Volume phase transition and structure of poly(N-isopropylacrylamide) microgels studied with1H-NMR spectroscopy in D2O
✍ Scribed by Mirja Andersson; Sirkka Liisa Maunu
- Publisher
- Springer
- Year
- 2006
- Weight
- 249 KB
- Volume
- 285
- Category
- Article
- ISSN
- 0340-255X
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## Abstract Phase transition and mobility of poly(__N__‐isopropylacrylamide) (PNIPA) chains with three different types of end groups (hydroxyl, carbon–carbon double bond, and camphoric sulfonic groups) have been studied by measurements of the normal ^1^H NMR spectrum, spin–spin relaxation time, and
The macroscopic volume shrinkage and swelling of poly (N-isopropylacrylamide) (PNIPA) gel induced by the compositional change in the methanol-water mixed solvent is correlated to the change in the nanoscopic free volume size and numerical concentration formed in the PNIPA gels. The free volume size