期刊
EUROPEAN POLYMER JOURNAL
卷 45, 期 4, 页码 1086-1091出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2009.01.011
关键词
Methylcellulose; Poly(vinyl alcohol); Hydrogel; Dual phase; Thermosensitive; Reversible
资金
- Natural Science Foundation of Fujian Province of China [E0640005]
A novel dual phase concomitant, methylcellulose sol@poly(vinyl alcohol) (MC/PVA) hydrogel, was prepared via physical mixing and subsequent freezing/thawing. MC/PVA hydrogel was stable within a wide temperature range, and exhibited reversible thermoresponsivity. The initial sol-gel transition temperatures of MC/PVA hydrogels containing 40, 45 and 50 wt% MC were 45.9, 42.0 and 45.5 degrees C, respectively. It was found that the crystallinity of these samples was 41.1%, 38.3% and 40.3%, respectively; all of them were lower than that of MC and PVA. The thermal responding rates of MC/PVA hydrogel composed of 30, 40, 45 and 50 wt% MC were about 2.85, 3.17, 5.74 and 8.58%/min, respectively. The fluorescence micrograph and scanning electron microscopy of MC/PVA hydrogel revealed that the micro MC sol phases were dispersed in whole PVA network. Moreover, the thermal transition behavior and interior morphology of MC/PVA hydrogel could be tailored with its composition. (C) 2009 Elsevier Ltd. All rights reserved.
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