Characterization of the microdomain structure in polystyrene-polyisoprene block copolymers by 1H spin diffusion and small-angle X-ray scattering methods
Characterization of the microdomain structure in polystyrene-polyisoprene block copolymers by 1H spin diffusion and small-angle X-ray scattering methods
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采用 1H 自旋扩散和小角 X 射线散射方法表征聚苯乙烯-聚异戊二烯嵌段共聚物中的微区结构
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
R. Register
中科院分区：
文献类型：
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作者：
K. Jack;Jiahu Wang;A. Natansohn;R. Register
对一系列不同分子量和分子结构的聚苯乙烯-聚异戊二烯嵌段共聚物进行了1H自旋扩散和小角X射线散射（SAXS）测量。在共聚物中的域的大小和界面相的厚度由自旋扩散测量使用明确考虑1H自旋晶格弛豫的影响的模型确定。通过NMR测定的界面相的厚度被发现是恒定的（约。3nm）。作为分子量的函数的域的大小和层间距离的变化被认为是在较好的协议与更成熟的SAXS方法所确定的。然而，通过NMR测量的层间距离被发现是一贯小于SAXS测量的，这种差异可能是由于在自旋扩散曲线的分析中使用的形态模型的简化。
1H spin diffusion and small-angle X-ray scattering (SAXS) measurements were carried out for a series of polystyrene−polyisoprene block copolymers of varying molecular weight and molecular architecture. The sizes of domains and the thickness of the interphase in the copolymers were determined from the spin diffusion measurements using a model which explicitly considers the effects of 1H spin−lattice relaxation. The thickness of the interphase determined by NMR was found to be constant (ca. 3 nm) for all of the copolymers. The variations in domain size and intersphere distance as a function of molecular weight were found to be in good agreement with those determined by the more established SAXS methods. However, the intersphere distances measured by NMR were found to be consistently smaller than those measured by SAXS, and this difference may be caused by simplifications in the morphological model used in the analysis of the spin diffusion curves.