ISSN:
0887-624X
Keywords:
polyquinoline
;
liquid crystalline polymer
;
thermotropic
;
mechanical property
;
substituted polyquinoline
;
flexible groups
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Thermotropic liquid-crystalline polyquinolines with high molecular weights, i.e., poly[2,2′-(α,ω-dioxyphenylene (or -dioxybiphenylene) alkane)-6,6′-(4,4′-dioxybiphenyl)-bis(4-phenylquinoline)]s (P-H-B1Mns or P-H-B2Mns), were synthesized by polycondensation of 4,4′-bis(4-amino-3-benzoylphenoxy)biphenyl and α,ω-bis(4-acetophenoxy (or -acetobiphenoxy))alkanes. For P-H-B1Mn series, the Tm and Ti were in the range of 129-230°C and 156-254°C, respectively, while for the P-H-B2Mn series, those were 182-275°C and 217-309°C, respectively. The introduction of both the dioxybiphenylene group and an alkylene spacer induced thermotropic liquid crystallinity in the polyquinoline, although the introduction of the alkylene spacer alone did not induce it. In addition, polyquinolines substituted with methyl, methoxy, and chloro groups exhibited larger mesophase temperature ranges as well as higher Tms and Tis than the unsubstituted ones. Tensile strengths of these thermotropic polyquinolines were considerably high in the range of 770 to 1170 kgf/cm2. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 749-759, 1998
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
