POLYMERS AND POLYMER MATRIX COMPOSITES |
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Preparation and Properties of Poly(p-phenylene terephthalamide) Aerogel Fibers |
LI Jie1, HU Zuming1,2,*, YU Junrong1,2, WANG Yan1, ZHU Jing1
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1 School of Materials Science and Engineering, Donghua University, Shanghai 201620, China 2 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China |
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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.
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Published: 25 January 2024
Online: 2024-01-26
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Fund:National Key R & D Program of China(2021YFB3700101). |
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