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【答案】应助回帖
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zbzt3000: 金币+200, 翻译EPI+1, ★★★很有帮助, 谢谢 2013-12-09 18:05:29
能力、时间有限，供参考：
UHMWPE fiber is the third generation high performance fiber after carbon fiber and Kevlar fiber. It has advantages of low density, high specific modulus, high specific strength and excellent energy absorption. Its appearance broke the monopoly of Kevlar fiber in the field of bullet-proof materials and it tends to gradually replace the latter. Hence, with respect to analyses of the bullet-proof and wear comfort as well as other general performance, UHMWPE fiber is the best bullet-proof fiber generally recognised today. The new material IF-WS2 (inorganic fullerene-like, IF) has a spherical nesting hollow structure and its spherical shape with smooth surfaces makes stress uniformly distributed at grain surfaces. Therefore this nesting hollow structure can greatly absorb shock wave energy, rendering excellent shock resistance and absorption properties.
This project combines the advantages of the superior shock wave absorption of IF-WS2 and the excellent shock resistance of UHMWPE fiber. By dispersing IF-WS2 uniformly into UHMWPE spinning solutions and using gel spinning molding technology, a UHMWPE/WS2 composite bullet-proof material with generally excellent performance is prepared. Through live shell experiment, the bullet-proof performance and mechanism of UHMWPE/WS2 composite bullet-proof material is evaluated in order to develop new generations of composite bullet-proof materials with superior performance.
1. A series of nano WS2-strengthened UHMWPE/WS2 composite fiber are prepared by adding nano WS2, which is treated by coupling agent, to UHMWPE spinning solutions. Impacts of adding nano WS2 on the microstructure, mechanical properties, heat stability and creep of UHWMPE fiber are studied. The results show that nano WS2 has a good dispersibility in UHMWPE/WS2 composite fiber. The addition of nano WS2 does not have significant impact on the aggregation structure and Raman structure of UHMWPE. When the addition of nano WS2 is at 4wt‰, the tensile modulus of UHMWPE fiber increases from 1203 to 1326 cN/dtex, i.e. 10%. Moreover, the addition of nano WS2 has also significantly improved the heat resistance and creep resistance performance of UHMWPE fiber.
2. Through live shell experiment, SEM, TEM and X-ray diffraction and other analytical means of characterisation, the impact of adding nano WS2 on shock resistance for UHMWPE bullet-proof materials is evaluated. Integrating the bullet-proof performance measurements of UHMWPE/WS2 composite material and the changes in micro-morphology of IF-WS2 grains in UHMWPE/WS2 composite material, before and after the bullet shock, a bullet-proof mechanism for the UHMWPE/WS2 composite material is proposed. That is, the sub-spherical structure of IF-WS2 nano grains in UHMWPE/WS2 composite fiber can greatly absorb external shock, hence effectively suppress the damage to UHMWPE/WS2 composite material by the bullet shock. |
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