Studies on the Synthesis and Properties of Side Chain Crosslinkable Thermotropic Liquid Crystalline Polymer and its Elastomers(Ⅱ)

• Main Authors: Chung Shing Long, 鍾新龍
• Other Authors: Chang Teh-Chou
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/92519366537418135025

碩士 === 中原大學 === 化學工程學系 === 87 === In the first part of this study, a diamine monomer, (2,2’-diacryloyl-4,4’-diaminobiphenyl), containing crosslinkable and mesogen functional group was synthesized using 2-2’-diacryloyl-4,4’-dinitrobiphenyl as the starting material by various kind of reduction methods. In order to investigate the influence of the reduction methods on the yield and structure of diamine monomer, the reduction products were analyzed and identified by FTIR, NMR and elemetal analysis. The nitro functional group reduced into amine group by using calcium chloride mixing with iron powder and hydrochloric acid containing iron powder as the reduction agents would not reduce carbon-carbon double bond simultaneously. However, by using others reduction agents, the carbon-carbon double would be reduced with nitro group at the same time. In the second part, the diamine monomer synthesized by using hydrochloric acid and iron powder as the reduction agent reacted with various diacids, diols, and aromatic acids, which contain hydroxy group in one end and carboxyl group in the other end, were polymerized by using direct polycodensation to obtain a series of side chain crosslinkable aromatic poly(amide-ester)s. In order to investigate the effect of the kind of monomer and its structure on the thermal properties of obtained polymer, the obtained polymers were measured by DSC, TGA, and polarized microscope with a heating stage. The polymer synthesized by introducing of PEG4 diacid monomer which containing flexible spacer possessed lower melting point and higher inherent viscosity than those of polymers synthesized from TPA, IPA, and NAAC diacid monomers. Furthermore, except polymer 3a, all of the polymers did not exhibt thermotropic liquid crystalline properties.