含苯甲醚基团的高分子液晶的合成及表征

The Synthesis and Characterization of Liquid Crystalline Polymers Containing Benzyl Ether Mesogen

本文讨论了侧链含有亚甲氧基连接基高分子液晶的合成及表征.用酚类与苯甲基氯制备了六种单体,用硅氢加成法合成了高分子液晶.六种单体为:4 (4 烯丙氧基苯甲氧基)联苯(M1),4′ 甲氧苯基 4 烯丙氧基苯甲醚(M2),4′ 甲苯基 4 烯丙氧基苯甲醚(M3),苯基 4 烯丙氧基苯甲醚(M4),4 (4 烯丙氧基苯甲氧基) 4′ 甲氧基联苯(M5),4 (4 甲氧基苯甲氧基) 4′ 烯丙氧基联苯(M6).用偏光显微镜和DSC测定了单体和高分子液晶的相转变温度和介晶范围,单体M5和M6显示较好的液晶性,聚合物PM1、PM5、PM6、P(M2-M5)和P(M2-M6)显示出较好的液晶性,共聚物液晶比其它高分子液晶的介晶范围宽.

Liquid crystalline polysiloxanes were synthesized by hydrosilation of 4(4allyloxybenzyloxy)biphenyl(M1), 4allyloxybenzyl4′methoxyphenyl (M2), 4allyloxybenzyl4′methylphenyl(M3), 4allyloxybenzylphenyl(M4), 4(4allyloxybenzyloxy)4′methoxybiphenyl(M5), 4(4methoxybenzyloxy)4′allyloxybiphenyl(M6), M2—M5 and M2—M6. The phase behavior of monomeric and polymeric liquid crystals was characterized by differential scanning calorimetry and optical polarization microscopy. M6, PM1, PM5, PM6, P(M2—M5) and P(M2—M6) exhibit liquid crystal behaviors. 