聚对苯二甲酰对苯二胺气凝胶纤维的制备与性能

doi:10.11896/cldb.22080102

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Abstract Aerogel fibers have attracted tremendous attention in the field of wearable thermal insulation because of its good flexibility. Poly(p-phenylene terephthalamide) (PPTA) has excellent heat resistance, chemical resistance and other properties, and is an ideal material for preparing aerogel fibers. However, the process of preparing aerogel fibers from aramid nanofiber dispersion suffer from complex, time-consuming and costly, limiting their application in practical conditions. Here, PPTA solution with good processability was synthesized by solution polymerization at low temperature, and then the combine of wet-spinning and freeze drying was used to fabricate PPTA aerogel fibers with excellent weavability. The effects of PPTA solution concentration on the pore structure and mechanical strength of PPTA aerogel fibers were studied. The lowest thermal conductivity (29.65 mW/(m·K)) was attained when the concentration of PPTA solution was 2wt%. Meanwhile, the PPTA aerogel fibers de-monstrate superior mechanical property (7.8 MPa), high specific surface area (291 m²/g) and porosity (94.5%). When the concentration of PPTA solution increases to 5wt%, the breaking strength of the aerogel fibers can achieve 20.5 MPa. This work shows that PPTA solution prepared through the low-temperature-solution polycondensation may offer a rapid approach to achieve excellent mechanical strength, extremely high porosity, ultra-low density and thermal conductivity of PPTA aerogel fibers, allowing for cost-effective and simplified production of stronger PPTA aerogel fibers, which opens up a new way for the design and manufacture of the next generation of thermal insulation textiles.

Key words： poly(p-phenylene terephthalamide) (PPTA) wet-spinning aerogel fiber thermal insulation high temperature

Published: 25 January 2024 Online: 2024-01-26

CLC number:

TB324

Fund:National Key R & D Program of China(2021YFB3700101).

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	Articles by authors
	LI Jie
	HU Zuming
	YU Junrong
	WANG Yan
	ZHU Jing

Cite this article:

LI Jie,HU Zuming,YU Junrong, et al. Preparation and Properties of Poly(p-phenylene terephthalamide) Aerogel Fibers[J]. Materials Reports, 2024, 38(2): 22080102-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22080102 OR http://www.mater-rep.com/EN/Y2024/V38/I2/22080102

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