Synthesis and Liquid Crystalline Properties of New Thermotropic Polyurethanes
β Scribed by Lian, Yanqing; Li, Mingqi; Zhan, Jun; Zhou, Qixiang; Liu, Deshan
- Book ID
- 125805679
- Publisher
- Nature Publishing Group
- Year
- 1999
- Tongue
- English
- Weight
- 828 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0032-3896
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Six series of polycarbonates with flexible spacers have been prepared by melt condensation of aromatic diols such as 4,4'-bis[(2-hydroxyethyl)oxy]biphenyl, 4,4'-bis[(6-hydroxyhexyl)oxy]biphenyl, 1,5-bis[(2-hydroxyethyl)oxy]naphthalene, 1,5-bis[(6-hydroxyhexyl)oxy]naphthalene, 2,6bis[2-hydroxyethyl)o
Thermotropic liquid-crystalline polyquinolines with high molecular weights, i.e., poly[2,2 -(a,v-dioxyphenylene (or -dioxybiphenylene) alkane)-6,6 -(4,4dioxybiphenyl)-bis(4-phenylquinoline)]s (P-H-B1Mns or P-H-B2Mns), were synthesized by polycondensation of 4,4 -bis(4-amino-3-benzoylphenoxy)biphenyl
Novel type of mesogenic chain extenders used in this study are N,NΠ-bis(4hydroxyphenyl)-3,4,3Π,4Π-biphenyldicarboxyimide (BPDI) and N, NΠ-bis[4-(6-hydroxyhexyloxy) phenyl]-3,4,3Π,4Π-biphenyldicarboxyimide (BHDI). BHDI has a flexible spacer of 6-methylene units but BPDI does not. The liquid crystalli