Synthesis and properties of polyacetylenes containing bis(4-alkylphenyl)terephthalate as pendant and methyleneoxy as spacer

doi:10.1016/j.synthmet.2009.05.001

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	Synthesis and properties of polyacetylenes containing bis(4-alkylphenyl)terephthalate as pendant and methyleneoxy as spacer
	Chen, Yiwang 1,2; Chen, Lie 1; Zhou, Weihua 1; Zha, Daijun 2; Zhou, Dan 2; Bai, Fenglian 3; Wan, Meixiang 3
刊名	SYNTHETIC METALS
	2009-08-01
卷号	159 期号:15-16 页码:1649-1656
关键词	Polyacetylene Liquid Crystals Conjugated Polymers
ISSN号	0379-6779
DOI	10.1016/j.synthmet.2009.05.001
英文摘要	Monosubstituted polyacetylenes containing lateral pendants of bis(p-alkylphenyl)terephthalate with spacer and alkyl tails [R, where R is H, CH(3) and C(3)H(7)] were synthesized, and the effects of the backbone structure and alkyl tails on the properties were investigated. The monomer with alkyl tails (p-methyl and p-propyl) formed a smectic mesophase upon heating above the melting temperature, but the other one without tails could not exhibit liquid crystallinity at elevated temperatures. The lower melting temperature and wider mesomorphic temperature range of 2-propargyloxy-bis(p-propylphenyl)terephthalate (k 91.6 SmB 102.6 i) than 2-propargyloxy-bis(p-methylphenyl)terephthalate (k 134.3 SmB 143.7 i) indicated that the long tail in mesogen played an important role in the packing order and stability of their liquid crystalline phase. The polymerization of acetylene monomers were carried out with [Rh(nbd)Cl](2) as a catalyst in toluene. The structures and properties of the monosubstituted polyacetylenes were characterized by the means of nuclear magnetic resonance. polarized optical microscopy, infrared spectroscopy, ultraviolet spectroscopy, photoluminescence, thermogravimetry and differential scanning calorimetry. The molecular weights of the polymers were measured by gel permeation chromatograph. The polymers could not exhibit liquid crystallinity at elevated temperatures. The steric effect of bulky liquid-crystallinity mesogens prevented the coplanar conformation of the polyene backbone, and thus, led to the lower absorption and emission of the polymers. (C) 2009 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000269470200022
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/65909]
专题	中国科学院化学研究所
通讯作者	Chen, Yiwang
作者单位	1.Nanchang Univ, Inst Polymers, Nanchang 330031, Peoples R China 2.Nanchang Univ, Dept Chem, Nanchang 330031, Peoples R China 3.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Key Lab Organ Solids, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Chen, Yiwang,Chen, Lie,Zhou, Weihua,et al. Synthesis and properties of polyacetylenes containing bis(4-alkylphenyl)terephthalate as pendant and methyleneoxy as spacer[J]. SYNTHETIC METALS,2009,159(15-16):1649-1656.
APA	Chen, Yiwang.,Chen, Lie.,Zhou, Weihua.,Zha, Daijun.,Zhou, Dan.,...&Wan, Meixiang.(2009).Synthesis and properties of polyacetylenes containing bis(4-alkylphenyl)terephthalate as pendant and methyleneoxy as spacer.SYNTHETIC METALS,159(15-16),1649-1656.
MLA	Chen, Yiwang,et al."Synthesis and properties of polyacetylenes containing bis(4-alkylphenyl)terephthalate as pendant and methyleneoxy as spacer".SYNTHETIC METALS 159.15-16(2009):1649-1656.