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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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干法双拉锂离子电池隔膜的制造与表征
DOI: 10.11777/j.issn1000-3304.2015.15165, PP. 1235-1245
Keywords: β聚丙烯,二次屈服,晶片分布宽度,孔径分布均匀性
Abstract:
总结了对β-PP铸片晶片分布的均匀性进行快速评价,进而衡量隔膜的孔径分布、厚度分布均匀性的最新研究思路和进展.相关研究通过精确控制结晶温度制备了5组具有相似结晶度、高β晶含量但是不同晶片厚度分布的β-PP流延铸片,并对其β晶片的厚度分布情况进行分析.对其进行拉伸测试,发现了其应力应变曲线出现奇特的二次屈服现象.通过对β-PP在不同拉伸阶段的结构形态进行详细表征,得出二次屈服点是折叠链晶片拉直转化为无定型相的过渡点.同时发现β晶晶片分布越窄,二次屈服出现时的应变值就越大.另一方面,对铸片进行双向拉伸制备隔膜,发现晶片分布越窄的铸片生产的隔膜孔径分布就越窄.退火热处理后的拉伸测试也进一步验证了此规律.因此,可利用室温下的单轴拉伸测试对β-PP流延铸片内部晶片分布宽度,以及其所制备隔膜的孔径分布进行简单而有效地评价.
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