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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of a new monomer with pendant hindered amine group (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 29 (1991), S. 1889-1893 
    Details
    ISSN: 0887-624X
    Keywords: piperidinyl carbamate ; HALS ; synthesis ; characterization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new monomer, 1,2,2,6,6-pentamethyl-4-piperidinyl m-isopropenyl-α, α-dimethylbenzyl carbamate, was synthesized by direct addition of 1,2,2,6,6-pentamethyl-4-piperidinol to m-isopropenyl-α, α-dimethylbenzyl isocyanate in the presence of dibutyltin dilaurate catalyst at elevated temperatures. It was characterized by FT-IR, 1H-NMR. MS, and elemental analysis. It is a potential hindered amine light stabilizer as it contains the 2,2,6,6-tetraalkylpiperidine moiety and its vinylic functionality makes it polymerizable.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1991.080291307
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  • 2
    Electronic Resource
    Electronic Resource
    Polymerization behavior of 2,2,6,6-tetramethylpiperidinyl methacrylate: A monomer carrying a hindered amine group (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 983-988 
    Details
    ISSN: 0887-624X
    Keywords: copolymerization ; 2,2,6,6-tetramethylpiperidinyl methacrylate ; HALS ; copolymer structure ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolymers of 2,2,6,6-tetramethylpiperidinyl methacrylate (TPMA) with styrene (S) and with methyl methacrylate (MMA) were synthesized using AIBN as initiator. S-TPMA copolymers from feed ranging from 0.10-0.80 mole fractions TPMA and MMA-TPMA copolymers from feed of 0.04-0.85 mole fractions TPMA were used in the determination of monomer reactivity ratios r1, r2. Four different methods were employed in the calculations of r1 and r2 and all calculated results were in good agreement with each other. The structure of S-TPMA copolymers was inferred to be of an alternating nature while that of MMA-TPMA copolymers was random. Both copolymers are potential hindered amine light stabilizers (HALS) and are expected to be less extractable from, and more compatible with, polystyrene and poly(methyl methacrylate) base polymers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300604
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polymerization behavior of 1,2,2,6,6-pentamethyl-4-piperidinyl m-isopropenyl-α,α-dimethylbenzyl carbamate (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 1499-1503 
    Details
    ISSN: 0887-624X
    Keywords: copolymerization ; 1,2,2,6,6-pentamethyl-4-piperidinyl ; m-isopropenyl-α,α-dimethylbenzyl carbamate ; HALS ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolymers of 1,2,2,6,6-pentamethyl-4-piperidinyl m-isopropenyl-α,α-dimethylbenzyl carbamate (CB) with styrene (S) and with methyl methacrylate (MMA) were synthesized using AIBN as initiator. S-CB copolymers made from feed ranging from 0.45-0.94 mole fractions S and MMA-CB copolymers made from feed of 0.34-0.88 mole fractions MMA were used to determine the monomer reactivity ratios r1 and r2. The structure of S-CB copolymers was inferred to be mainly of a random nature and in the MMA-CB copolymerization system there is a stronger tendency to form alternating copolymers. © 1993 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310619
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of HALS by hydrosilylation of vinyl monomers containing hindered amine (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 997-1000 
    Details
    ISSN: 0887-624X
    Keywords: hindered amine light stabilizer ; hydrosilylation ; functional monomer ; silane ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080320523
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetic studies on the cyclization of T7 and T1 DNA's (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 671-686 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rates of cyclization of two terminally repetitious phage DNA molecules, T7 and T1, were determined and compared with earlier studies of λ DNA. Though differing over 200-fold in the number of complementary nucleotides in the single-chain terminals, these three DNA's cyclize at about comparable rates, suggesting that excluded volume effects are significant. The first order rate constants for T7 and T1 are strictly dependent on solvent viscosity, consistent with a diffusion limitation of the rate determining step. Whole molecules with exposed single-chain terminals were shear-broken to half-molecules and the second order rate constants for joining were measured. The rates for T7 and T1 were nearly equivalent and some tenfold slower than predicted, suggesting that the long double-helical region appended to the renaturing regions and perhaps other undetermined factors retard the rate of joining of half-molecules.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150407
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    First-neighbor frequencies of satellite DNAs from Drosophila nasutoides and Pagurus pollicaris from an analysis of their circular dichroism spectra (1978)
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 107-114 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From an analysis of their circular dichroism spectra, we find that the four (A + T)-rich satellite DNAs of Drosophila nasutoides have distributions of first-neighbor base paris that resemble those previously found for other (A + T)-rich Drosophila satellites. We also apply our spectral analysis procedure for the first time to two (G + C)-rich satellite DNAs, those from the hermit crab Pagurus pollicaris. We find that P. pollicaris satellite I cannot be accurately analyzed with our standard set of spectral components and that P. pollicaris satellite II appears to be much like the synthetic polymer poly[d(A-G-C-)·d(G-C-T)] in its first-neighbor content.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1978.360170108
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of new hindered amine light stabilizers (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 403-409 
    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: New polymerizable urethane functional monomers containing hindered amine (III, III′) and their copolymers with styrene (S) and methyl methacrylate (MMA) are characterized and tested as hindered amine light stabilizers (HALS). Experimental results indicated that the monomers possess high photostabilizing effectiveness comparable to that of Tinuvin 770 and Tinuvin 765. Their copolymers with S and MMA showed lower photostabilizing effectiveness mainly due to the low hindered amine content in the copolymers. The copolymers, however, showed very high resistance to liquid extraction. UV and ESR analyses indicate that the photostabilizing mechanism of these HALS is through the scavenging action of nitroxyl radicals formed from degradation of the substrate polymer. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500304
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