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首页> 外文期刊>Journal of Polymers and the Environment >Structure and Properties of Polymer-Polymer Composites Based on Biopolymers and Ultra-High Molecular Weight Polyethylene Obtained via Ethylene In Situ Polymerization
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Structure and Properties of Polymer-Polymer Composites Based on Biopolymers and Ultra-High Molecular Weight Polyethylene Obtained via Ethylene In Situ Polymerization

机译：乙烯原位聚合获得的基于生物聚合物和超高分子量聚乙烯的聚合物-聚合物复合材料的结构和性能

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摘要

Polymer-polymer composites (PPC) of biopolymers (starch, cellulose, poly-3-hydroxybutyrate) and ultra-high molecular weight polyethylene (UHMWPE) were obtained by ethylene in situ polymerization (polymerization filling). Ethylene polymerization was carried out in "mild" conditions (25 A degrees C, 0.1 MPa) on a traditional Ziegler-Natta catalyst [TiCl4 + (C2H5)(2)AlCl], biopolymer-supported. Catalyst activity increases in the presence of polysaccharides depending on their type and quantity. UHMWPE matrix possesses a molecular weight of 1.20-1.65 MDa, melting point of 138-143 A degrees C, high melting enthalpy and a crystallinity of 60-70%. PPCs generally exhibit better tensile properties than neat polyethylene, such as elastic modulus and elongation at break. Thermogravimetric analysis shows a significant decrease in decomposition temperature and the rate of mass loss on both stages of PPC destruction. The photo-oxidative destruction of PPC after UV-irradiation for different periods of time was studied by FTIR and XRD. Carbonyl indices indicate the rate of oxidation to be 3-4 times greater than in neat PE. Prolonged irradiation leads to a considerable increase in crystallinity and crystallite size. Irradiated PPC films show a 90% extent of biofouling by mold fungi, compared to no growth apparent for neat samples.
机译：通过乙烯原位聚合（聚合填充）获得生物聚合物（淀粉，纤维素，聚-3-羟基丁酸酯）和超高分子量聚乙烯（UHMWPE）的聚合物-聚合物复合材料（PPC）。乙烯聚合是在传统的Ziegler-Natta催化剂[TiCl4 +（C2H5）（2）AlCl]上，在“温和”的条件下（25 A摄氏度，0.1 MPa）进行的，该催化剂由生物聚合物负载。在多糖存在下，取决于其类型和数量，催化剂活性会增加。 UHMWPE基质的分子量为1.20-1.65 MDa，熔点为138-143 A摄氏度，熔融焓高，结晶度为60-70％。 PPC通常表现出比纯聚乙烯更好的拉伸性能，例如弹性模量和断裂伸长率。热重分析表明，在分解PPC的两个阶段中，分解温度和质量损失率均显着降低。通过FTIR和XRD研究了紫外线辐照不同时间后PPC的光氧化破坏。羰基指数表明氧化速率是纯PE的3-4倍。长时间的照射导致结晶度和微晶尺寸的显着增加。辐照的PPC薄膜显示出90％的霉菌对生物的污染，而纯净样品则没有明显的增长。

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