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Studies on the structure and properties of thermotropic liquid crystalline poly(aryl ether ketone)s
Zhang, SJ; Fu, LX; Yang, DC; Sun, H; Wang, GB; Wu, ZW
2001-02-01
Source PublicationCHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
ISSN0251-0790
Volume22Issue:2Pages:334-337
AbstractSeries of thermotropic liquid crystalline poly (aryl ether ketone) s were synthesized by mucleophilic substitution reactions of 4,4'-biphenol and substituted hydroquinone with different difluoromonomers, The relationship between structure and properties of the novel copolymers was investigated. For the copolymers with liquid crystalline properties, their melting transition temperatures show no great change with increase the content of the crystal-disrupting unit. The reason is that the crystal phase is directly transformed from the ordered liquid crystal phase. Side-groups have important effect on mesophase stability, The temperature range of mesophase stability for the chloro-polymers is smaller than those of other series of copolymers (P-phenyl, t-butyl, methoxy, 3-trifluoromethylbenzene). This behavior indicates that the effect of geometric repulsive factor on the thermodynamic stability of the mesophase is much larger than that of the polarizability attractive factor. Different ordered liquid crystal phases are observed in the polymers with different molecular weights. At low molecular weight, highly ordered smectic liquid crystal phases form. With increasing the molecular weight, the ordered degree of the liquid crystals decreases, and only the nematic liquid crystal phase is observed in the polymer with higher molecular weight.
KeywordPoly(Aryl Ether Ketone)s Liquid Crystalline Polymers Structure And Properties
Indexed BySCI
Language英语
WOS IDWOS:000167220600041
PublisherHIGHER EDUCATION PRESS
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/76878
Collection中国科学院化学研究所
Corresponding AuthorYang, DC
Affiliation1.Acad Sinica, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Jilin Univ, Dept Chem, Natl R&D Ctr Super Engn Plast, Changchun 130023, Peoples R China
Recommended Citation
GB/T 7714
Zhang, SJ,Fu, LX,Yang, DC,et al. Studies on the structure and properties of thermotropic liquid crystalline poly(aryl ether ketone)s[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2001,22(2):334-337.
APA Zhang, SJ,Fu, LX,Yang, DC,Sun, H,Wang, GB,&Wu, ZW.(2001).Studies on the structure and properties of thermotropic liquid crystalline poly(aryl ether ketone)s.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,22(2),334-337.
MLA Zhang, SJ,et al."Studies on the structure and properties of thermotropic liquid crystalline poly(aryl ether ketone)s".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 22.2(2001):334-337.
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