylmaleimide ; N-phenylmaleimide ; structure ; thermal degradation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Radical copolymerization of donor-acceptor monomers, i.e. trans-stilbene (Stb) with N-maleimide (MI), N-ethylmaleimide (EtMI) and N-phenylmaleimide (PhMI), are studied. Constants of charge-transfer complex formation (Kc) and copolymerization (r1 and r2) are determined by Hanna-Ashbaugh (1H nuclear magnetic resonance) and Kelen-Tüdöş methods, respectively. The results obtained were analysed by use of the complex copolymerization model of Seiner-Litt. It is found that the tendency for complex formation and the tendency for alternation of monomers depend on the nature of the N-substituent in the maleimide molecule. Kc is found to increase in the order EtMI 〈 MI 〈 PhMI, and the tendency for alternation (r1 · r2) decreases in the order MI 〉 EtMI 〉 PhMI. It is shown by thermogravimetric analysis, differential thermal analysis and differential scanning calorimetry that the alternating copolymers synthesized have high thermostabilities. The copolymers synthesized show increased thermal stabilities, as well as glass transition temperatures, with the change of imide N-substituent. Stb-MI, Stb-EtMI and Stb-PhMI copolymers decompose through a one-step reaction at 456, 460 and 468°C, respectively.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 8
    Electronic Resource
    Electronic Resource
    Side-chain functionalization of polystyrene with maleic anhydride in the presence of lewis acids (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 59 (1996), S. 235-241 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polystyrenes with different molecular weights were chemically modified with maleic anhydride by use of certain cationic catalysts of Lewis acid type (BF3·OEt2, AICI3, TiCL4, ZnCl2, FeCl3, and SnCl4) in chloroform. The effects of molecular weight of polystyrene, as well as type of Lewis acid used, on properties and structure of products were investigated. The interrelation between the molecular weight of polystyrene and content of carboxyl groups in the products was made. A direct relationship between the activity of catalyst used and the number of carboxyl groups was found. For characterization of side-chain functionalized polystyrene, fractional precipitation was applied which yielded carboxyl groups in all fractions. The carboxyl group concentrations were found to be the highest in the case of BF3·OEt2. Modified polystyrene samples containing —CO—CH=CH—COOH fragments in side chains are easily crosslinked at 140-150°C and by UV irradiation as proved by IR, DTA, and TGA analyses. Functionalized polymers obtained are characterized by their high thermostability, adhesion, and photosensitivity. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 9
    Electronic Resource
    Electronic Resource
    Plasma surface modification of propylene-based polymers by silicon and tin-containing compounds (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 645-651 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Plasma surface modifications of homo-, co-, and terpolymers of propylene films in the presence of selected organosilicon and organotin compounds were investigated. For this, organosilan(stannan)e type compounds (such as vinyltriethoxysilane, 3-aminopropyltriethoxysilane, and tetraethylstannane) as well as organosiloxan (stannoxan)e type compounds (such as hexamethyldisiloxane and hexabutyldistannoxane) were exployed in plasma. Plasma surface modification of polyolefin films with organosilicon plasma has led to increase of the hydrophobicity, while the presence of organotin compounds in plasma produced less hydrophobic surfaces. Reaction of plasma-activated polyolefin films further with vinyltriethoxysilane-maleic anhydride oligomer also led to an increase in the hydrophobicity of polypropylene surfaces. It is observed that the degrees of swelling of (virgin, plasma-treated, and plasma-modified) polypropylene films in cyclohexanone strongly depend on the nature of the organoelement compounds used, organosilicon plasma causing lower degrees of swelling. The changes of surface properties observed are explained by different surface structures produced in plasma: in the case of organosilicon compounds, it is believed that poly(organosiloxane) and for organotin compounds poly(organotincarboxylate) fragments are formed primarily. © 1995 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580319
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Complex-radical alternating terpolymerization of maleic anhydride, trans-stilbene and N-phenylmaleimide (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 196 (1995), S. 1999-2009 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Radical terpolymerizations of maleci anhydride (MA), trans-stilbene (Stb) and N-phenylmale-imide (PhMI) were carried out in methyl ethyl ketone (MEK) at 60-80°C in the presence of 2,2′-azoisobutyronitrile (AIBN) as initiator. The terpolymerization was evaluated by using either the free monomer or complex participation models. The relative of MA toward poly(Stb) radical was found to be about 10,6 times lower than that of PhMl. The initial rate of copolymerization, the participation of the charge transfer complex (CTC) monomers and free monomers was quantitatively estimated. It was established that, even with a considerable change in the ratio of electron-acceptor monomers (MA and PhMI) in the initial reaction mixture, terpolymers possessed always a composition ratio close to 1:2:1. Constants for copolymerization of MA…Stb (M1) and PhMI…Stb (M3) were determined by using the Kelen-Tüdős equation, and r1 · K1/K3 = 0,03 and r2 · K3/1 =0,08, where K1 and K3 are complex-formation constants of MA…Stb and PhMl…Stb complexes, respectively, were obtained. The result of kinetic studies of terpolymerization was interpreted as involving mainly alternating copolymerization of two complexomers with predominant participation in chain growth. Thermogravimetric analyses indicated the high thermal stabilities of terpolymers obtained.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1995.021960619
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...