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A novel phosphorus‐containing thermotropic liquid crystalline poly(ester‐imide) with high flame retardancy
Author(s) -
Yang Mi,
Chen Li,
Zhao ChengShou,
Huang HengZhen,
Wang JunSheng,
Wang YuZhong
Publication year - 2009
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1237
Subject(s) - thermotropic crystal , materials science , thermogravimetric analysis , differential scanning calorimetry , thermal stability , glass transition , limiting oxygen index , mesophase , polymer chemistry , magic angle spinning , fourier transform infrared spectroscopy , condensation polymer , liquid crystal , organic chemistry , chemical engineering , nuclear magnetic resonance spectroscopy , composite material , polymer , chemistry , char , pyrolysis , liquid crystalline , physics , optoelectronics , engineering , thermodynamics
A novel phosphorus–nitrogen thermotropic liquid crystalline poly(ester‐imide) (PN‐TLCP) derived from p ‐acetoxybenzoic acid (ABA), terephthalic acid (TPA), acetylated 2‐(6‐oxide‐6H‐dibenz<1,2>oxa phosphorin‐ 6‐yl)‐1,4‐dihydroxy phenylene (DOPO‐AHQ) and N , N '‐hexane‐1,6‐diylbis(trimellitimide) was prepared by melt transesterification. The chemical structure, the mesophase behavior, and the thermal properties of the copolymer were investigated with Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy ( 1 H NMR), elemental analysis, wide‐angle X‐ray diffraction (WAXD), hot‐stage polarized light microscopy (PLM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). PN‐TLCP exhibited a nematic mesophase with a strong birefringence at a low and broad mesomorphic temperature ranging from 220 to 350°C, an initial flow temperature as low as about 190°C and a glass transition temperature of about 160°C. PN‐TLCP has also good thermal stability, high char residues and excellent flame retardancy (limiting oxygen index, LOI = 71 and UL‐94 V‐0 rating). Copyright © 2009 John Wiley & Sons, Ltd.