Quantitative Determination of Phase Content in Multiphase Polymers by Combining Spin-Diffusion and CP-MAS NMR
Quantitative Determination of Phase Content in Multiphase Polymers by Combining Spin-Diffusion and CP-MAS NMR
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DOI：
10.1021/ma0707786
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发表时间：
2007-06
期刊：
影响因子：
5.5
通讯作者：
L. Zhang;Z. Liu;†. A. Q. Chen;E. Hansen
中科院分区：
文献类型：
--
作者：
L. Zhang;Z. Liu;†. A. Q. Chen;E. Hansen
我们提出了一种新的方法来确定定量相含量的多相聚合物通过应用自旋扩散脉冲序列（过滤器）之前，交叉极化（CP）在13 C-CPAS实验。该技术是两个相当不同的聚合物系统，高密度聚乙烯（HDPE）和四个苯乙烯-异戊二烯二嵌段共聚物，所有已知的相含量的例子。原则上，该技术应该适用于任何多相系统，其中存在不同区域/相之间的自旋扩散，并且其中可以选择性地滤除相的磁化。
We present a new approach to determine quantitatively the phase content of multiphase polymers by applying a spin-diffusion pulse sequence (filter) prior to cross-polarization (CP) in a 13C-CPAS experiment. The technique is exemplified for two rather different polymer systems, a high-density polyethylene (HDPE) and four styrene−isoprene diblock copolymers, all of known phase contents. In principle, the technique should be applicable to any multiphase system in which spin-diffusion between different regions/phases exists and where the magnetization of phases can selectively be filtered out.