交联聚乙烯回收料增韧高密度聚乙烯
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摘要
采用机械粉碎方法制备了交联聚乙烯回收料(RXLPE),并使用RXLPE填充高密度聚乙烯(HDPE),对RXLPE/HDPE复合材料的热性能、注塑制品力学性能和常温下的晶体形态进行了研究。结果表明:RXLPE填充HDPE后,材料的结晶峰值温度升高,由118℃提高到121℃,说明RXLPE具有明显的异相成核作用;随着RXLPE含量的增加,材料结晶度明显下降。RXLPE/HDPE复合材料注塑成型制品的冲击强度随着回收料含量的增加而增加,当RXLPE和HDPE比例为50∶50时,材料的冲击强度约为纯HDPE的3倍,而弯曲模量略有下降。常温下偏光显微镜结果表明,制品晶体粒径随着RXLPE含量的增加而下降,RXLPE具有细化晶粒的作用,同时也是引起注塑制品冲击强度增加的主要原因。
Recycled crosslinked polyethylene was prepared by mechanical milling,and RXLPE was used to fill high density polyethylene( HDPE). The thermal properties of composite,mechanical properties of injection molded product,and crystal morphology at room temperature of RXLPE/HDPE blend had been studied. The results showed that the crystallization peak temperature increased from 118 ℃ to 121 ℃,when HDPE was filled with RXLPE,which played a significant role in heterogeneous nucleation. As the content of RXLPE increased,the crystallinity of the material decreased. The impact strength of RXLPE/HDPE composite by injection molded increased with the increase of RXLPE content. The impact strength of RXLPE/HDPE(50∶ 50) increased about 3 times that of pure HDPE,while the bending modulus decreased slightly. The results of polarized light microscopy at room temperature showed that the crystallite size decreased with the increase of RXLPE content,which indicated that RXLPE could play a role in grain refinement,and it also caused the increase of impact strength of injection molded products.
Recycled crosslinked polyethylene was prepared by mechanical milling,and RXLPE was used to fill high density polyethylene( HDPE). The thermal properties of composite,mechanical properties of injection molded product,and crystal morphology at room temperature of RXLPE/HDPE blend had been studied. The results showed that the crystallization peak temperature increased from 118 ℃ to 121 ℃,when HDPE was filled with RXLPE,which played a significant role in heterogeneous nucleation. As the content of RXLPE increased,the crystallinity of the material decreased. The impact strength of RXLPE/HDPE composite by injection molded increased with the increase of RXLPE content. The impact strength of RXLPE/HDPE(50∶ 50) increased about 3 times that of pure HDPE,while the bending modulus decreased slightly. The results of polarized light microscopy at room temperature showed that the crystallite size decreased with the increase of RXLPE content,which indicated that RXLPE could play a role in grain refinement,and it also caused the increase of impact strength of injection molded products.
引文
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[6]郝建秀,王海刚,王伟宏,等.利用弹性体增韧木粉/HDPE复合材料[J].复合材料学报,2016,33(5):976-983.
[7] BIAN J,WANG G,LIN H L,et al. HDPE composites strengthenedtoughened synergistically by l-aspartic acid functionalized graphene/carbon nanotubes hybrid nanomaterials[J]. Journal of Applied Polymer Science,2017,134(29):45055.
[8] SIRISINHA K,CHUAYTHONG P. Reprocessable silane-crosslinked polyethylene:property and utilization as toughness enhancer for highdensity polyethylene[J]. Journal of Materials Science,2014,49(14):5182-5189.
[9] NAVRATIL J,MANAS M,MIZERA A,et al. Recycling of irradiated high-density polyethylene[J]. Radiation Physics and Chemistry,2015,106:68-72.
[10] BAEK B K,SHIN J W,JUNG J Y,et al. Continuous supercritical decrosslinking extrusion process for recycling of crosslinked polyethylene waste[J/OL]. Journal of Applied Polymer Science,2015,132(6)[2014-09-10]. https://doi. org/10. 1002/app. 41442.
[11] BAEK B K,LA Y H,LEE A S,et al. Decrosslinking reaction kinetics of silane-crosslinked polyethylene in sub-and supercritical fluids[J].Polymer Degradation and Stability,2016,130:103-108.
[12] ISAYEV A I,HUANG K. Decrosslinking of crosslinked high-density polyethylene via ultrasonically aided single-screw extrusion[J].Polymer Engineering and Science,2014,54(12):2715-2730.
[13] WU H,LIANG M,LU C. Morphological and structural development of recycled crosslinked polyethylene during solid-state mechano-chemical milling[J]. Journal of Applied Polymer Science,2011,122(1):257-264.
[14] ZHANG X,LU C,LIANG M. Preparation of thermoplastic vulcanizates based on waste crosslinked polyethylene and ground tire rubber through dynamic vulcanization[J]. Journal of Applied Polymer Science,2011,122(3):2110-2120.
[15] KRUPA I,LUYT A S. Mechanical properties of uncrosslinked and crosslinked linear low-density polyethylene/wax blends[J]. Journal of Applied Polymer Science,2001,81(4):973-980.