摘要
以4-烯丙氧基苯甲酰氯和4-羟基联苯氰为原料,经缩合反应合成了一种新型的液晶基元4-烯丙氧基苯甲酸-4'-羟基联苯氰酯(2,产率71.6%);将2接枝到聚甲基氢硅氧烷的主链上合成了一种新型的香蕉型B1相聚硅氧烷侧链液晶(4,产率70.0%)。2和4的结构经1H NMR和FT-IR表征。用热台偏光显微镜(POM)和X-射线衍射仪(XRD)对2和4的液晶相类型和液晶相行为进行观察和分析;采用差示扫描量热法(DSC)和综合热分析法(TGA)对其热性能进行分析。结果表明,4的介晶区间为106.81℃,较2(82.50℃)有所提高;4在升降温过程中分别呈现出近晶A相和较特殊的香蕉型B1相织构。
A new liquid-crystalline monomer,4-allyloxy-benzoic acid-4＇-cyano-biphenol （2）,was prepared by condensation reaction of 4-allyloxy-benzoic acyl chloride with 4＇-cyano-biphenol.A novel type of side-chain liquid-crystalline polysiloxane（4） in yield of 70.0% was synthesized by graft polymerization of 2 with polymethyl hydrogen siloxane.The structures of 2 and 4 were characterized by 1 H NMR and FT-IR.The liquid crystalline phase type of 2 and 4 were observed by polarizing optical microscopy（POM） and X-ray diffraction （XRD）.The liquid crystalline phase behavior and thermo properties of 2 and 4 were analyzed by differential scanning calorimetry （DSC） and thermal gravimetric analyzer（TGA）.The results showed that the mesophase temperature range（106.81℃） of 4 was broader than 2（82.50 ℃）.Meanwhile,4 exhibited a smectic A phase texture and banana B1 phase texture during the heating and cooling cycle,respectively.
出处
《合成化学》
CAS
CSCD
北大核心
2014年第4期448-452,共5页
Chinese Journal of Synthetic Chemistry
基金
2013年陕西省教育厅科研计划资助项目(2013JK0920)
2011年陕西省科技统筹创新工程计划战略性新兴产业重大产品(群)项目(2011KTCQ01-36)
关键词
聚硅氧烷
侧链液晶聚合物
香蕉型B1相
合成
液晶性能
polysiloxane
side-chain liquid crystalline polymer
banana B1 phase
synthesis
liquid crystal property
