Facile Fabrication of 100% Bio-based and Degradable Ternary Cellulose/PHBV/PLA Composites.
Facile Fabrication of 100% Bio-based and Degradable Ternary Cellulose/PHBV/PLA Composites.
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DOI：
10.3390/ma11020330
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发表时间：
2018-02-24
期刊：
影响因子：
--
通讯作者：
Wolcott MP
中科院分区：
文献类型：
--
作者：
Qiang T;Wang J;Wolcott MP
用不可降解试剂改性生物基可降解聚合物如聚乳酸（PLA）和聚（羟基丁酸酯-共-羟基戊酸酯）（PHBV）将损害其所得复合材料的100%降解性。本工作开发了一种简便、无溶剂的制备方法，以制备100%生物基可降解的纤维素/PHBV/PLA三元复合材料。研究了球磨对纸浆纤维素纤维物理化学性能的影响，以及球磨纤维素颗粒对PHBV/PLA共混物形态结构和力学性能的影响。结果表明，球磨时间越长，通过机械破碎的方式，颗粒尺寸越小，结晶度越低。用球磨纤维素填充PHBV/PLA共混物显著增加了所有粒度和填充含量水平下的刚度，并且在一定粒度和填充含量水平下改善了它们的断裂伸长率和断裂功。还发现球磨纤维素颗粒的高填充含量对所得复合材料的机械性能是不利的。纤维素/PHBV/PLA三元复合材料在包装材料、汽车内饰件等方面具有潜在的应用前景。填充量对复合材料力学性能的影响大于粒径对复合材料力学性能的影响。统计分析与实验测试相结合提供了一种新的途径来定量评估多个变量对特定性能的影响，并找出所得复合材料的主导因素。
Modifying bio-based degradable polymers such as polylactide (PLA) and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) with non-degradable agents will compromise the 100% degradability of their resultant composites. This work developed a facile and solvent-free route in order to fabricate 100% bio-based and degradable ternary cellulose/PHBV/PLA composite materials. The effects of ball milling on the physicochemical properties of pulp cellulose fibers, and the ball-milled cellulose particles on the morphology and mechanical properties of PHBV/PLA blends, were investigated experimentally and statistically. The results showed that more ball-milling time resulted in a smaller particle size and lower crystallinity by way of mechanical disintegration. Filling PHBV/PLA blends with the ball-milled celluloses dramatically increased the stiffness at all of the levels of particle size and filling content, and improved their elongation at the break and fracture work at certain levels of particle size and filling content. It was also found that the high filling content of the ball-milled cellulose particles was detrimental to the mechanical properties for the resultant composite materials. The ternary cellulose/PHBV/PLA composite materials have some potential applications, such as in packaging materials and automobile inner decoration parts. Furthermore, filling content contributes more to the variations of their mechanical properties than particle size does. Statistical analysis combined with experimental tests provide a new pathway to quantitatively evaluate the effects of multiple variables on a specific property, and figure out the dominant one for the resultant composite materials.
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