Branch Content of Metallocene Polyethylene
Branch Content of Metallocene Polyethylene
复制标题
茂金属聚乙烯的支链含量
DOI：
10.1021/ma900199t
复制
发表时间：
2009
期刊：
影响因子：
5.5
通讯作者：
V. Galiatsatos
中科院分区：
文献类型：
--
作者：
Ramnath Ramachandran;G. Beaucage;A. Kulkarni;D. Mcfaddin;J. Merrick;V. Galiatsatos
采用小角中子散射 (SANS) 研究茂金属催化聚乙烯 (PE) 的结构和长链支化 (LCB) 含量。将一种新颖的缩放方法应用于 SANS 数据，以确定 PE 中 LCB 的摩尔分数支链含量 (phibr)。该方法还提供每条链的平均分支站点数 (nbr) 和每条最小路径的平均分支站点数 (nbr,p)。这些结果得出平均分支长度 (zbr) 和内部片段数量 ni，从而进一步了解链结构。该方法阐明了支化聚合物的结构和流变性质之间的关系。该 SANS 方法是拓扑复杂大分子的分支对分支结构和平均分支长度的唯一分析测量方法。
Small-angle neutron scattering (SANS) is employed to investigate the structure and long-chain branch (LCB) content of metallocene-catalyzed polyethylene (PE). A novel scaling approach is applied to SANS data to determine the mole fraction branch content (ϕbr) of LCBs in PE. The approach also provides the average number of branch sites per chain (nbr) and the average number of branch sites per minimum path (nbr,p). These results yield the average branch length (zbr) and number of inner segments ni, giving further insight into the chain architecture. The approach elucidates the relationship between the structure and rheological properties of branched polymers. This SANS method is the sole analytic measure of branch-on-branch structure and average branch length for topologically complex macromolecules.