Abstract
In this paper, a resin with high adhesion, easy curing, good flexibility, and high temperature resistance was prepared from polyimide fiber paper. First, in order to improve the toughness and curability of impregnating resin, epoxy resin was modified by addition of vinyl silicone resin. Subsequently, ternary resin with high temperature stability was obtained by polyimide resin addition. Among the investigated conditions, the optimal additive amount of vinyl silicone resin and polyimide resin was 30% and 5%, respectively. The prepared ternary resin has better toughness, crosslinking degree, high temperature stability (5% mass loss at 339.2 °C) and no obvious glass transition at high temperature. Finally, the polyimide fiber paper-based composite material was impregnated with modified epoxy resin and ternary resin, respectively. The results shows that the paper-based composite material impregnated with modified epoxy resin has a better fiber bonding degree, a smooth surface, and contact angle could reach up to 148.71°. Meanwhile, the paper-based composite material impregnated with ternary resin has good high temperature resistance, and the tensile index of the paper-based composite material could reach up to 35.1 N·m/g at 200 °C.
Highlights
Polyethylene fiber [3,4], paper-based composite materials made of polyimide fiber have better high temperature resistance
Much previous research has reported the preparation, characterization and applications of paper-based composite materials made of polyimide fiber [5]
This study focuses on the structure, morphology and thermal stability of epoxy resin, modified epoxy resin, and ternary resin, and the effect of impregnation on the properties of polyimide fiber paper-based composites (Its density is about 1.4 g/cm3, and its thickness does not exceed 0.6 mm)
Summary
Due to the lack of hydroxyl group, polyimide cannot participate in fibrillation, which leads to the poor mechanical property of the product [6] Many different methods, such as blending [7], hot pressing [8], fiber modification [9,10,11], and impregnating [12,13], have been reported to improve the strength of paper-based composite materials made of polyimide fiber. Stoica and others [17] reported a polyimide paper-based composite with good temperature resistance They studied polyimide resin-reinforced paper-based composites from the perspectives of fiber distribution, pore size distribution, and form of reinforcement, but the mechanical properties of fiber-paper-based composites did not change significantly. The obtained composite material has a smooth surface, is permanently flame-retardant, has stable dimensions, and has a long service life, and can be used for high-efficiency smoke protection masks, fire protection and interior decoration of building materials
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