Formation Mechanism and Morphology of β-Transcrystallinity of Polypropylene Induced by Two-Dimensional Layered Interface
Formation Mechanism and Morphology of β-Transcrystallinity of Polypropylene Induced by Two-Dimensional Layered Interface
复制标题
DOI：
10.1021/acs.macromol.5b00396
复制
发表时间：
2015-06
期刊：
影响因子：
5.5
通讯作者：
Shuo Yang;Huaning Yu;Fan Lei;Jiang Li;Shaoyun Guo;Hong Wu;Jiabin Shen;Y. Xiong;Rong Chen-Rong-Ch
中科院分区：
文献类型：
--
作者：
Shuo Yang;Huaning Yu;Fan Lei;Jiang Li;Shaoyun Guo;Hong Wu;Jiabin Shen;Y. Xiong;Rong Chen-Rong-Ch
将β-成核聚丙烯（β-PP）与聚丙烯（PP）共挤出形成不同层数的交替层状结构。层状样品在130 °C等温结晶过程中，在β-PP和PP层间的二维层状界面处，高密度β-晶核不对称生长。在β-PP层中，β-片晶的生长很快被其它β-球晶所终止。在PP层中，由于α-晶体的形成延迟，所有β-晶体都可以垂直于界面自由生长，最终形成约25 μm厚的β-transmittance（β-TC）层。当PP层厚度小于50 μm时，PP层几乎被β-TC所占据。β-TC的有序排列导致β-TC层的分子链平行于界面取向。随着层数的增加，β-TC含量和取向度增加。本文提供了一种简单、有效的制备连续、无污染纳米颗粒的方法。
The β-nucleated polypropylene (β-PP) and polypropylene (PP) were coextruded to form the alternating layered structure with different layer number. During the isothermal crystallization of layered samples at 130 °C, the high-density β-nuclei at the two-dimensional layered interfaces between β-PP and PP layers grew asymmetrically. In the β-PP layer, the growth of β-lamellae was quickly terminated by other β-spherulites. In the PP layer, because the formation of α-crystals delayed, all β-lamellae could freely grow perpendicular to the interface and finally form the β-transcrystallinity (β-TC) layer with about 25 μm thickness. If the thickness of PP layer was lower than 50 μm, PP layer would be almost occupied by β-TC. The ordered arrangement of β-TC led to an orientation of molecular chains of β-TC layer parallel to the interface. With the increase of layer number, the content of β-TC and orientation degree of layered samples increased. This paper provided a simple and effective method to prepare continuous,...