Center for Macromolecular Science and Engineering, The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA.
J Am Chem Soc. 2011 Aug 10;133(31):11872-5. doi: 10.1021/ja2040046. Epub 2011 Jul 19.
A symmetrical α,ω-diene monomer with a 36 methylene run length was synthesized and polymerized, and the unsaturated polymer was hydrogenated to generate precision polyethylene possessing a butyl branch on every 75th carbon (74 methylenes between branch points). The precision polymer sharply melts at 104 °C and exhibits the typical orthorhombic unit cell structure with two characteristic wide-angle X-ray diffraction (WAXD) crystalline peaks observed at 21.5° and 24.0°, corresponding to reflection planes (110) and (200), respectively.
合成并聚合了一种具有 36 个亚甲基重复单元的对称α,ω-二烯单体，将不饱和聚合物加氢得到精确的聚乙烯，每个 75 个碳原子上带有一个丁基支链（支链点之间有 74 个亚甲基）。这种精确聚合物在 104°C 下急剧熔化，表现出典型的正交晶胞结构，在 21.5°和 24.0°处观察到两个特征的广角 X 射线衍射（WAXD）结晶峰，分别对应于（110）和（200）反射面。
