Microstructural developments of poly (p-phenylene terephthalamide) fibers during heat treatment process: a review

Materials Research

Dawelbeit Ahmed¹  Zhong Hongpeng¹  Kong Haijuan¹  Liu Jing¹  Ma Yu¹  Yu Muhuo¹ 

[1] ,Donghua University College of Material Science and Engineering State Key LaboratoryShanghai,China

关键词: heat treatment;    PPTA;    crystal structure;    mechanical properties;    microstructure;   

DOI  :  10.1590/1516-1439.250313

来源: SciELO

【 摘 要 】

Poly (p-phenylene terephthalamide) fibers prepared by wet or dry-jet wet spinning processes have a notable response to very brief heat treatment (seconds) under tension. The modulus of the as-spun fiber can be greatly affected by the heat treatment conditions (temperature, tension and duration). The crystallite orientation and the fiber modulus will increase by this short-term heating under tension. Poly (p-phenylene terephthalamide) fibers have a very high molecular orientation (orientation angle 12-20°). Kevlarï and Twaronï fibers are poly (p-phenylene terephthalamide) fibers. This review reports for PPTA fibers the heat treatment techniques, devices and its process conditions. It reports in details the structural relationships between the fiber properties which are influenced by the heat treatment process. In particular, focused deeply on the effect of the crystal structure and the morphology of the fibers on the mechanical properties of PPTA fibers.

【 授权许可】

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