Structure of spherulite in Polybutene-1 investigated by wide angle X-ray scattering computed tomography
Structure of spherulite in Polybutene-1 investigated by wide angle X-ray scattering computed tomography
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DOI：
10.1016/j.polymertesting.2023.108003
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发表时间：
2023-03
期刊：
影响因子：
5.1
通讯作者：
Peng Rao;Jianrong Zeng;Fenggang Bian;Guangfeng Liu;Yiwen Li;Nan Meng
中科院分区：
文献类型：
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作者：
Peng Rao;Jianrong Zeng;Fenggang Bian;Guangfeng Liu;Yiwen Li;Nan Meng
研究球晶的结构对更好地理解聚合物结晶过程和机理具有重要意义，对高性能聚合物产品的设计和制造具有重要意义。广角X射线散射CT(WAXS-CT)是一种新的具有空间分辨率的无损检测方法，用于表征聚丁烯-1(PB-1)的球晶结构。成功地提取并重建了PB-1球晶中5个晶面的散射强度的空间分布。由不同晶面的散射强度得到的晶片取向，大致显示出球晶中从中心到外围的合理的径向分布。这种分布使WAXS扫描可以更容易地在球晶中的某些特定位置观察到每个晶面。例如，球晶外围容易观察到晶面(220)和(511)，而球晶中心容易观察到晶面(212)。晶体取向分布也显示出球晶生长过程中的不规则分枝现象。有趣的是，沿着球晶的径向，结晶度是先增加后减少。这一变化很好地反映了球晶生长过程中结晶和分枝过程中的分子偏析。在这里，WAXS-CT揭示的结果可以为理解PB-1球晶的内部结构和形成机制提供一个新的视角。
Investigating the structure of spherulite is instructive for better understanding the polymer crystallization process and mechanism, which is critical for the design and manufacture of polymeric products with high performance. Wide angle X-ray scattering computed tomography (WAXS-CT), a novel nondestructive method with ability of spatial resolution, is developed and applied to characterize the structure of spherulite in Polybutene-1 (PB-1). Spatial distribution of scattering intensity for 5 lattice-planes in PB-1 spherulite has been successfully extracted and depicted by reconstruction. The crystal lamellae orientations, derived from the scattering intensity for various lattice-planes, roughly shows a reasonable radial distribution from center to periphery in the spherulite. This distribution makes each lattice-plane can be observed by the WAXS scanning more easily at some specific positions in the spherulite. For example, lattice-planes (220) and (511) are easy to be observed in the periphery of spherulite, while lattice-plane (212) are apt to be observed in the spherulite center. The crystal orientation distribution also showcases the irregular branching during the growth of spherulite. Interestingly, the degree of crystallization is observed to increase first and then decrease along the radial direction of spherulite. This variation well mirrors the molecular segregation in the crystallization and the branching during the spherulite growth. Here, the results revealed by WAXS-CT can provide a new perspective for comprehending the internal structure and formation mechanism of PB-1 spherulite.