Surface melting in melt-crystallized linear polyethylene
Surface melting in melt-crystallized linear polyethylene
复制标题
DOI：
10.1016/0032-3861(86)90001-7
复制
发表时间：
1986-08
期刊：
影响因子：
4.6
通讯作者：
Y. Tanabe;G. Strobl;E. W. Fischer
中科院分区：
文献类型：
--
作者：
Y. Tanabe;G. Strobl;E. W. Fischer
用X射线小角散射相关函数分析法研究了线性聚乙烯预熔过程中的形态变化。非晶区的厚度<da>随温度的变化呈可逆变化，表明存在局部平衡态。在加热过程中，<dc>当温度低于初始结晶温度（Tc）时，层状结构的平均厚度首先降低。的同时减少<dc>和增加<da>提供了证据的表面熔融的laminate。观察到晶体层厚度的不可逆增长（增加<dc>）。它不影响非晶区的厚度，其保持不变。
Morphological changes during the premelting of linear polyethylene were investigated by small-angle X-ray scattering using correlation-function analysis. The thickness of the amorphous regions, <da>, showed a reversible change with temperature, which indicates presence of a local equilibrium state. During heating, the average thickness of lamellae <dc> decreases first for temperatures below the initial crystallization temperature (Tc). The simultaneous decrease in <dc> and increase in <da> provide evidence for a surface melting of the lamellae. AboveTcan irreversible thickness growth of the crystalline lamellae (increase of <dc>) is observed. It does not affect the thickness of the amorphous regions, which remains unchanged.