Temperature-Dependent Recrystallization Morphologies of Carbon Coated Isotactic Polypropylene Highly Oriented Thin Films
Temperature-Dependent Recrystallization Morphologies of Carbon Coated Isotactic Polypropylene Highly Oriented Thin Films
复制标题
碳包覆等规聚丙烯高取向薄膜的温度依赖性重结晶形貌
DOI：
10.1021/acs.macromol.7b00299
复制
发表时间：
2017-05-09
期刊：
影响因子：
5.5
通讯作者：
Yan, Shouke
中科院分区：
文献类型：
--
作者：
Ma, Le;Zhou, Zhenzhen;Yan, Shouke
用电子显微镜结合电子衍射研究了碳包覆聚丙烯取向薄膜的温度依赖性再结晶形貌。结果表明，真空蒸镀碳层的存在会导致预取向iPP薄膜发生熔融取向再结晶。然而，重结晶的碳涂覆的iPP薄膜的形态取决于熔融和结晶温度。在低熔化温度下，例如，低于200 °C时，无论结晶温度如何，总是产生与制备的样品具有相同分子链取向的平行排列的侧边层状结构。当在300 °C下熔融并在低温下结晶时，例如，在120 °C下，观察到边对和平对薄片。在升高的结晶温度下，例如，在150 °C下，平坦iPP晶体显示出或多或少的规则板条形状。同时，还研究了α-iPP同质外延产生的宽角度片层分支所导致的四方晶。
Temperature-dependent recrystallization morphologies of carbon-coated iPP oriented thin films were studied by electron microscopy combined with electron diffraction. It was found that the vacuum evaporated carbon layer always results in oriented melt-recrystallization of the preoriented iPP thin films. The morphology of the recrystallized carbon-coated iPP thin films is, however, dependent on both melting and crystallization temperatures. At low melting temperatures, e.g., lower than 200 °C, parallel-aligned edge-on lamellae with the same molecular chain orientation as the prepared samples were always generated regardless of crystallization temperature. When melting at 300 °C and crystallization at low temperature, e.g., 120 °C, both edge-on and flat-on lamellae were observed. At elevated crystallization temperature, e.g., 150 °C, the flat-on iPP crystals show more or less a regular lath shape. At the same time, quadrites caused by wide-angle lamellar branching originating from homoepitaxy of α-iPP were s...