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Minmin Yu,Huihui Zhang,Zhongming Liu,Zhao Ge,Fangong Kong,Huili Shao,Xuechao Hu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8
The regenerated cellulose fiber (Lyocell) and natural cellulose fiber (ramie) with different initial lengths were usedto reinforce polylactide (PLA) by melt compounding and injection molding. The fiber dimension and its distribution incomposites after injection molding were analyzed by high-resolution Fiber Quality Analyzer (FQA). Moreover, the contentsof small fibers with length < 0.2 mm were also provided by FQA. Then the influences of fiber dimension and its distributionon the mechanical properties of the composites were investigated. The results showed that fiber length was reduced duringcompounding and injection molding processes, and the longer the initial fiber length, the more severe the length declined. Compared with ramie fiber, Lyocell fiber showed a longer fiber length, smaller diameter and narrower width distribution incomposite after injection molding. Additionally, the content of small fiber played an important role in the analysis of therelation between the fiber dimension and mechanical properties of composites owing to its smaller aspect ratio. The differentmechanical characteristics of the PLA composites were attributed predominantly to the fiber aspect ratio and the small fibercontent. By comparison, Lyocell fiber exhibited better reinforcement for PLA due to the higher aspect ratio and lower smallfiber content. The tensile strength, tensile modulus and impact strength of Lyocell/PLA composite were increased by 8.61 %,75.43 % and 26.9 %, respectively.
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