Precise Molecular Weight Determination and Structure Characterization of End-functionalized Polymers: An NMR Approach <italic style="font-style: italic">via</italic> Combination of One-dimensional and Two-dimensional Techniques

Dong-xue Chen; Ling-feng Gao; Xiao-hong Li; Ying-feng Tu

doi:10.1007/s10118-017-1919-4

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Precise Molecular Weight Determination and Structure Characterization of End-functionalized Polymers: An NMR Approach via Combination of One-dimensional and Two-dimensional Techniques

Papers | Updated：2021-02-18

- Precise Molecular Weight Determination and Structure Characterization of End-functionalized Polymers: An NMR Approach via Combination of One-dimensional and Two-dimensional Techniques
- Chinese Journal of Polymer Science Vol. 35, Issue 5, Pages: 681-692(2017)
- Affiliations：
  
  Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
- Author bio：
  
  Xiao-hong Li (李晓虹), E-mail:lxh83@suda.edu.cn
  Ying-feng Tu (屠迎锋), E-mail:tuyingfeng@suda.edu.cn
- Funds：
- DOI：10.1007/s10118-017-1919-4
  CLC：
- Received：03 November 2016，
  
  Revised：2016-11-29，
  
  Accepted：29 November 2016，
  
  Published：2017-05
- Accepted：
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Dong-xue Chen, Ling-feng Gao, Xiao-hong Li, et al. Precise Molecular Weight Determination and Structure Characterization of End-functionalized Polymers: An NMR Approach via Combination of One-dimensional and Two-dimensional Techniques[J]. Chinese Journal of Polymer Science, 2017, 35(5): 681-692. DOI: 10.1007/s10118-017-1919-4.
DOI：

Dong-xue Chen, Ling-feng Gao, Xiao-hong Li, et al. Precise Molecular Weight Determination and Structure Characterization of End-functionalized Polymers: An NMR Approach via Combination of One-dimensional and Two-dimensional Techniques[J]. Chinese Journal of Polymer Science, 2017, 35(5): 681-692. DOI: 10.1007/s10118-017-1919-4. DOI：

摘要

Abstract

We present here the application of one-dimensional and two-dimensional NMR techniques to characterize the structure of methoxyl end-functionalized polystyrenes (PS). The peaks in

H-NMR spectra corresponding to main-chain

side-chain and chain-end groups are assigned by

H-

H gCOSY

H-

C gHSQC and gHMBC spectra. For the first time

the spin-lattice relaxation time (

) of protons of the chain-ends is revealed to be affected more by polymer molecular weight (MW) than by the protons of the main-chains and the side-chains (almost independent from MW). As a result

a much higher delay time (

1) for chain-ends (

) is needed for quantitative NMR measurement when using end-group estimation method to obtain the MW of PS

which is in accordance with the value estimated by GPC. An improved method for the polymer MW determination is established

by combination of different NMR techniques to distinguish the peaks

and a large

1 setting to achieve quantitative NMR analysis.

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references

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⁰

Precise Molecular Weight Determination and Structure Characterization of End-functionalized Polymers: An NMR Approach via Combination of One-dimensional and Two-dimensional Techniques

DOI：10.1007/s10118-017-1919-4

摘要

Abstract

关键词

Keywords

references