Chinese Journal of Magnetic Resonance ›› 2015, Vol. 32 ›› Issue (1): 23-32.doi: 10.11938/cjmr20150103

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Solid-State NMR Studies on the Structure and Confined Segmental Dynamics of PMMA Nanocomposite

LIU Yuan,CHEN Sheng-li,WU Qiang,CHEN Tie-hong,SUN Ping-chuan*   

  1. Key Laboratory of Functional Polymer Materials of Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2014-05-01 Revised:2015-01-14 Online:2015-03-05 Published:2015-03-05
  • About author:*Corresponding author:SUN Ping-chuan, Tel: +86-022-23508171, E-mail: spclbh@nankai.edu.cn.
  • Supported by:

    国家自然科学基金资助项目(21174072),高等学校仪器设备共建共享资助项目(CERS-1-61).

Abstract:

Solid-state NMR techniques were used to study the structure and confined dynamics of poly-methyl methacrylate (PMMA)/laponite nanocomposite. 1H magic angle spinning (MAS) spectra and relaxation experiments indicate that organic modifiers (AIBA) interact strongly with laponite nano-sheets, and the structure of PMMA nanocomposite is homogenous at the scale of several nanometers. The results of 13C spin-lattice relaxation times (T1,C) experiments indicate that mobility of the PMMA segments, especially the carbonyl groups, in nanocomposite decreases under the confinement of laponite nano-sheets. 13C SUPER experiments further indicate that the incorporation of laponite induce a slight change of the CSA line shape of PMMA carbonyl groups.

Key words: solid-state NMR, structure, dynamics, PMMA, laponite, nanocomposite

CLC Number: