Abstract

When the chalcone moiety and methylene spacers are bonded to polymer backbone, they are expected to incorporate photosensitive and liquid crystalline properties, respectively. The thermotropic side-chain liquid crystalline photosensitive polymers were synthesized using 4-phenyl styryl carbonyl (phenyl-4-oxy-4-hexyl) methacrylate (PSCPOHMA) and 4-phenyl styryl carbonyl (phenyl-4-oxy-4-decyl) methacrylate (PSCPODMA) monomers by free-radical polymerization using benzoyl peroxide (BPO) as an initiator. The structures of the synthesized monomers and polymers were confirmed by FT-IR, ¹H NMR and ¹³C NMR techniques. The thermal stability and glass transition temperature of the poly (PSCPOHMA) were higher than that of the poly (PSCPODMA). The photocrosslinking of the polymers on irradiation with UV light established that the polymers followed 2π + 2π cyclo addition. The rate of crosslinking increased with increase in the length of the methylene chain. The mesophase of the polymers was also characterized using x-ray diffraction analysis. The liquid crystalline behavior of the polymers was confirmed by DSC and Hot stage optical polarized microscopy (HOPM).The polymers exhibited nematic phase in HOPM. So the polymers have high potential for application in photo resists and electro optic technology.

摘要

当查尔酮部分和亚甲基间隔基键合到聚合物主链上时，它们有望分别具有光敏和液晶特性。使用 4-苯基苯乙烯基羰基（苯基-4-氧基-4-己基）甲基丙烯酸酯（PSCPOHMA）和 4-苯基苯乙烯基羰基（苯基-4-氧基-4-癸基）甲基丙烯酸酯合成热致侧链液晶光敏聚合物(PSCPODMA) 单体通过使用过氧化苯甲酰 (BPO) 作为引发剂的自由基聚合。合成的单体和聚合物的结构通过红外光谱、¹ H NMR和¹³C NMR 技术。聚 (PSCPOHMA) 的热稳定性和玻璃化转变温度高于聚 (PSCPODMA)。聚合物在紫外光照射下发生光交联，表明聚合物遵循 2π + 2π 环加成反应。交联速率随着亚甲基链长度的增加而增加。还使用 x 射线衍射分析对聚合物的中间相进行了表征。通过 DSC 和热台光学偏光显微镜 (HOPM) 证实了聚合物的液晶行为。聚合物在 HOPM 中呈现向列相。因此，该聚合物在光致抗蚀剂和电光技术中具有很高的应用潜力。