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  • 1
    Electronic Resource
    Electronic Resource
    Photoconductive properties of polysilane copolymers with pendant siloxane groups (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 675-677 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The oxygen durability of poly(methylphenylsilane) (PMPS) in photoconduction has been improved by the use of copolysilanes with disiloxane-pendant groups. X-ray photoelectron spectroscopy analysis shows that disiloxane groups of the copolysilanes accumulate on their top-most surface at a much higher concentration than the bulk disiloxane concentration. The preferential coverage of disiloxane groups on the surface evidently leads to formation of a highly oxygen durable surface. The hole drift mobility of the charge carriers in copolysilanes with 5 mol % of disiloxane-pendant groups is over 10−4 cm2 V−1 s−1 at E〉105 V cm−1, almost comparable to that of PMPS. It was noted that the practical Xerographic potential decay was stabilized by the copolysilanes, while PMPS deteriorated after oxygen exposure. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.127082
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  • 2
    Electronic Resource
    Electronic Resource
    Free radical copolymerization of allyloxyphenylsiloxanes with some vinyl monomers (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 215 (1994), S. 147-160 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 1-(p-Allyloxypheny1)-1,1,3,3,3-pentamethyldisiloxan (mono-APDS) und 1,3-Bis(p-allyloxyphenyl)-1,1,3,3-tetramethyldisiloxan(bis-APDS)wurden hergestellt und mit verschiedenen Vinylmonomeren (Styrol, Methylmethacrylat, N-Phenylmaleimid und Maleinsäaureanhydrid) radikalisch copolymerisiert. Die Reaktivitäaten der Allygruppen von mono-und bis-APDS sind bei den Copolymerisationen mit Styrol bzw. Methylmethacrylat etwa gleich und nehmen mit wachsender Elektronenakzeptorfäahigkeit des Comonomeren zu. Im Falle elektronenarmer Monomerer wie N-Phenylmaleimid und Maleinsäaureanhydrid findet äuber die zweite Allylfunktion von bis-APDS leicht eine Vernetzung statt. Untersuchungen mit Differentialkalorimetrie und Thermogravimetrie zeigten, daß in diesen Copolymeren eine Erhäohung des APDS-Anteils zu niedrigeren Glasumwandlungs-und häoheren Zersetzungstemperaturen führt.
    Notes: Two p-allyloxyphenyldisiloxane compounds, 1-(p-allyloxyphenyl)-1,1,3,3,3-pentamethyldisiloxane (mono-APDS) and 1,3-bis(p-allyloxyphenyl)-1,1,3,3-tetramethyldisiloxane (bis-APDS), were synthesized to study their radical copolymerizations with some vinyl monomers (styrene, methyl methacrylate, N-phenylmaleimide and maleic anhydride). The reactivities of allyl groups in mono-APDS and bis-APDS were found to be almost the same in styrene and methyl methacrylate copolymerization, as evidenced by their composition curves, and increase with the electron-accepting ability of comonomers. In the case of electron-poor monomers, such as N-phenylmaleimide and maleic anhydride, the second allyl group of bis-APDS readily took part in the crosslinking. Differential scanning calorimetry and thermogravimetry revealed that the increase of APDS contents in those copolymers led to lower glass transition temperature (Tg) and higher thermal degradation temperature.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052150113
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  • 3
    Electronic Resource
    Electronic Resource
    Discrimination of ethylene/vinyl acetate copolymers with different composition and prediction of the content of vinyl acetate in the copolymers and their melting points by near-infrared spectroscopy and chemometrics (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 1529-1537 
    Details
    ISSN: 0887-6266
    Keywords: near-infrared spectroscopy ; diffuse reflectance spectroscopy ; copolymer ; ethylene/vinyl acetate copolymer ; chemometrics ; multivariate data analysis ; principal component analysis ; partial least-squares regression ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Near-infrared (NIR) diffuse reflectance spectra have been measured by use of a rotating drawer for pellets of 12 kinds of ethylene/vinyl acetate (EVA) copolymers with vinyl acetate (VA, the comonomer) varying in the 7-44 wt % range. They are unambiguously discriminated from one another by a score plot of the principal component analysis (PCA) Factor 1 and 2, based upon the NIR spectra pretreated by multiplicative scatter correction (MSC). Principal component (PC) weight loadings for Factor 1 show that the discrimination relies largely upon bands due to the overtone and combination modes arising from the VA unit. We have found one “outlier” in the score plot and elucidated its spectral characteristics based upon PC weight loadings for Factor 2. Partial least-squares (PLS) regression has been applied to propose calibration models which predict the VA content in EVA. The models have been prepared for three kinds of pretreatment, the first derivative, the second derivative, and MSC; and four kinds of wavelength regions. The NIR spectra in the 1100-2200 nm region after the MSC treatment has given the best correlation coefficient and standard error of prediction (SEP) of 0.998 and 0.70%, respectively. The calibration models, prepared by NIR diffuse reflectance spectroscopy for the pellet samples, are compared with previously reported models by NIR transmission spectroscopy for the flowing molten samples, and with those by Raman spectroscopy for the pellet samples. PLS regression has also allowed us to predict melting points of the copolymers with the correlation coefficient and SEP of 0.997 and 0.78°C, respectively. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 1529-1537, 1998
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Surface characteristics of polydimethylsiloxane - poly(methyl methacrylate) block copolymers and their PMMA blends (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 1815-1829 
    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: To draw a relationship between surface concentration of the siloxane segment and adhesion performance, surface properties of the polydimethylsiloxane - poly(methyl methacrylate) block copolymers(PDMS-b-PMMA) prepared via poly(azo-containing siloxaneamide)s and their PMMA blends have been studied by measurements of FT-IR spectra, water contact angle, ESCA spectra and 180° peel strength toward pressure-sensitive adhesive tape. The water contact angles of the chloroform-cast blend films increased abruptly with siloxane bulk concentrations, or siloxane contents, particularly, on the air-side surfaces to reach almost 100° in low siloxane content. A marked increase of the contact angle was observed in the blends containing siloxane chain length (SCL) of longer than 2000. ESCA data evidently confirmed for these blend systems that the siloxane segments with low surface energy were accumulated or enriched mainly on the air-side surface, and that, on the other hand, polar PMMA segments with high surface energy were oriented to the glass-side surface and the inside of the films. This surface accumulation behavior of the siloxane segments reflected the 180° peel strength, as a measure of adhesion performance. The water contact angle and 180° peel strength were unequivocally correlated to the siloxane surface concentration estimated from ESCA data. Conversely, in the compression-molded blend films made by a hydraulic press between a Teflon and a stainless steel plate, the extent of surface accumulation of the PDMS segment was lower than that of the chloroform-cast films, suggesting lower degree of segment migration in hot-press films, probably due to substrate surface energy and lower relaxation in the blend melts.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070410737
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal crosslinking of chlorinated polydimethylsiloxane-poly(vinyl chloride) blends (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 363-368 
    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
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070460217
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  • 6
    Electronic Resource
    Electronic Resource
    Surface characteristics of fluoroalkylsilicone - poly(methyl methacrylate) block copolymers and their PMMA blends (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1917-1938 
    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: Surface properties of fluoroalkylsilicone - poly(methyl methacrylate) block copolymers and their poly(methyl methacrylate) (PMMA) blends have been intensively studied to draw a relationship between surface segregation behavior and adhesion performance. The fluoroalkylsilicone - PMMA block copolymers containing thre kinds of fluoroalkyl side chains (i.e., 3,3,3-trifluoropropyl) (CF3CH2CH2-, abbreviated as TFP), tridecafluoro-1,1,2,2-tetrahydrooctyl [F3C(CF2)5CH2CH2-, TFO], and heptadecafluoro-1,1,2,2-tetrahydrodecyl groups [F3C(CF2)7CH2CH2-, HFD] on the siloxane chains were prepared according to the macroazoinitiator method. Contact angle measurement and X-ray photoelectron spectroscopy (or ESCA) were used to obtain structural information on the surface of the solution-cast films. A significant effect of fluroalkyl groups on the surface accumulation not only in silicon but also fluorine atoms were observed for relatively long fluoroalkyl side chains (i.e., TFO and HFD). On the contrary, TFP group was found to be effective to orient to the hydrophilic surfaces (i.e. glass-side surfaces). The surface accumulation of fluoroalkyl groups in the films was also reflected by the 180° peel strength against pressure-sensitive adhesives as a measure of the adhesion performance. These results indicated that incorporation of relatively long fluoroalkyl groups much enchanced the surface hydrophobicity (and/or oleophobicity) of solution-cast films in addition to that of the siloxane-enriched surfaces. The composition and orientation of the functional groups on the surface were also speculated based on ESCA data.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070401110
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  • 7
    Electronic Resource
    Electronic Resource
    Crosslinking of chlorinated poly(dimethylsiloxanes) with thiol compounds (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 931-935 
    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
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070460520
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation and curing behavior of siloxane-containing epoxy resins (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2045-2048 
    Details
    ISSN: 0887-624X
    Keywords: siloxanes ; epoxy resins ; synthesis ; curing ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300931
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of aromatic polyester-siloxanes using 1,3-bis(p-hydroxyphenyl) disiloxanes as diol components (1990)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 28 (1990), S. 13-19 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1990.140280103
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  • 10
    Electronic Resource
    Electronic Resource
    Direct polycondensation of 4,4′-azobis-4-cyanopentanoic acid with diols and diamines using 1-methyl-2-chloropyridinium iodide (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 2107-2114 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyesters and polyamides derived from 4,4′-azobis-4-cyanopentanoic acid (ACPA) were prepared by the direct polycondensation using 1-methyl-2-chloropyridinium iodide (MCPI) as a condensation reagent at room temperature, in which the azo group was not decomposed. These polyesters and polyamides containing the azo groups could be used for effective initiators of radical polymerizations with some vinyl monomers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1990.080280808
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