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  • Polymer and Materials Science  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Glass transition temperatures in blends of poly(N-vinyl-2-pyrrolidone) with a copolymer of bisphenol A and epichlorohydrin or with poly(vinyl butyral) (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1761-1766 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Blends of poly(vinyl butyral) (PVB) and of a copolymer of bisphenol A and epichlorohydrin (Phenoxy) with poly(N-vinyl-2-pyrrolidone) (PVP) were prepared by solution casting. The glass transition temperatures Tg for different compositions of the blends were measured by differential scanning calorimetry (DSC). The Tg behaviour of PVB/PVP blends suggests the existence of a single phase for blends containing less than 50 wt.-% PVP, and of two phases in blends containing more than 50 wt.-% PVP. Phenoxy/PVP blends showed to be miscible over the entire composition range. It was found that the Gordon-Taylor equation predicts adequately the Tg-composition dependence with a K parameter equal to 0,5 and 1,25 for PVB/PVP and Phenoxy/PVP blends, respectively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850822
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  • 2
    Electronic Resource
    Electronic Resource
    Miscibility of mixtures from partially hydrolyzed poly(vinyl acetate) and poly(N-vinyl-2-pyrrolidone) (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2439-2444 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymers with different compositions of vinyl alcohol and vinyl acetate units (P(VA-VAc)), obtained by alcoholysis of poly(vinyl acetate) with sodium methoxide, were mixed with poly(N-vinyl-2-pyrrolidone) (PVP). The miscibility was studied observing glass transition temperatures by differential scanning calorimetry (DSC). The calorimetric results indicate that for vinyl alcohol unit contents in P(VA-VAc) of roughly 70 wt.-% or more, P(VA-VAc)/PVP blends are fully miscible, whereas blends obtained from P(VA-VAc) with vinyl alcohol contents lower than the above mentioned values are only partially miscible or even immiscible. The miscibility is attributed to hydrogen bond interactions between hydroxyl groups in P(VA-VAc) and the carbonyl group of PVP.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021871015
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  • 3
    Electronic Resource
    Electronic Resource
    Miscibility in blends of polycarbonate and an aromatic polyester (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1741-1747 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Blends of the polycarbonate of bisphenol-A (PC) with polyacrylate (PA), an aromatic polyester formed from bisphenol A and terephthalic acid/isophthalic acid, were prepared by both melt and solution casting, and their transitional behaviour was examined by differential scanning calorimetry (DSC) and thermo-optical analysis (TOA). Each blend composition was found to have a single glass transition temperature by DSC and by TOA. This result suggests that polycaronate and polyarylate form blends containing a single amorphous phase. Ester-carbonate interchange reactions during melt-mixing were experimentally found to be unimportant. Melting point depression was used to estimate the blend interaction parameter χ12.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840817
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