文章摘要
纤维素/聚乳酸复合材料的结构与性能
Micro-Structure and Properties of Cellulose Fiber/Polylactide Composites
  
DOI:10.16865/j.cnki.1000-7555.2018.06.010
中文关键词: 聚乳酸  纤维素  球磨  增韧  耐热性
英文关键词: polylactide  cellulose  ball milling  toughing  thermostability
基金项目:陕西省自然科学基础研究计划项目(2015JM5255);陕西教育厅自然专项计划项目(15JK1354);西安工业大学校长基金重点项目(XAGDXJJ1210)
作者单位
强 涛1,2, Wang Jinwu2, Wolcott P Michael2 1. 西安工业大学 材料与化工学院陕西 西安 7100212. 华盛顿州立大学 复合材料与工程中心美国 普尔曼 99164 
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中文摘要:
      以机械球磨法预处理纸浆纤维素纤维,研究球磨对纤维素形貌和结构的影响;以纤维素颗粒为填料,通过熔融加工方法,制备出可完全再生且可完全降解的聚乳酸(PLA)复合材料,对复合材料的形貌、结构和性能进行了表征测试。结果表明,作为干法工艺,机械球磨可以简便地制备微晶纤维素(MCC)。加入纤维素颗粒以后,复合材料的冲击强度显著增加(最高达70.7%),断面出现韧性断裂特征;PLA的玻璃化转变温度和冷结晶温度升高,最大分解速率温度降低约15 ℃,热稳定性略有下降。
英文摘要:
      Pulp cellulose fibers were mechanochemical pre-treated to access the filler for thermoplastic composites via melt-processing method. The cost-efficient, 100% bio-based and degradable cellulose/polylactide (PLA) composite materials were manufactured via extrusion blending followed by injection molding. Then, morphology, structure and properties of the ball-milled cellulose and the resultant composite materials were investigated. The results show that the dry ball-milling process turned the cotton-like cellulose fibers into granular microcrystalline celluloses (MCC) physically, which ensures that the pulp celluloses can be used to fill PLA via melt processing method. The impact resistance of cellulose/PLA is improved significantly, compared with that of pure PLA. Also, their impact fractured surfaces illustrate some characteristics of ductile fracture. Addition of the ball-milled celluloses into PLA increases the glass transition temperature and cold crystallization temperature, while decreases the temperature at the maximum decomposition rate, which means that the thermostability of PLA reduces with addition of the cellulose particles.
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