Synthesis and properties of p(NIPA-co-NVP)/clay hydrogels by radiation polymerization

RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE

Synthesis and properties of p(NIPA-co-NVP)/clay hydrogels by radiation polymerization

SONG Hongyan，

YANG Mingcheng，

ZHU Chengshen，

HE Suqin，

GAO Ya

Nuclear Science and Techniques

Vol.18, No.1

pp.55-58

Published in print 20 Jan 2007

DOI：10.1016/S1001-8042(07)60019-0

CLC：TB833,O631

32800

In this study, hydrogels of P(NIPA-co-NVP)/clay were synthesized by γ-ray radiation. Different thermo-sensitive hydrogels were made under different experimental conditions such as dose, monomer ratio, and content of clay. X-ray diffraction shows that the layer distance between Na-clays is changed from 1.6 to 2.7 nm because Na-clay pieces can be intercalated or exfoliated by HTMAB, and that between P(NIPA-co-NVP)/Clay pieces is 3.4 nm. The swelling property tests show that the LCST of P(NIPA-co-NVP) is higher than PNIPA. With the increase of NVP content, LCST is higher. As the ratio of NIPA/NVP is 95/5, hydrogel shows the best swelling property and LCST is 37°C. LCST of P(NIPA-co-NVP)-clay hydrogel is not changed, but the strength and swelling properties are better.

Thermo-sensitive hydrogelsCopolymer hydrogelsRadiation polymerizationClayLower critical transition temperature (LCST)

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