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线性低密度聚乙烯流延膜取向与阻隔性能关系研究 被引量:1
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作者 苏萃 任敏巧 +5 位作者 郑萃 姚雪容 贾雪飞 侯莉萍 张韬毅 唐毓婧 《高分子学报》 SCIE CAS CSCD 北大核心 2021年第7期785-796,I0005,共13页
采用广角X射线衍射(WAXD),小角X射线散射(SAXS)和小角激光光散射(SALS)系统地表征了线性低密度聚乙烯(LLDPE)流延膜以及加入成核剂HPN-20E的LLDPE流延膜的多层级凝聚态结构,并研究晶体取向分布与流延膜阻隔性能之间的关系.未加成核剂的... 采用广角X射线衍射(WAXD),小角X射线散射(SAXS)和小角激光光散射(SALS)系统地表征了线性低密度聚乙烯(LLDPE)流延膜以及加入成核剂HPN-20E的LLDPE流延膜的多层级凝聚态结构,并研究晶体取向分布与流延膜阻隔性能之间的关系.未加成核剂的流延膜内PE晶体的主要取向为b轴在TDND(流延膜横向-垂直于流延膜方向)平面内的,以b轴为螺旋轴的螺旋状取向,而以b轴沿MD(流延膜机械方向)方向的方式取向的晶体分布较少.成核剂的加入改变了流延膜内晶体的取向分布以及聚集情况,b轴沿ND方向的螺旋状取向(O_(ND))的晶体明显减少,片晶的尺寸、取向程度以及微观尺寸的晶体聚集情况均发生明显变化.发现在结晶度相近的情况下,晶体的取向排列是影响阻隔性能的关键因素,进而提出用一种半定量的取向结构参数R_(ND),即X射线沿着ND方向得到的晶体(110)与(200)晶面的衍射峰面积的比值,表征晶体取向与阻隔性能之间的关系. 展开更多
关键词 聚乙烯 阻隔 结晶 取向
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Molecular Simulations in Macromolecular Science 被引量:2
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作者 Duo Xu Hai-Xiao Wan +2 位作者 xue-rong yao Juan Li Li-Tang Yan 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2023年第9期1361-1370,I0005,共11页
Molecular simulations are now an essential part of modern chemistry and physics,especially for the investigation of macromolecules.They have evolved into mature approaches that can be used effectively to understand th... Molecular simulations are now an essential part of modern chemistry and physics,especially for the investigation of macromolecules.They have evolved into mature approaches that can be used effectively to understand the structure-to-property relationships of diverse macromolecular systems.In this article,we provide a tutorial on molecular simulations,focusing on the technical and practical aspects.Several prominent and classical simulation methods and software are introduced.The applications of molecular simulations in various directions of macromolecular science are thenfeatured by representative systems,including self-assembly,crystallization,chemical reaction,and some typical non-equilibrium systems.This tutorial paper provides a useful overview of molecular simulations in the rapid progress of macromolecular science,and suggests guidance for researchers who start exploiting molecular simulations in their study. 展开更多
关键词 Molecular simulation Coarse-grained molecular dynamics Multi-scale method Polymer physics
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