Copolymerization of 2,6‐dimethoxy‐ and 2,6‐dimethylphenol and effect of the copolymer structure on the thermodynamic properties in the solid state
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<jats:title>Abstract</jats:title><jats:p>2,6‐Dimethoxyphenol and 2,6‐dimethylphenol have been copolymerized using the Ag<jats:sub>2</jats:sub>O‐triethylamine complex as catalyst. The products are random copolymers with wide molar mass distributions, M̄<jats:sub>w</jats:sub>/M̄<jats:sub>n</jats:sub> from 2.3 to 3.5. The larger size of the methoxy group than that of the methyl group has no effect on the reaction rate.</jats:p><jats:p>The heat capacities of the copolymers can be calculated from the values of the homopolymers to an accuracy of within ± 1% from 160 to 280 K.</jats:p><jats:p>ΔC<jats:sub>p</jats:sub> at T<jats:sub>g</jats:sub> for the copolymers changes linearly from the value of poly(oxy‐2,6‐dimethoxy‐1,4‐phenylene) to that of poly(oxy‐2,6‐dimethyl‐1,4‐phenylene) and the glass transition temperatures of the copolymers can be described by the equation of Couchman: <jats:disp-formula> </jats:disp-formula> <jats:styled-content>\documentclass{article}\pagestyle{empty}\begin{document}$${\rm K} = \Delta {\rm C}_{{\rm p} 2} / \Delta {\rm C}_{{\rm p} 1}.$$\end{document}<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-ueqn-2.gif" xlink:title="equation image" /></jats:styled-content></jats:p>
収録刊行物
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- Die Angewandte Makromolekulare Chemie
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Die Angewandte Makromolekulare Chemie 104 (1), 107-115, 1982-04-16
Wiley