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首页> 美国政府科技报告 >Transformation of a Monotropic Mesophase into an Enantiotropic Mesophase by Copolymerization of the Parent Polymers' Monomer Pair Containing Constitutional Isomeric Mesogenic Side Groups
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Transformation of a Monotropic Mesophase into an Enantiotropic Mesophase by Copolymerization of the Parent Polymers' Monomer Pair Containing Constitutional Isomeric Mesogenic Side Groups

机译：通过含有结构异构中间体侧基的母体聚合物单体对的共聚合将单向中间相转化为对映体中间相

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The synthesis and the mesomorphic behavior of poly(methylsiloxane)s containing 4-methoxy-4'-hydroxy-trans-alpha-methylstilbene (4-n-PS) and 4-hydroxy-4'-methoxy-trans-alpha-methylstilbene (4'-n-PS) connected to the backbone by flexible spacers containing three, six and eleven (n = 3, 6, 11) methylene units, and of some copolymers based on these two constitutional isomeric mesogenic side groups (4,4' (A/B)-n-coPS) is described. The copolymers derived from structural units whose homopolymers displayed enantiotropic mesophases (4,4'(A/B)-3-coPS and 4,4' (A/B)-11-coPS) exhibited a depression of both mesomorphic and crystalline phase transition temperatures. However, the 4,4' (50/50)-6-coPS copolymers, derived from structural units whose homopolymers (4-6-PS and 4'-6-PS) displayed nematic monotropic mesophases, exhibited an enantiotropic nematic mesophase. Liquid crystal polymers, Monotropic, Enantiotropic. (jes)

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