Synthesis and Properties of Side Chain Liquid Crystalline Polyoxetanes (II)

• Main Authors: Lee, Ming-Kuang, 李明光
• Other Authors: Chang, Teh-Chou
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/44150736751359486190

碩士 === 中原大學 === 化學工程研究所 === 82 === In the first part of this study, 3-(hydroxymethyl)-3-methyl- oxetane (HMMO) was synthesizedas backbone monomer.Two mesogenic groups M1:4-methoxyphenyl-azo-4'-phenol , M2:4-methylphenylazo- 4'-phenol were attached through different spacer arms (n= 0, 6) on HMMO to obtain several oxetane derivatives.In the second part of this study, the polymers of these oxetane derivatives were synthesized by the cationic ring opening polymerization . The initiating system, BF3.OEt2/1,4-Butane diol(1/1) was used and it was shown that polymer of moderate molecular weight (5000-10000) were obtained by changing the feeding ratio of monomer vs. initiator. The copolymerization of oxetane derivatives with THF were investigated in order to study the influence of dilution of mesogenic group on liquid crystalline property. In the third part of this study. The hydroxy terminated side chain liquid crystalline polymer were polymerized and with 1,4-Butane diol as chain extender and diisocyanate(H12MDI) as crosslinking agent. The characteristic of elastomer and strong birefringence of the physical crosslinked polymer were observed under the thermal optical polarized microscope,and thermal properties of crosslinked polymers were studied by DSC measurements.