An estimation of the number of tie molecules in semicrystalline polymers by means of neutron scattering
An estimation of the number of tie molecules in semicrystalline polymers by means of neutron scattering
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DOI：
10.1002/pol.1984.180220813
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发表时间：
1984-08
期刊：
影响因子：
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通讯作者：
E. W. Fischer;K. Hahn;J. Kugler;U. Struth;R. Born;M. Stamm
中科院分区：
文献类型：
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作者：
E. W. Fischer;K. Hahn;J. Kugler;U. Struth;R. Born;M. Stamm
本文提出了一种估算半结晶聚合物中子散射数据的新方法，适用于小的和中等的q [q =（4π/λ）sinθ/2]。它是基于这样的假设，即一般来说，一个分子在不同的层流中冷冻。在一个层片内，水晶茎通过分子内“簇”的环或折叠连接起来，分子内“簇”通过结分子连接起来。在没有进一步假设的情况下，该方法以直接的方式产生以下量：（i）每个分子的簇的平均数，由此可以估计结分子的数目;（ii）属于一个簇的茎的中心的回转半径;以及（iii）团簇中心相对于分子中心的回转半径，使用获得的实验数据成功地测试了该方法。由聚（环氧乙烷）、聚乙烯和全同立构聚丙烯制成。
A new method for the evalution of neutron scattering data from semicrystalline polymers is proposed for small and intermiediate q [q = (4π/λ)sinθ/2]. It is based on the assumption that, in general, a molecule cryustallizes in various lamellae. Within one lamella the crystalline stems connected by loop or folds from intramolecular “clusters,” which are connected by tie molecules. Without further assumptions the method yields in a straightforward manner the following quantities: (i) the average number of clusters per molecule, from which the number of tie molecules can be estimated; (ii) the radius of gyration of the centers of the stems belonging to one cluster; and (iii) the radius of gyration of the cluster centers with respect to the center of the molecule the method was successfully tested using experimental data obtained from poly(ethylene oxide), polyethylene, and isotactic polypropylene.