Solid State NMR Study of Starch-sodium Acrylate Grafted Copolymer

Abstract

Abstract: The domain-structure of a series of starch/poly(sodium acrylate) grafted samples, in comparison with starch, poly(sodium acrylate) and starch/poly(sodium acrylate) blend, was studied by high-resolution solid-state ¹³C NMR spectroscopy at room temperature. The crystallinity of starch was found to decrease greatly in the grafted and blended samples. The obtained values of ¹H spin-lattice relaxation time in rotating frame T_1ρ and ¹H spin-lattice relaxation time T₁ showed that the starch and poly(sodium acrylate) components in both grafted and blended samples have the compatibility on nanometer scale. In the ¹³C CP/MAS spectra, the chemical shift of the carbonyl group of poly(sodium acrylate) is found to be dependent on the composition of the grafted samples. This result indicates further that the starch and the poly(sodium acrylate) components of the grafted samples exhibita compatibility at the molecular level, which is better than that of the blend sample.

Key words: Starch/poly(sodium acrylate) graft copolymer, Phase structure, Solid-state high resolution ¹³C NMR, Spin-lattice relaxation time

CLC Number:

O636

TrendMD:

KONG Xu-Xin, XU Kun, WANG Pi-Xin, CHEN Qun. Solid State NMR Study of Starch-sodium Acrylate Grafted Copolymer[J]. Chem. J. Chinese Universities, 2005, 26(9): 1735.

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Solid State NMR Study of Starch-sodium Acrylate Grafted Copolymer

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