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ABA type triblock copolymer based on mesogen-jacketed liquid crystalline polymer: Design, synthesis, and potential as thermoplastic elastomer
Yi, Y; Fan, XH; Wan, XH; Li, L; Zhao, N; Chen, XF; Xu, J; Zhou, QF
2004-10-05
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume37Issue:20Pages:7610-7618
AbstractWe have designed and successfully prepared a well-defined ABA type triblock copolymer consisting of poly(n-butyl acrylate) as soft B block and poly{2,5-bis[(4-methoxyphenyl)oxycarbonyl]styrene} (PMPCS) as hard A block with potential as liquid crystalline thermoplastic elastomer (LCTPE). The synthetic strategy is to obtain a difunctional poly(n-butyl acrylate) first and then use it as a macroinitiator for chain extension. Both steps employ atom transfer radical polymerization (ATRP). Kinetic study of the chain-extension polymerization demonstrates a well-controlled process. The resulted triblock copolymers have high molecular weights (M(n) > 70 000) and low molecular weight distributions (M(w)/M(n) < 1.2). Their chemical structures are confirmed by nuclear magnetic resonance. Curves of differential scanning calorimetry indicate the immiscibility of the two components. Morphological investigations were made with transmission electrical microscopy and gave direct evidence of the existence of nanophase-separated structures with long-range order. After examinations by polarized optical microscopy, we found the triblock copolymers are LC only if the molecular weight of PMPCS block exceeds 20 000. Wide-angle X-ray diffraction measurements indicate a very stable nematic phase between glass transition of PMPCS block and decomposition. We found three samples are elastomeric. Preliminary mechanical tests were done on their films. Typical dynamic mechanical analysis and tensile tests prove that the sample has the potential as thermoplastic elastomers (TPEs). According to our best knowledge, the unique triblock copolymer is the first reported well-defined ABA type TPE imparting liquid crystallinity to the hard domains which serve as "physical cross-links". Since the novel LC block copolymer has the rod-coil-rod conformation, it is also a new type of elastic rod-coil block copolymer.
DOI10.1021/ma0400463
Indexed BySCI
Language英语
WOS IDWOS:000224197500025
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82458
Collection中国科学院化学研究所
Corresponding AuthorZhou, QF
Affiliation1.Peking Univ, Coll Chem & Mol Engn, Dept Polymer Sci & Engn, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Yi, Y,Fan, XH,Wan, XH,et al. ABA type triblock copolymer based on mesogen-jacketed liquid crystalline polymer: Design, synthesis, and potential as thermoplastic elastomer[J]. MACROMOLECULES,2004,37(20):7610-7618.
APA Yi, Y.,Fan, XH.,Wan, XH.,Li, L.,Zhao, N.,...&Zhou, QF.(2004).ABA type triblock copolymer based on mesogen-jacketed liquid crystalline polymer: Design, synthesis, and potential as thermoplastic elastomer.MACROMOLECULES,37(20),7610-7618.
MLA Yi, Y,et al."ABA type triblock copolymer based on mesogen-jacketed liquid crystalline polymer: Design, synthesis, and potential as thermoplastic elastomer".MACROMOLECULES 37.20(2004):7610-7618.
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