This article summarizes the comparison between the preparation, structure and mechanical properties of long fiber reinforced thermoplastics （LFT） and short fiber reinforced thermoplastics （SFT）. Both of the experi...This article summarizes the comparison between the preparation, structure and mechanical properties of long fiber reinforced thermoplastics （LFT） and short fiber reinforced thermoplastics （SFT）. Both of the experiment and theory results showed that the mechanical properties of long glass fiber reinforced thermoplastics pellets （LGFRT） have been enhanced better than that of short glass fiber reinforced thermoplastics pellets （SGFRT） manufactured by molding procession. After regulation of the relative humidity by 50 % , the mechanical properties of 30 % （ weight percent） short glass fiber content in SFT （ SFT-PA6-SGF30 ） are similar to that of 40 % long glass fiber content in LFT. Howev- er, the density of the latter is about 17 % lower than that of the former. Thus, the corresponding weight of products is reduced by 13 % ;output rate is increased by 21% , and the cost is therefore significantly lowered. And it has the fol- lowing advantages： impact strength is increased by 87 % ; the proportion is reduced by 20 % ; molding cycle is short- ened by 10 % ;materials cost is saved by 20 % -30 % and the final total cost is saved by 30 % -40 %. So LFT （LFT-PP-LGF40） can replace SFT （SFT-PA6-SGF30） with the similar basic mechanical properties under normal tem- perature or 160 ℃ lower.展开更多
采用熔融共混法制备了增强增韧抗静电尼龙(PA)612材料,探讨了抗静电剂种类及用量对PA612材料抗静电性能的影响,同时研究了玻璃纤维(GF)和增韧剂三元乙丙橡胶接枝马来酸酐用量对材料力学性能的影响。抗静电性能测试结果表明,石墨烯、碳...采用熔融共混法制备了增强增韧抗静电尼龙(PA)612材料,探讨了抗静电剂种类及用量对PA612材料抗静电性能的影响,同时研究了玻璃纤维(GF)和增韧剂三元乙丙橡胶接枝马来酸酐用量对材料力学性能的影响。抗静电性能测试结果表明,石墨烯、碳纳米管在表面电阻方面的渗流阀值明显小于导电炭黑,即石墨烯、碳纳米管对PA612的抗静电效果优于导电炭黑;高用量下,添加碳纳米管的材料表面电阻比添加石墨烯的低一个数量级,但碳纳米管的成本较高。力学性能测试结果表明,GF能大幅提高材料的拉伸与弯曲强度,增韧剂能大幅提高材料的冲击性能,当增韧剂质量分数不高于10%时,材料的拉伸与弯曲强度下降幅度较小。当抗静电剂石墨烯、GF及增韧剂质量分数分别为3%,40%和10%时,制得的PA612材料具有较好的综合性能,其拉伸强度为120 MPa,弯曲强度为210 MPa,常温缺口冲击强度为10 k J/m^2,-45℃缺口冲击强度为9.6 k J/m^2,表面电阻为1×1011Ω,可满足PA612在储存、运输和使用过程中的抗静电要求。展开更多
文摘This article summarizes the comparison between the preparation, structure and mechanical properties of long fiber reinforced thermoplastics （LFT） and short fiber reinforced thermoplastics （SFT）. Both of the experiment and theory results showed that the mechanical properties of long glass fiber reinforced thermoplastics pellets （LGFRT） have been enhanced better than that of short glass fiber reinforced thermoplastics pellets （SGFRT） manufactured by molding procession. After regulation of the relative humidity by 50 % , the mechanical properties of 30 % （ weight percent） short glass fiber content in SFT （ SFT-PA6-SGF30 ） are similar to that of 40 % long glass fiber content in LFT. Howev- er, the density of the latter is about 17 % lower than that of the former. Thus, the corresponding weight of products is reduced by 13 % ;output rate is increased by 21% , and the cost is therefore significantly lowered. And it has the fol- lowing advantages： impact strength is increased by 87 % ; the proportion is reduced by 20 % ; molding cycle is short- ened by 10 % ;materials cost is saved by 20 % -30 % and the final total cost is saved by 30 % -40 %. So LFT （LFT-PP-LGF40） can replace SFT （SFT-PA6-SGF30） with the similar basic mechanical properties under normal tem- perature or 160 ℃ lower.
文摘采用熔融共混法制备了增强增韧抗静电尼龙(PA)612材料,探讨了抗静电剂种类及用量对PA612材料抗静电性能的影响,同时研究了玻璃纤维(GF)和增韧剂三元乙丙橡胶接枝马来酸酐用量对材料力学性能的影响。抗静电性能测试结果表明,石墨烯、碳纳米管在表面电阻方面的渗流阀值明显小于导电炭黑,即石墨烯、碳纳米管对PA612的抗静电效果优于导电炭黑;高用量下,添加碳纳米管的材料表面电阻比添加石墨烯的低一个数量级,但碳纳米管的成本较高。力学性能测试结果表明,GF能大幅提高材料的拉伸与弯曲强度,增韧剂能大幅提高材料的冲击性能,当增韧剂质量分数不高于10%时,材料的拉伸与弯曲强度下降幅度较小。当抗静电剂石墨烯、GF及增韧剂质量分数分别为3%,40%和10%时,制得的PA612材料具有较好的综合性能,其拉伸强度为120 MPa,弯曲强度为210 MPa,常温缺口冲击强度为10 k J/m^2,-45℃缺口冲击强度为9.6 k J/m^2,表面电阻为1×1011Ω,可满足PA612在储存、运输和使用过程中的抗静电要求。
