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Citation: ZHOU Jian-Mei. Dissolvability and Thermal Property of A Thermotropic Liquid Crystalline Polyamide[J]. Chinese Journal of Applied Chemistry, ;2007, 24(12): 1458-1460. shu

Dissolvability and Thermal Property of A Thermotropic Liquid Crystalline Polyamide

ZHOU Jian-Mei ^,

1.
College of Biochemistry, Inner Mongolia Universty of Science & Technology, Inner Mongolia, Baotou 014010

Corresponding author: ZHOU Jian-Mei,
Received Date: 6 January 2007
Available Online: 25 April 2007
Fund Project: 内蒙古自然科学基金(20050801071)资助项目 (20050801071)

Via direct polycondensation method,a thermotropic liquid crystalline polyamide with a high moleculor weight(η_inh=1.063 dL/g) was prepared from the novel diacid PEG₃ and a commercial aromatic diamine.The thermal and the deliquescent properties of the polyamide were studied.The result shows that the melting point(T_m=307.8℃) of the polyamide was reduced effectively because of the introduction of flexible chain,which also favored the formation of liquid crystalline phase.Moreover,the phenyl rings introduced distributed evenly the rigidity of the polyamide,which maintained the heat-resistant characteristic of the polyamide,and increased the stability of the liquid crystalline phase(ΔT=T_i-T_m=66.1℃),and favored the application of the liquid crystalline polymer.TGA showed good thermal stability of the poliamide,where the temperature for a mass loss of 5% was above 400℃.The solvent-resistance of the polyamide was good.It was not solvable in nonpolar solvents,and was soluble partly in strong polar,pure solvents,and soluble in saliferous complex solvents(LiCl or CaCl₂).
- Thermotropic Liquid Crystalline polyamide,
- dissolvability,
- thermal property
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