Zherebtsov Dmitry, Chukov Dilyus, Royaud Isabelle, Ponçot Marc, Larin Ilya, Statnik Eugene S, Drozdova Taisia, Kirichenko Alexey, Salimon Alexey, Sherif Galal, Besnard Cyril, Korsunsky Alexander M
Center for Composite Materials, National University of Science and Technology "MISiS", Moscow 119049, Russia.
Institut Jean Lamour, Université de Lorraine, CNRS, IJL, F-54000 Nancy, France.
Polymers (Basel). 2021 Apr 27;13(9):1408. doi: 10.3390/polym13091408.
The structure of self-reinforced composites (SRCs) based on ultra-high molecular weight polyethylene (UHMWPE) was studied by means of Wide-Angle X-ray Scattering (WAXS), X-ray tomography, Raman spectroscopy, Scanning Electron Microscopy (SEM) and in situ tensile testing in combination with advanced processing tools to determine the correlation between the processing conditions, on one hand, and the molecular structure and mechanical properties, on the other. SRCs were fabricated by hot compaction of UHMWPE fibers at different pressure and temperature combinations without addition of polymer matrix or softener. It was found by WAXS that higher compaction temperatures led to more extensive melting of fibers with the corresponding reduction of the Herman's factor reflecting the degree of molecular orientation, while the increase of hot compaction pressure suppressed the melting of fibers within SRCs at a given temperature. X-ray tomography proved the absence of porosity while polarized light Raman spectroscopy measurements for both longitudinal and perpendicular fiber orientations showed qualitatively the anisotropy of SRC samples. SEM revealed that the matrix was formed by interlayers of molten polymer entrapped between fibers in SRCs. Moreover, in situ tensile tests demonstrated the increase of Young's modulus and tensile strength with increasing temperature.
通过广角X射线散射（WAXS）、X射线断层扫描、拉曼光谱、扫描电子显微镜（SEM）以及结合先进加工工具的原位拉伸试验，研究了基于超高分子量聚乙烯（UHMWPE）的自增强复合材料（SRCs）的结构，以确定一方面加工条件与另一方面分子结构和力学性能之间的相关性。通过在不添加聚合物基体或软化剂的情况下，在不同压力和温度组合下对UHMWPE纤维进行热压实来制备SRCs。通过WAXS发现，较高的压实温度导致纤维更广泛地熔化，反映分子取向程度的赫尔曼因子相应降低，而在给定温度下，热压实压力的增加抑制了SRCs内纤维的熔化。X射线断层扫描证明不存在孔隙率，而对纵向和垂直纤维取向的偏振光拉曼光谱测量定性地显示了SRC样品的各向异性。SEM显示，基体由SRCs中纤维之间截留的熔融聚合物夹层形成。此外，原位拉伸试验表明，随着温度升高，杨氏模量和拉伸强度增加。
