Park Jong-Seok, Lim Youn-Mook, Nho Young-Chang
Radiation Research Division for Industry and Environment, Korea Atomic Energy Research Institute, 1266 Sinjeong-dong, Jeongeup-si, Jeollabuk-do 580-185, Korea.
Materials (Basel). 2015 Apr 8;8(4):1626-1635. doi: 10.3390/ma8041626.
Polyurethane (PU) is a very popular polymer that is used in a variety of applications due to its good mechanical, thermal, and chemical properties. However, PU recycling has received significant attention due to environmental issues. In this study, we developed a recycling method for waste PU that utilizes the radiation grafting technique. Grafting of waste PU was carried out using a radiation technique with polyethylene-graft-maleic anhydride (PE-g-MA). The PE-g-MA-grafted PU/high density polyethylene (HDPE) composite was prepared by melt-blending at various concentrations (0-10 phr) of PE-g-MA-grafted PU. The composites were characterized using fourier transform infrared spectroscopy (FT-IR), and their surface morphology and thermal/mechanical properties are reported. For 1 phr PU, the PU could be easily introduced to the HDPE during the melt processing in the blender after the radiation-induced grafting of PU with PE-g-MA. PE-g-MA was easily reacted with PU according to the increasing radiation dose and was located at the interface between the PU and the HDPE during the melt processing in the blender, which improved the interfacial interactions and the mechanical properties of the resultant composites. However, the elongation at break for a PU content >2 phr was drastically decreased.
聚氨酯（PU）是一种非常受欢迎的聚合物，因其良好的机械、热和化学性能而被用于各种应用中。然而，由于环境问题，PU回收受到了广泛关注。在本研究中，我们开发了一种利用辐射接枝技术回收废PU的方法。使用聚乙烯接枝马来酸酐（PE-g-MA）通过辐射技术对废PU进行接枝。通过在不同浓度（0-10 phr）的PE-g-MA接枝PU下进行熔融共混制备了PE-g-MA接枝PU/高密度聚乙烯（HDPE）复合材料。使用傅里叶变换红外光谱（FT-IR）对复合材料进行了表征，并报告了它们的表面形态以及热/机械性能。对于1 phr的PU，在PU与PE-g-MA进行辐射诱导接枝后，在搅拌机中进行熔融加工时，PU能够很容易地引入到HDPE中。随着辐射剂量的增加，PE-g-MA很容易与PU发生反应，并且在搅拌机中进行熔融加工时位于PU和HDPE之间的界面处，这改善了所得复合材料的界面相互作用和机械性能。然而，当PU含量>2 phr时，断裂伸长率急剧下降。
