ON THE MORPHOLOGY OF MELT-CRYSTALLIZED POLYETHYLENE .1. LAMELLAR PROFILES
ON THE MORPHOLOGY OF MELT-CRYSTALLIZED POLYETHYLENE .1. LAMELLAR PROFILES
复制标题
熔融结晶聚乙烯的形态 1. 层状剖面
DOI：
10.1098/rspa.1981.0113
复制
发表时间：
1981-01-01
影响因子：
--
通讯作者：
HODGE, AM
中科院分区：
文献类型：
--
作者：
BASSETT, DC;HODGE, AM
熔融结晶聚乙烯的形态进行了调查，它已被发现，所有的标本是高度层状。根据b-投影中的片层轮廓，可以对织构进行分类。e.沿着球晶的半径对于聚乙烯结晶为正交相，只有三种类型的层状配置文件已被观察到容易获得的生长条件。存在交替{201}小平面的脊状片、平面{201}片和S形片，其在第一近似下可通过平行于c位移{100}的横向区域的剪切从{201}片晶衍生。此外，还可以区分形成结构框架的第一层纹或主要纹层与填充结构框架的后来形成的纹层或辅助纹层。优势叶片可能有脊状，平面或S形的轮廓，但附属叶片似乎只有脊状或平面。脊占主导地位的表形成制度下，我的条件下，作为一个结果，不同的方面的增长。脊和生长刻面的组合表明褶皱的规律性。S形片层通常在制度II的增长中占主导地位。他们似乎已经变形的平面{201}片与带状球晶的形成有关的力量。
The morphology of melt-crystallized polyethylene has been surveyed, and it has been revealed that all specimens are highly lamellar. Classification of the textures is possible in terms of the lamellar profiles inb-projection, i. e. down the radii of spherulites. For polyethylene crystallized as the orthorhombic phase only three types of lamellar profile have been observed for readily accessible growth conditions. There are ridged sheets of alternating {201} facets, planar {201} sheets and S-shaped sheets which are, to a first approximation, derivable from {201} platelets by shear of the lateral regions displacing {100} parallel toc. It is possible, moreover, to distinguish between the first-forming or dominant lamellae which lay down the framework of the texture and the later-forming or subsidiary lamellae which fill the framework. Dominant lamellae may have ridged, planar or S-shaped profiles but subsidiary lamellae appear only ridged or planar. Ridged dominant sheets form under régime I conditions as a consequence of distinct facets on the growth front. The association of ridges and growth facets indicates regularity in folding. S-shaped sheets are usually dominant in régime II growth. They appear to have been deformed from planar {201} sheets by forces associated with the formation of banded spherulites.