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首页> 外文期刊>Journal of Polymers and the Environment >One-Step Extrusion to Minimize Thermal Decomposition for Processing PLA-Based Composites
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One-Step Extrusion to Minimize Thermal Decomposition for Processing PLA-Based Composites

机译：一步挤出可最大程度地减少基于PLA的复合材料的热分解

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摘要

One-step extrusion techniques (combining compounding and product extrusion together) have been developed to minimize the decomposition of polyesters during thermal processing. Such treatment is particularly meaningful for the application of biodegradable polyester composites reinforced with the fillers containing moisture or hydroxyl groups, such as cellulose and starch etc. Poly (lactic acid)/starch composites was used as a model system in this work. Two kinds of one-step extrusion systems have been developed through (1) a twin screw extruder connecting with a single extruder, and (2) a twin screw extruder with a single screw zone respectively. The comparison between the one-step and two-step extrusions has been carried out based on their microstructures and performances via characterizations of molecular weight and molecular weight distribution, Fourier transform infrared spectroscopy, as well as tensile and drop impact testing. The results demonstrated that mechanical properties of samples were enhanced with the one-step extrusion preparation, comparing with the two-step processing, particularly in toughness and tensile strength, mainly because the one-step methods reduced the decomposition of polyesters during the thermal processing. It is also expected that the one-step extrusions technology will decrease the processing cost by reducing the amount of utilized energy, and can be used for the processing of other moisture sensitive polyesters.
机译：已经开发出一种单步挤出技术（将混炼和产品挤出结合在一起）以最大程度地减少聚酯在热处理过程中的分解。这种处理对于应用可生物降解的聚酯复合材料特别有意义，该复合材料是用含有水分或羟基的填料（例如纤维素和淀粉等）增强的。在这项工作中，聚乳酸/淀粉复合材料被用作模型系统。通过（1）与单挤出机连接的双螺杆挤出机，和（2）分别具有单螺杆区的双螺杆挤出机，已经开发出两种单步挤出系统。通过表征分子量和分子量分布，傅立叶变换红外光谱以及拉伸和跌落冲击测试，基于它们的微观结构和性能，对一步和两步挤出进行了比较。结果表明，与两步加工相比，单步挤出制备可提高样品的机械性能，特别是在韧性和拉伸强度方面，这主要是因为单步方法减少了聚酯在热处理过程中的分解。还期望一步挤出技术将通过减少利用的能量的量来降低加工成本，并且可以用于其他对水分敏感的聚酯的加工。

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