Temperature dependence of free volume of polyacrylamide gels studied by positron lifetime measurements

DOI Web Site Web Site 被引用文献2件

この論文をさがす

説明

Abstract Changes of positronium (Ps) cavity radii in polyacrylamide and poly(N-isopropylacrylamide) gels were studied from 120 to 300 K by positron lifetime technique and it has been shown that the Ps cavity radius in the hydrogels changes by three or four stages. Temperature dependence of the Ps cavity radius exhibits variations similar to common polymers around the glass transition temperature. Hydrophilicity of the polymer chains significantly affects the Ps cavity radius just below 273 K. These results suggest an important role of free volume on the state of water in hydrogels.

収録刊行物

被引用文献 (2)*注記

もっと見る

キーワード

問題の指摘

ページトップへ