Dynamic behavior of water in hydro-swollen crosslinked polymer gel as studied by PGSE 1H NMR and pulse 1H NMR

✍ Scribed by H. Yasunaga; I. Ando

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 456 KB
• Volume: 1
• Category: Article
• ISSN: 0966-7822
• DOI: 10.1016/0966-7822(93)90013-8

✦ Synopsis

~H NMR measurements on spin-lattice relaxation time (Tz) and spinspin relaxation time (Te) were carried out on hydro-swollen crosslinked poly(methacrylic acid) (PMAA) gel to elucidate molecular motion of water molecules contained in the gel as a function of the degree of crosslinking. From these experimental results, it was found that I H T~ and Te decrease with an increase of the degree of crosslinking. This shows that molecular motion of water molecules is strongly restrained owing to crosslinking. Further, pulsed-field-gradient spin-echo I H NMR measurements were carried out to determine the self-diffusion coefficient of water molecules (DH2o contained in the PMAA gel at 300 K as a function of the degree of crosslinking. From these experimental results, it was found that the DH2o value decreases with an increase of the degree of crosslinking. This shows that translational molecular motion of water molecules is restrained by crosslinking.