Abstract High toughened polymeric materials have a wide application in many fields. Poly(methyl methacrylate) (PMMA) is a typical brittle polymer and it has been difficult to prepare high toughened PMMA material for a long time. To work on this issue, co-continuous phase structure was devised in PMMA/chlorinated polyethylene (CPE) blends through controlling the interfacial tension and viscosity in this work, resulting in the pronounced enhancement of impact toughness. The notched impact strength of co-continuous blends with 40 wt% CPE was up to 28.5 kJ/m2, increased by 26 times compared with pure PMMA. Selective extraction experiments, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) showed that the CPE network was thin and weak when CPE addition was low, but became dense and strong once the content was more than 20 wt%. Two toughening mechanisms, i.e. cavitation and shear yielding, were put forward based on the micrographs of impact-fractured surfaces and double-notch four-point-bending test. This work may broaden the application prospects of PMMA and provide a new strategy to prepare high toughened polymeric materials through fabricating co-continuous in polymer blends.

中文翻译：

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熔体加工中形成的共连续相结构诱导剪切带防止裂纹扩展：显着提高 PMMA 的冲击韧性

摘要 高韧性高分子材料在许多领域有着广泛的应用。聚甲基丙烯酸甲酯（PMMA）是一种典型的脆性聚合物，长期以来一直难以制备高韧度的PMMA材料。为了解决这个问题，在这项工作中，通过控制界面张力和粘度，在 PMMA/氯化聚乙烯 (CPE) 共混物中设计了共连续相结构，从而显着提高了冲击韧性。40 wt% CPE 的共连续共混物的缺口冲击强度高达 28.5 kJ/m2，与纯 PMMA 相比提高了 26 倍。选择性提取实验、扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDS) 表明，当 CPE 添加量低时，CPE 网络薄且弱，但一旦含量超过 20 wt%，就会变得致密和坚固。根据冲击断裂表面显微照片和双缺口四点弯曲试验，提出了空化和剪切屈服两种增韧机制。这项工作可能拓宽 PMMA 的应用前景，并为通过在聚合物共混物中制造共连续制备高韧性聚合物材料提供新的策略。