Structure of ultrahigh‐molecular‐weight polyethylene in the solid state as studied by variable‐temperature 13C CP/MAS NMR spectroscopy
Structure of ultrahigh‐molecular‐weight polyethylene in the solid state as studied by variable‐temperature 13C CP/MAS NMR spectroscopy
复制标题
通过变温 13C CP/MAS NMR 光谱研究固态超高分子量聚乙烯的结构
DOI：
10.1002/polb.1990.090280411
复制
发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Hiroki Sato
中科院分区：
文献类型：
--
作者：
S. Akiyama;T. Kōmoto;I. Ando;Hiroki Sato
为了深入了解超高相对分子质量聚乙烯样品的结构，在23~−108°C的温度范围内进行了13C CP/MAS核磁共振实验，结晶组份的峰随着温度的降低而前移，这与以前报道的熔融结晶聚乙烯样品的情况相反。根据X射线衍射结果和量子化学计算，推测在低温下，亚甲基碳以扭曲的正交晶型存在。
In order to obtain some insight into the structure of an ultrahigh-molecular-weight polyethylene sample, 13C CP/MAS NMR experiments have been carried out at temperatures from 23 to −108°C. The peak for the crystalline component moves upfield with a decrease in temperature, which is contrary to what was reported previously for a melt-crystallized polyethylene sample. On the basis of x-ray diffraction results and quantum-chemical calculations, it is suggested that the methylene carbons are in the distorted orthorhombic form at low temperatures.