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Macromolecular Research

, Volume 19, Issue 2, pp 156–165 | Cite as

RETRACTED ARTICLE: Microstructure of poly(vinyl acetate)-block-poly(methyl acrylate-co-methyl methacrylate) block terpolymers. 2D NMR and thermal study

  • Mahdi Moeud Ajjalallah
  • Mohammad Reza Rostami Daronkola
Articles

Abstract

Structural analysis of the poly(vinyl acetate)-block-poly(methyl acrylate-co-methyl methacrylate) with different MA/MMA ratios was characterized by 1D and 2D NMR. The effect of the sequence distribution, composition and stereoregularity on the unknown signals of α-CH3, backbone methylene and methin carbons were analyzed by 1D (13C/DEPT-135) and 2D HSQC NMR. Furthermore, the theoretical values of triad, dyad and triad fractions of these carbons confirmed the spectral assignments. The sensitivity of the vicinal and geminal couplings of methin and methylene protons to the sequence distribution and composition were characterized using the 2D TOCSY NMR method. The influence of the sequence distribution on the theoretical glass transition temperatures of the MA/MMA copolymers was also examined using the Johnston (extended Fox) equation and experimental T g .

Keywords

2D NMR block terpolymer microstructure sequence distribution glass transition temperature 

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Copyright information

© The Polymer Society of Korea and Springer Netherlands 2011

Authors and Affiliations

  • Mahdi Moeud Ajjalallah
    • 1
  • Mohammad Reza Rostami Daronkola
    • 1
  1. 1.Polymer Group, Chemical Engineering DepartmentTarbiat Modares UniversityTehran I.R.Iran

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