降低精密聚乙烯中的支化烷基频率：朝着更长的运行长度推进极限。
Decreasing the alkyl branch frequency in precision polyethylene: pushing the limits toward longer run lengths.
机构信息
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.
出版信息
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。
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