期刊
POLYMER
卷 240, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2021.124472
关键词
Thermotropic liquid crystal copolyester; High molecular interaction; High performance; Fiber
资金
- National Natural Science Foundation of China [51803246]
- Program for Science&Technology Innovation Talents in Universities of Henan Province [22HASTIT032]
- Training Plan for Young Backbone Teachers in Colleges and Universities in Henan Province [2020GGJS140]
- Major Key Projects and Landmark Achievement Cultivation Program of Zhongyuan University of Technology [K2021ZDPY06]
- Fundamental Research Funds of Zhongyuan University of Technology [K2020YY005]
By using a one pot melt polymerization method, thermotropic liquid crystal polymers (TLCP) with strong molecular interaction were prepared using a large amount of naphthalene monomers. The simulation results showed that the naphthalene TLCPs had less chain mobility and stronger molecular interactions, resulting in a linear rigid chain conformation and superior properties.
In order to obtain thermotropic liquid crystal polymers (TLCP) with excellent comprehensive performance, naphthalene monomers (amount exceeding 50 mol%) of 6-hydroxy-2-naphthoic acid (HNA) and 2,6-naphthalene dicarboxylic acid (NDA) were used to prepare wholly aromatic TLCP with strong molecular interaction via one pot melt polymerization method in this work. The structure and properties of the copolyesters were fully investigated by experimental measurements and molecular simulation. The simulation results indicated that the naphthalene TLCPs had less chain mobility and stronger molecular interactions, and resulted in a linear rigid chain conformation, endowing the copolyesters with superior properties. As compared with the control copolyester M without naphthalene units, the resulted copolyesters had higher glass transition and melting temperature, higher melt tension, better thermal stability and fiber mechanical property. Overall, the rigidity, molecular interaction and properties of the obtained copolyesters could be efficiently improved after incorporation of the naphthalene units, which is beneficial for its processing and application.
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