High-density polyethylene crystals with double melting peaks induced by ultra-high-molecular-weight polyethylene fibre.
High-density polyethylene crystals with double melting peaks induced by ultra-high-molecular-weight polyethylene fibre.
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超高分子量聚乙烯纤维诱导的具有双熔峰的高密度聚乙烯晶体
DOI：
10.1098/rsos.180394
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发表时间：
2018-07
影响因子：
3.5
通讯作者：
Wang Z
中科院分区：
文献类型：
--
作者：
Miao W;Zhu H;Duan T;Chen H;Wu F;Jiang L;Wang Z
采用溶液结晶法制备了高密度聚乙烯（HDPE）/超高分子量聚乙烯（UHMWPE）纤维复合材料，研究了高取向基体上外延晶体生长的组分。UHMWPE纤维上HDPE晶体的扫描电子显微镜形态显示，最初在UHMWPE纤维上形成的边缘带状图案晶体后来随着结晶的进行转化为片状。广角X-射线衍射分析表明，HDPE/UHMWPE纤维复合体系中高分子链沿着纤维轴取向，HDPE的正交晶型没有改变。通过差示扫描量热法测量的纤维复合材料的热行为显示出双熔融峰，其性质，如部分熔融实验所公开的，归因于诱导晶体中存在的双层组分：内层由UHMWPE纤维诱导的更规则折叠的链晶体组成，外层形成于具有更薄和更低有序晶体结构的内层。
High-density polyethylene (HDPE)/ultra-high-molecular-weight polyethylene (UHMWPE) fibre composites were prepared via solution crystallization to investigate the components of epitaxial crystal growth on a highly oriented substrate. Scanning electron microscopy morphologies of HDPE crystals on UHMWPE fibres revealed that the edge-on ribbon pattern crystals that were formed initially on UHMWPE fibres converted afterwards to a sheet shape as crystallization progressed. Wide-angle X-ray diffraction confirmed that the polymer chain oriented along the fibre axis and the orthorhombic crystal form of HDPE remained unchanged in HDPE/UHMWPE fibre composite systems. The thermal behaviour of the fibre composites measured by differential scanning calorimetry showed double melting peaks, the nature of which, as disclosed by partial melting experiments, is ascribed to bilayer components existing in the induced crystals: the inner layer is composed of more regularly folded chain crystals induced by UHMWPE fibres, and the outer layer formed on the inner one with a thinner and lower ordered crystal structure.
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