Using 2D NMR to determine the degree of branching of complicated hyperbranched polymers |
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| Authors: | XinYuan Zhu Liang Chen Yan Chen DeYue Yan |
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| Affiliation: | (1) School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China;(2) Instrumental Analysis Center, Shanghai Jiao Tong University, Shanghai, 200240, China |
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| Abstract: | Degree of branching (DB) is a crucial structure parameter of hyperbranched polymers, which can be determined by 1H NMR, quantitative 13C NMR, degradative method, etc. However, for complicated hy-perbranched polymers, intricate structure and severe overlap of spectral signals hinder the determina-tion of DB using traditional methods. In this work, the architecture of complicated hyperbranched polymers has been elucidated with the help of 2D NMR techniques. Using such a method, overlapped NMR signals can be well separated into a two-dimensional space, and additional structural information is also available. Correspondingly, quantitative analysis for complicated systems can be realized. De-termination of DBs for three types of complicated hyperbranched polymers synthesized from step-polymerization, self-condensation vinyl polymerization and self-condensation ring-opening po-lymerization is shown as examples. |
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| Keywords: | hyperbranched polymer degree of branching 2D NMR |
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