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A 13C PST/MAS NMR study of the structure and molecular motion of a crosslinked polymer in the gel phase

1993; Elsevier BV; Volume: 301; Linguagem: Inglês

10.1016/0022-2860(93)80239-r

1872-8014

Hidekazu Yasunaga, Isao Ando,

NMR spectroscopy and applications

Abstract 13 C pulse saturation transfer/magic angle spinning NMR spectra and 13 C spin-lattice relaxation times ( T 1 ) of poly(methacrylic acid) (PMAA)/water gel were measured as functions of the degree of swelling and the degree of crosslinking. From these results, it was found that the segmental motion of the side chains of the network polymer is faster than that of the main chain, and that an increase in the degree of crosslinking in the PMAA gel leads to an increase in restraint of the segmental motion of the network polymer even when the water content in the gel is constant.