Morphology and growth of extended chain crystals of polyethylene
Morphology and growth of extended chain crystals of polyethylene
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DOI：
10.1002/macp.1968.021180116
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发表时间：
1968-11
影响因子：
2.5
通讯作者：
B. Wunderlich;L. Melillo
中科院分区：
文献类型：
--
作者：
B. Wunderlich;L. Melillo
摘要：利用光学显微镜和电子显微镜对聚乙烯延伸链晶体的形貌和生长进行了研究。结果表明，球晶的形成主要是由于片层（001）表面新片层的成核、片层生长表面的分支和片层的增厚。球晶中心已被确定到初级薄片。分析结晶过程中片层的交点可以确定晶体生长的中间阶段。讨论了平行于生长面和（001）面的断口。采用表面再结晶法进行“波纹装饰”是研究断口表面的一种方法。扭结带被描述为生长缺陷。薄片的弯曲表现为与聚合物链平行的滑移。对波纹和拉伸纤维退火进行了分析。通过对延伸链晶体的观察，提出了聚乙烯在高压下延伸链晶体生长的机理。(作者)
Abstract : The morphology and growth of extended chain crystals of polyethylene is discussed on the basis of optical and electron microscopy. The spherulitic habit is shown to be caused by nucleation of new lamellae on the (001) surface of lamellae, branching of lamellae on their growth face, and thickening of lamellae. Spherulite centers have been identified down to the primary lamella. Analysis of intersections of lamellae during crystallization allowed the identification of intermediate stages of crystal growth. Fracture surfaces parallel to the growth face and the (001) face are discussed. 'Ripple decoration' by surface recrystallization is developed as a tool for fracture surface study. Kink bands are described as growth defects. Bending of lamellae is shown to go by slip parallel to the polymer chains. Ripple and drawn out fiber annealing is analyzed. All observations on extended chain crystals are used to propose a mechanism of extended chain crystal growth of polyethylene under elevated pressure. (Author)