Front Cover: Conceiving a semicrystalline polymer as a composite system of pure amorphous and crystalline phases, for the first time—in article number 2000151 by Masoud Razavi and Shi‐Qing Wang—decoupling of the yielding of each phase during deformation is identified. It is indicated that the yield of the amorphous phase, i.e., increased segmental mobility, is a prerequisite for the yield of the crystalline phase, i.e., destruction of crystalline structure.

中文翻译：

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半结晶聚合物变形的双屈服

前盖：首次将半结晶聚合物构想为纯非晶相和结晶相的复合系统-Masoud Razavi和Wang Shi-Qing Wang在文章编号2000151中首次确定了变形过程中各相屈服的解耦。已经表明，非晶相的产率，即增加的片段迁移率，是结晶相的产率，即破坏晶体结构的先决条件。