Packing mode and conformational transition of alkyl side chains in   N-alkylated poly(p-benzamide) comb-like polymer

doi:10.1016/j.polymer.2004.07.005

CORC > 北京大学 > 化学与分子工程学院

	Packing mode and conformational transition of alkyl side chains in N-alkylated poly(p-benzamide) comb-like polymer
	Shi, HF ; Ying, Z ; Zhang, XQ ; Yong, Z ; Xu, YZ ; Zhou, SR ; Wang, DJ ; Han, CC ; Xu, DF
刊名	polymer
	2004
关键词	N-alkylated poly(p-benzamide) crystallization conformational transition RIGID-ROD POLYMERS PHASE-BEHAVIOR POLY(P-PHENYLENE TEREPHTHALAMIDE) POLYAMIDES POLYAZOMETHINES PARAFFINS
DOI	10.1016/j.polymer.2004.07.005
英文摘要	A series of rigid-rod poly(p-benzamide) polymers (PBA) with different length of flexible alkyl side chains, denoted as PBA(n)Cs, have been prepared by N-alkylation method. The alkyl side chain lengths varied from decyl (n = 10) to octadecyl (n = 18), with an interval of two carbon atoms. The packing mode and conformational transition of the alkyl side chains of the prepared PBA derivatives were characterized by wide-angle X-ray diffraction (WAXD), differential scanning calorimertry (DSC), and Fourier transform infrared spectroscopy (FTIR). WAXD results revealed that the derivatives form layered structure in which the distance between the backbones depends on the length of alkyl side chains. DSC studies indicated that melting transition temperature of PBA(n)Cs increases accordingly with increasing the alkyl chain length of the substituents. Meanwhile, DSC results proved that as the carbon atom number of the side group exceeds 14, alkyl side chains in PBA(n)Cs tend to crystallize FTIR spectroscopic investigation showed that the all-trans zigzag conformation is the most stable state for the alkyl side chain in PBA18C comb-like polymer. Temperature variation caused the reversible transition between trans and gauche conformational states of the side octadecyl group, and in turn made the molecular chain packing mode of PBA18C comb-like polymer undergo an reversible transformation from ordered packing to disordered packing. (C) 2004 Elsevier Ltd. All rights reserved.; Polymer Science; SCI(E); EI; 0; ARTICLE; 18; 6299-6307; 45
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/254644]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Shi, HF,Ying, Z,Zhang, XQ,et al. Packing mode and conformational transition of alkyl side chains in N-alkylated poly(p-benzamide) comb-like polymer[J]. polymer,2004.
APA	Shi, HF.,Ying, Z.,Zhang, XQ.,Yong, Z.,Xu, YZ.,...&Xu, DF.(2004).Packing mode and conformational transition of alkyl side chains in N-alkylated poly(p-benzamide) comb-like polymer.polymer.
MLA	Shi, HF,et al."Packing mode and conformational transition of alkyl side chains in N-alkylated poly(p-benzamide) comb-like polymer".polymer (2004).