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Synthesis and phase structures of mesogen-jacketed liquid crystalline polymers containing 1,3,4-oxadiazole based side chains
Chai, Chun-Peng1,2; Zhu, Xing-Qi1; Wang, Ping1; Ren, Min-Qiao1; Chen, Xiao-Fang1; Xu, Yi-Ding1; Fan, Xing-He1; Ye, Chun1; Chen, Er-Qiang1; Zhou, Qi-Feng1
2007-12-25
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume40Issue:26Pages:9361-9370
AbstractA series of new monomers of 2,5-bis[(4-tertbutyl-phenyl)-1,3,4-oxadiazole] styrene (M-Ct) and 2,5-bis[(4-alkoxy-phenyl)-1,3,4-oxadiazole] styrene (M-OCm, m is the number of the carbons in the alkoxy groups, m = 8, 10, 12, 14) were synthesized. Conventional radical polymerization of the monomers resulted in a series of new mesogen-jacketed liquid crystalline polymer (MJLCP) containing the 1,3,4-oxadiazole unit. The chemical structures of the monomers were confirmed by elemental analysis, mass spectrometry, H-1 NMR, and IR. The molecular characterization of the corresponding polymers of P-Ct and P-OCms was performed with H-1 NMR, gel permeation chromatography, and thermogravimetric analysis. Their phase structures and transitions were investigated by differential scanning calorimetry, wide-angle X-ray diffraction, and polarized light microscopy experiments. The P-Ct formed the hexatic columnar nematic (phi(HN)) phase that is typical for MJLCPs, wherein the chain molecules were rodlike. The P-OCms exhibited a well-defined smectic A (S-A) phase. As the mesogenic group is laterally jacketed to the polyethylene backbone through a single carbon-carbon bond, the P-OCm. molecule in the SA phase Should be more or less ribbonlike with the backbone squeezed by the parallel aligned side chains on both sides. The transition of the four P-OCms follows the sequence of SA <-> N <-> I. The comparison between P-Ct and P-OCms indicates that the flexibility of the side-chain tails is crucial to determine the LC structures. Namely, simply changing the chemical structures of small portion of the MJLCP may greatly vary the molecular packing behavior and thus the molecular shape in LC phase structures.
DOI10.1021/ma071670t
Indexed BySCI
Language英语
WOS IDWOS:000251724700023
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:62[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/62724
Collection中国科学院化学研究所
Corresponding AuthorFan, Xing-He
Affiliation1.Peking Univ, Coll Chem & Mol Engn, Minist Educ, Beijing Natl Lab Mol Sci,Key Lab Polymer Chem & P, Beijing 100871, Peoples R China
2.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Chai, Chun-Peng,Zhu, Xing-Qi,Wang, Ping,et al. Synthesis and phase structures of mesogen-jacketed liquid crystalline polymers containing 1,3,4-oxadiazole based side chains[J]. MACROMOLECULES,2007,40(26):9361-9370.
APA Chai, Chun-Peng.,Zhu, Xing-Qi.,Wang, Ping.,Ren, Min-Qiao.,Chen, Xiao-Fang.,...&Zhou, Qi-Feng.(2007).Synthesis and phase structures of mesogen-jacketed liquid crystalline polymers containing 1,3,4-oxadiazole based side chains.MACROMOLECULES,40(26),9361-9370.
MLA Chai, Chun-Peng,et al."Synthesis and phase structures of mesogen-jacketed liquid crystalline polymers containing 1,3,4-oxadiazole based side chains".MACROMOLECULES 40.26(2007):9361-9370.
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