中文摘要：

固体核磁共振技术是研究半晶聚合物的局部和整体分子链运动的一种非常独特的手段。该文对近年来半晶聚乙烯分子链运动的固体核磁共振研究工作进行了综述，展示了如何应用先进的固体核磁共振技术获得半晶聚乙烯局部和长程分子链运动的详细信息。这些分子层次上的信息对加深聚乙烯宏观机械性质的理解具有非常重要的意义。

英文摘要：

Solid-state NMR offers a unique way to monitor the local and collective chain motions in semi-crystalline polymers. In this review paper, we will briefly survey recent results on the solid-state NMR study of chain motions in semi-crystalline polyethylenes （PEs）. We will demonstrate that the state-of-the-art solid-state NMR now can provide very detailed knowledge about the local and collective chain motions in semi-crystalline PEs, which is of great relevance to our understanding of the mechanical behaviors of polyethylene in the microscopic level.