SYNTHESIS AND CHARACTERIZATION OF A RODLIKE LIQUID CRYSTALLINE POLYURETHANE OLIGOMER

Autor:	Xue-Mei Xiong, Qiu-Shan Gao, Xin Shen, Yongyang Gong, Chun Wei
Rok vydání:	2010
Předmět:	Materials science Thermal decomposition Thermotropic crystal Oligomer chemistry.chemical_compound Crystallinity Chemical engineering chemistry Liquid crystal Phase (matter) Polymer chemistry Melting point General Materials Science Polyurethane
Zdroj:	Functional Materials Letters. :169-172
ISSN:	1793-7213 1793-6047
DOI:	10.1142/s1793604710001172
Popis:	A novel rodlike liquid crystalline polyurethane (LCPU) oligomer was synthesized by polyaddition of hexane-1,6-diylbis(4-hydroxybenzoate) with toluene 2,4-diissocyanate in N, N′-dimethylformamide solution. The properties of the LCPU oligomer were investigated by FT-IR, DSC, TGA, POM, WAXD and SEM. The LCPU oligomer was a yellow powder at room temperature, which maintained a stable rodlike microstructure below its melting point, and had high crystallinity. The LCPU oligomer exhibited thermotropic liquid crystalline properties between 166–183°C, and the smectic-A phase with focal conic fan textures at the liquid crystal state was observed by POM. The decomposition temperature of the LCPU oligomer at 5% weight loss was 282°C.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5b1034d0878f8eb8c4683d0e46190e54 https://doi.org/10.1142/s1793604710001172 Zobrazit plný text záznamu