1988 Fiscal Year Final Research Report Summary
Characterization of Polymers by Use of New NMR Techniques
| Project/Area Number |
61430021
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子物性
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| Research Institution | Hokkaido University |
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Principal Investigator |
HIKICHI Kunio Department of Polymer Science,Faculty of Science,Hokkaido University, 理学部, 教授 (30000805)
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| Co-Investigator(Kenkyū-buntansha) |
TSUDA Sakae High Resolution NMR Laboratory,Faculty of Science,Hokkaido University, 理学部, 教務職員 (70211381)
TOKITA Masayuki Department of Polymer Scinece,Faculty of Science,Hokkaido University, 理学部, 助手 (80163963)
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| Project Period (FY) |
1986 – 1988
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| Keywords | Stereoregularity / vinyl polymers / poly(vinyl alcohol) / poly(vinyl chloride) / poly(acryl amide) / 1H NMR / 13C NMR / 2次元NMR |
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| Research Abstract |
The putpose of this research is to establish a new method for characterizing polymers by use of the new NMR techniques. For the past three years we have been studying methodology which does not depend on empirical knowledge and uses twodimensional NMR methods. We propose a new method for characterization of vinyl type synthetic polymers. The method is as follows; (1) measure 1H J-resolved 2D spectra, obtain different chemical shifts for methins and methylenes, and disclose equivalent methylenes, (2) measure broad-band decoupled 1H COSY and correlate methin and methylene peaks with reference of the connectivity, (3) measure CHCOSY and assign 13C resonances through the results of 1H assignments, (4) measure INADEQUATE 2D spectra to assign 13C resonances in detail, and (5) characterize configurations from 13C resonances with help of determined assignments. The conventional method is baed on the assumption of a statistical distribution of configurations. The present method can be applied to resonances which can not be determined by the conventional method. So far, we have successfully studied poly(vinyl alcohol), poly(acryl amide), and poly(vinyl chloride). INADEQUATE 2D experiments are useful for determination of the distribution of comonomers in ethylene propylene copolymers. A newly developed HMQC method is quite helpful for correlating 1H and 13C resonances.
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