Autor:	Yingfeng Tu, Qi-Feng Zhou, Xinhua Wan, Hailiang Zhang, E. M. Woo
Rok vydání:	2002
Předmět:	Materials science Polymers and Plastics Atom-transfer radical-polymerization Mesogen Organic Chemistry Dispersity Styrene Crystallography chemistry.chemical_compound Differential scanning calorimetry chemistry Polymer chemistry Materials Chemistry Copolymer Polystyrene Glass transition
Zdroj:	Journal of Polymer Research. 9:11-15
ISSN:	1022-9760
DOI:	10.1023/a:1020660230497
Popis:	The synthesis of a series of new rod-coil diblock copolymers with different molecular weights and low polydispersity was achieved by atom transfer radical polymerization. The block architecture (coil-conformation of styrene segment and rigid-rod conformation of 2,5-bis[(4-methoxyphenyl)-oxycarbonyl]styrene segment) of the diblock copolymers was experimentally confirmed by proton nuclear magnetic resonance ( 1 H NMR) and differential scanning calorimetry (DSC). The liquid crystalline behavior of the copolymers was studied using DSC and a polarized optical microscope (POM). It was found that the liquid crystalline behavior was dependent on the molecular-weight of the rigid segment. Only those copolymers with Mn of the rigid block beyond 9,300 g/mol could form liquid crystalline phases above the glass transition temperature of the rigid block.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::97f8cbbfb3313790f975e0c2cd873798 https://doi.org/10.1023/a:1020660230497 Zobrazit plný text záznamu Full text from SpringerLink