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首页> 外文期刊>Journal of Applied Polymer Science >Tensile behavior of irradiated recycled polyolefin plastics
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Tensile behavior of irradiated recycled polyolefin plastics

机译：辐照再生聚烯烃塑料的拉伸行为

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摘要

Solid wastes represent a potential source for raw materials in the world. In Brazil, municipal solid waste (MSW; 2-%) is expected to grow at a rate per year higher than the worldwide rate (1%). On the other hand, the consumption of polymer blends increases at a rate more than twice that of all plastics. Therefore, the recycling of polymeric blends has gained increasing attention in the world due to economic and environmental considerations. A two-step process, developed at the Institute (IMA/UFRJ), allows one to recover plastic residues and permits the production of materials with controllable composition and homogeneous characteristics. The compression behavior of polyblends, composed of typical polymers that appear in domestic wastes-low and high polyethylenes-can be improved by gamma irradiation. In the present work, the tensile behavior of recycled 75/25 blends of low-density polyethylene (LDPE) and high-density polyethylene (HDPE), after exposure to gamma rays in the air, was investigated. Tensile testing, scanning electron microscopy, infrared and solid-state C-13-nuclear magnetic resonance spectroscopy, as well as gel content were used to study the effect of gamma irradiation on the polymer blends. The tensile strength was found to increase with radiation dose while the elongation at break decreased. Our experimental results indicate that the gamma irradiation degradation process involves crosslinking at lower doses and chain scission at higher doses. (C) 2000 John Wiley & Sons, Inc. [References: 28]
机译：固体废物是世界上潜在的原材料来源。在巴西，城市固体废物（城市固体废弃物; 2-％）预计将以每年超过全球1％的速度增长。另一方面，聚合物共混物的消耗增加的速度是所有塑料的两倍。因此，出于经济和环境方面的考虑，聚合物共混物的回收在世界上越来越受到关注。该研究所（IMA / UFRJ）开发了一种两步法，可以回收塑料残留物，并可以生产具有可控成分和均质特性的材料。掺混料的压缩行为可以通过伽马射线辐射来改善，该掺混料由生活垃圾中的典型聚合物（低聚乙烯和高聚乙烯）组成。在本工作中，研究了在空气中暴露于伽玛射线后，低密度聚乙烯（LDPE）和高密度聚乙烯（HDPE）的回收75/25混合物的拉伸性能。拉伸测试，扫描电子显微镜，红外和固态C-13核磁共振波谱以及凝胶含量被用来研究γ辐照对聚合物共混物的影响。发现抗张强度随辐射剂量而增加，而断裂伸长率降低。我们的实验结果表明，γ辐射降解过程涉及较低剂量的交联和较高剂量的断链。 （C）2000 John Wiley＆Sons，Inc. [参考：28]

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