<br>使用 SAXS-CT 研究的梯度纳米结构及其与注塑成型 PBAT 机械性能的关系,Macromolecules

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使用 SAXS-CT 研究的梯度纳米结构及其与注塑成型 PBAT 机械性能的关系
Macromolecules ( IF 5.1 ) Pub Date : 2024-09-29 , DOI: 10.1021/acs.macromol.4c01079
Nan Meng _{1,

2,

3} , Jian-Rong Zeng _{1,

2,

4} , Feng-Gang Bian _{1,

2,

4} , Peng Rao _{1,

2} , Kun Qian _{1,

2,

4,

5} , Xiang-Yue Liu ₃ , Guang-Feng Liu ₁ , Yi-Wen Li ₁ , Feng-Yang Wu ₆ , Guo-Qi Ma ₆ , Gan-Ji Zhong ₆

Affiliation

聚合物加工条件的差异会导致聚合物性能的显著差异。结构表征起着重要作用，但确定聚合物加工与性能之间的关系具有挑战性。小角 X 射线散射显微断层扫描（SAXS-CT）是一种前所未有的新方法，为揭示聚合物微观结构显示出强大的前景。本研究已用于分析由具有各种参数的振荡剪切注射成型（OSIM）生产的聚己二酸丁二醇酯-共对苯二甲酸酯（PBAT）的梯度纳米结构。使用这种方法的显着好处是，几毫米的样本几乎可以分成数千个体素，同时每个体素中的纳米结构信息都是无损提取的。对于特定 OSIM 加工生产的每个样品，重建近 10,000 个二维散射图案，并根据巨大的散射数据一一绘制结构参数的详细三维分布，包括长周期、薄片厚度、非晶层厚度、结晶度和取向。有趣的是，这些参数的分布表明样品横截面上有一个非常清晰的环带，并且该条带的大小随样品的制备条件而变化。在以前使用其他表征方法的研究中从未观察到过这种现象。结果表明，高剪切时间有利于在 OSIM 制备的样品中形成薄片。研究还表明，与传统注塑成型（CIM）相比，OSIM 加工通常可以提高 PBAT 的杨氏模量，低温和高剪切持续时间将大大提高其拉伸强度。SAXS-CT 获得的准确而详细的纳米结构为建立工艺技术与注塑成型聚合物结构之间的关系铺平了一条新道路。

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Gradient Nanostructure and its Relationship with the Mechanical Properties of Injection-Molded PBAT Studied Using SAXS-CT

The difference in the polymer processing conditions can lead to a significant difference in the polymer performance. Structural characterization plays an important role, but it is challenging to determine the relationship between polymer processing and performance. An unprecedented new method in development, small-angle X-ray scattering microtomography (SAXS-CT) shows powerful prospects for revealing the polymer microstructures. This study has been used to analyze the gradient nanostructures of poly(butylene adipate-co-terephthalate) (PBAT) produced by an oscillation shear injection molding (OSIM) with various parameters. The significant benefit of using this approach is that a sample of several millimeters can be virtually divided into thousands of voxels while the nanostructure information in each voxel is extracted nondestructively. For each sample produced by specific OSIM processing, nearly 10,000 two-dimensional scattering patterns are reconstructed, and the detailed three-dimensional distribution of structural parameters, including the long period, lamella thickness, amorphous layer thickness, crystallinity, and orientation are drawn one by one according to the tremendous scattering data. Interestingly, the distribution of these parameters shows a very clear ring band in the cross-section of the sample, and the size of this band varies with the preparation conditions of the samples. Such a phenomenon has never been observed in previous studies using other characterization methods. The results reveal that a high shear time is beneficial for the formation of lamellae in the OSIM-made samples. It also suggests that compared to conventional injection molding (CIM), OSIM processing can generally enhance Young’s modulus of PBAT, and low temperature and high shear duration will greatly boost its tensile strength. The accurate and detailed nanostructure obtained by SAXS-CT paves a new way to establish the relationship between the process technology and the structure of the injection-molded polymer.

更新日期：2024-09-29

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