Effect of solid-state shear milling on the physicochemical properties of thermally conductive low-temperature expandable graphite/low-density polyethylene composites

Effect of solid-state shear milling on the physicochemical properties of thermally conductive low-temperature expandable graphite/low-density polyethylene composites
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固态剪切研磨对导热低温可膨胀石墨/低密度聚乙烯复合材料理化性能的影响

DOI:
10.1016/j.compositesa.2013.08.009
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发表时间:
2013-12
期刊:
Composites Part A: Applied Science and Manufacturing
影响因子:
--
通讯作者:
Canhui Lu
Canhui Lu
中科院分区:
其他
文献类型:
--
作者:
Xunwen Sun;Wei Zhang;Xinxing Zhang;Canhui Lu

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采用原位膨胀熔融共混法制备了低温可膨胀石墨(LTEG)/低密度聚乙烯(LDPE)高导热复合材料。采用固态剪切球磨(S3 M)进一步改善复合材料的物理化学性能。X射线衍射(XRD)和扫描电子显微镜(SEM)证实了石墨层剥离成石墨纳米片(GNP),随后GNP在LDPE基质中相对均匀的分散,并通过S3 M改善了界面粘附。此外,GNP在复合材料中的取向形成后S3 M处理,特别是在高LTEG负载。因此,与未处理的样品相比,S3 M处理的复合材料显示出机械性能的显著增强,以及更好的结晶和热性能。此外,在50wt%石墨负载下的复合材料的热导率高达5.04W/m K。
Low-temperature expandable graphite (LTEG)/low-density polyethylene (LDPE) composites with high thermal conductivity were prepared via an in situ expansion melt blending process. Solid-state shear milling (S3M) was applied to further improve the physicochemical properties of the composites. X-ray diffraction (XRD) and scanning electron microscopes (SEM) confirmed the exfoliation of the graphite layers into graphite nanoplatelets (GNPs) and subsequent relatively homogeneous dispersion of GNPs in LDPE matrix with improved interfacial adhesions by S3M. Furthermore, orientation of GNPs in the composites is formed after S3M treatment especially at high LTEG loading. Consequently, the S3M treated composites show a significant enhancement in mechanical properties compared to the untreated samples, as well as better crystallization and thermal properties. Moreover, the thermal conductivity of the composite at 50 wt% graphite loading is as high as 5.04 W/m K.
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