ICCAS OpenIR
Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic Pendants Leading to Thermotropic Liquid Crystalline Property
Mei, Xue; Chu, Yang; Cui, Jiaxi; Shen, Zhihao; Wan, Xinhua
2010-11-09
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume43Issue:21Pages:8942-8949
AbstractNonmesogenic cyclic alkylidene terephthalate is directly connected to flexible polyethylene main chain at every second carbon atom via the phenyl ring to obtain a novel vinyl polymer, poly(alkylidene vinylterephthalate) (PAVT-n), where n (= 10-14 and 16) denotes the number of methylene groups in the side chain. When the molecular weight is large enough, stable hexagonal columnar phases are generated from melt by the PAVT-n polymers with n = 10-13, but not by those containing 14 or 16 methylene groups. Compared with its open-ring counterpart, i.e., poly(dialkyl vinylterephthalate) (PDAVT-n) with linear side chains, PAVT-n has a glass transition temperature (T(g)) over 100 degrees C higher, a much larger persistence length, and a much lower critical molecular weight to form a mesophase. In addition, PDAVT-n enters into isotropic liquid at T(g) and becomes ordered at temperatures well above T(g), whereas PAVT-n forms mesophases immediately above T(g). The strong steric interaction between cyclic pendants and the flexible main chain, which causes PAVT-n to take an extended chain conformation, is considered as the main driving force for PAVT-n to generate mesophases. In a sharp contrast, the mesophase formation of PDAVT-n is known to be an entropy-driven process.
DOI10.1021/ma101728w
Indexed BySCI
Language英语
WOS IDWOS:000283693500033
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/69420
Collection中国科学院化学研究所
Corresponding AuthorShen, Zhihao
AffiliationPeking Univ, Beijing Natl Lab Mol Sci, Key Lab Polymer Chem & Phys MOE, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Mei, Xue,Chu, Yang,Cui, Jiaxi,et al. Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic Pendants Leading to Thermotropic Liquid Crystalline Property[J]. MACROMOLECULES,2010,43(21):8942-8949.
APA Mei, Xue,Chu, Yang,Cui, Jiaxi,Shen, Zhihao,&Wan, Xinhua.(2010).Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic Pendants Leading to Thermotropic Liquid Crystalline Property.MACROMOLECULES,43(21),8942-8949.
MLA Mei, Xue,et al."Steric Interaction between Flexible Main Chain and Nonmesogenic Cyclic Pendants Leading to Thermotropic Liquid Crystalline Property".MACROMOLECULES 43.21(2010):8942-8949.
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