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首页> 外文会议>49th International wood composites symposium >Impact of Recycling on the Mechanical and Thermo-mechanical Properties of Wood Flour/HDPE and PLA Composites
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Impact of Recycling on the Mechanical and Thermo-mechanical Properties of Wood Flour/HDPE and PLA Composites

机译：回收对木粉/ HDPE和PLA复合材料的机械和热机械性能的影响

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摘要

Plastic waste management is a serious environmental concern all over the world. According to US Environmental Protection Agency (EPA), in 2012, almost 31.8 million tons of plastics were generated in U.S. A minimum of 1.14 billion pounds of postconsumer film (which includes plastic bags and packaging) was recovered for recycling in 2013, an increase of 74 percent since 2005. At present, there are three well-known approaches for plastic waste management- (1) disposal in landfills, (2) incineration, and (3) recycling. Disposal in landfills contaminates the soil and the air while incineration makes a total destruction of the material. Recycling is most preferable since it creates no (or little) environmental pollution and reserves the material for further use. The aim of this research was to investigate the influence of recycling on the mechanical and thermo-mechanical properties of wood flour/ HDPE and PLA composites. WPC composite formulations included 30 wt% and 50 wt% oak wood flour filled PE and PLA matrices. The WPCs were recycled up to six times using twin screw extrusion process. Injection molded samples were tested for physico-mechanical properties. Scanning Electron Microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) techniques were used to investigate the fracture surfaces of tensile samples at different cycles and to monitor the change of molecular structure of the composite matrices respectively. Results show that these composites could be recycled up to six times without substantial degradation in the mechanical properties.
机译：塑料废料管理是世界范围内严重关注的环境问题。根据美国环境保护署（EPA）的数据，2012年，美国生产了将近3180万吨塑料。2013年，回收了至少11.4亿磅的消费后薄膜（包括塑料袋和包装袋）以进行回收，比上年增加了1.94亿磅。自2005年以来达到74％。目前，有三种著名的塑料废物管理方法：（1）填埋处理，（2）焚化和（3）回收。垃圾填埋场的处理会污染土壤和空气，而焚烧则会完全破坏材料。回收是最可取的，因为它不会（或几乎不会）造成环境污染，并保留材料以备将来使用。这项研究的目的是研究回收对木粉/ HDPE和PLA复合材料的机械和热机械性能的影响。 WPC复合配方包括30重量％和50重量％的橡木粉填充的PE和PLA基质。使用双螺杆挤出工艺将木塑制品回收多达六次。测试了注塑样品的物理机械性能。利用扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）技术研究了拉伸试样在不同循环下的断裂面，并监测了复合材料基体的分子结构变化。结果表明，这些复合材料可循环使用多达六次，而机械性能没有显着降低。

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