Comparison between the preparation,structure and mechanical properties of long fiber reinforced thermoplastics and short fiber reinforced thermoplastic

作     者：Fang Kun Yang Jie Wu Sizhu Li Mei Ma Mingtu 

作者机构：The Key Lab of Beijing on Novel Polymer MaterialsBeijing University of Chemical Technology Beijing Nashengtong Advanced Materials & Technology Co.Ltd.Thermoplastic Composites Manufacturing & Processing Technology Center Technology Center of Great Wall Motor Company LimitedKey Laboratory of Automotive Safety Integration & Smart Control of Hebei Province China Automotive Engineering Research Institute Co.Ltd. 

出 版 物：《Engineering Sciences》 (中国工程科学（英文版）)

年 卷 期：2012年第10卷第6期

页      面：83-88,96页

学科分类：0821[工学-纺织科学与工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 082101[工学-纺织工程] 

主　　题：long glass fiber reinforced thermoplastics short glass fiber reinforced thermoplastics mechanical properties comparison 

摘      要：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.