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首页> 外文期刊>Journal of Materials Science >CHARACTERIZATION OF SIDE-CHAIN LIQUID CRYSTAL POLYMERS USING DYNAMIC MECHANICAL THERMAL ANALYSIS AND DIELECTRIC THERMAL ANALYSIS
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CHARACTERIZATION OF SIDE-CHAIN LIQUID CRYSTAL POLYMERS USING DYNAMIC MECHANICAL THERMAL ANALYSIS AND DIELECTRIC THERMAL ANALYSIS

机译:力学热分析和介电热分析表征侧链液晶聚合物

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摘要

Ten members of a homologous series of side-chain liquid crystal polymers, the poly[[alpha-(4-methoxybiphenylyl-4'-oxy)-omega 3-alkyl]methacrylate]s, have been characterized using dynamic mechanical thermal analysis (DMTA) and dielectric thermal analysis (DETA). For the undecyl and dodecyl homologues both techniques revealed a smectic-smectic transition not detected in previous studies either by differential scanning calorimetry or by optical microscopy. It is proposed that this corresponds to a monolayer-bilayer smectic A transition. A weak transition at ca. - 30 degrees C is detected using DMTA for polymers with spacer lengths 4-8 and by analogy with poly(methyl methacrylate) may indicate the absorption of small amounts of water. DMTA also proved to be particularly effective in deconvoluting transitions and for the propyl homologue established the existence of a smectic phase suggested by optical microscopy. [References: 14]
机译:使用动态机械热分析(DMTA)表征了一系列同源的侧链液晶聚合物的十个成员,即[[[α-(4-甲氧基联苯基-4'-氧基)-ω3-烷基]甲基丙烯酸酯] )和介电热分析(DETA)。对于十一烷基和十二烷基同系物,两种技术均揭示了在先前的研究中通过差示扫描量热法或光学显微镜未检测到的近晶-近晶转变。提出这对应于单层-双层近晶A转变。约有一个弱过渡。 -对于间隔长度为4-8的聚合物,使用DMTA检测到30摄氏度,并且与聚(甲基丙烯酸甲酯)类似,可能表明吸收了少量的水。 DMTA还被证明在去卷积过渡中特别有效,并且对于丙基同系物,光学显微镜表明存在近晶相。 [参考:14]

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