Influence of different linkage groups in biphenyl mesogenic core on   phase behaviors of mesogen-jacketed liquid crystalline polymers

doi:10.1002/pola.26662

CORC > 北京大学 > 工学院

	Influence of different linkage groups in biphenyl mesogenic core on phase behaviors of mesogen-jacketed liquid crystalline polymers
	Zhang, Lan-Ying ; Zhang, Yang-Fei
刊名	journal of polymer science part a polymer chemistry
	2013
关键词	biphenyl core different linkage group glass transition liquid-crystalline polymers (LCP) phase behavior SCANNING FORCE MICROSCOPY DENDRITIC SIDE-GROUPS MACROMOLECULAR COLUMNS BUILDING-BLOCKS CHAIN POLYMERS POLYMERIZATION POLYSILOXANES ARCHITECTURES MESOPHASE
DOI	10.1002/pola.26662
英文摘要	The work focuses on the design, synthesis, and characterization of a series of mesogen-jacketed liquid crystalline polymers (MJLCPs) based on the octyl substituted biphenyl mesogenic core through different linkage groups. The molecular characterizations of the polymers obtained by conventional free radical polymerization were performed with 1H NMR, gel permeation chromatography, and thermogravimetric analysis. Their thermotropic liquid crystalline (LC) behaviors were investigated in detail by a combination of various techniques, such as polarized light microscopy, differential scanning calorimetry, and 1D and 2D wide-angle X-ray diffraction. Our results showed that all the polymers were thermally stable, and their LC phases were greatly dependent on the linking groups between the biphenyl mesogenic core and terminal alkyl group substituent. Polymers with ether/ester or ether linkage group exhibited an unusual phase behavior with temperature increasing, tetragonal columnar nematic LC phase, or columnar nematic phase developed at high temperatures for the polymers transformed into amorphous phase during cooling process, showing a re-entrant phase behaviors. However, polymers with ester linkage group were not LC with temperature varied. It is illustrated that subtle changes in the molecular structure brought about tremendous variation of the LC phase properties for MJLCPs. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 25452554; Polymer Science; SCI(E); EI; 1; ARTICLE; 12; 2545-2554; 51
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/154465]
专题	工学院
推荐引用方式 GB/T 7714	Zhang, Lan-Ying,Zhang, Yang-Fei. Influence of different linkage groups in biphenyl mesogenic core on phase behaviors of mesogen-jacketed liquid crystalline polymers[J]. journal of polymer science part a polymer chemistry,2013.
APA	Zhang, Lan-Ying,&Zhang, Yang-Fei.(2013).Influence of different linkage groups in biphenyl mesogenic core on phase behaviors of mesogen-jacketed liquid crystalline polymers.journal of polymer science part a polymer chemistry.
MLA	Zhang, Lan-Ying,et al."Influence of different linkage groups in biphenyl mesogenic core on phase behaviors of mesogen-jacketed liquid crystalline polymers".journal of polymer science part a polymer chemistry (2013).