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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis, characterization, and swelling responses of poly(N-isopropylacrylamide)- and hydroxypropyl cellulose-based environmentally sensitive biphasic hydrogels
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Synthesis, characterization, and swelling responses of poly(N-isopropylacrylamide)- and hydroxypropyl cellulose-based environmentally sensitive biphasic hydrogels

机译：聚（N-异丙基丙烯酰胺）-和羟丙基纤维素基环境敏感双相水凝胶的合成，表征和溶胀响应

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Thermosensitive networks based on hydroxypropyl cellulose and N-isopropylacrylamide crosslinked with N,N-methylene bisacrylamide were synthesized by a simultaneous gamma radiation technique. The network yield was optimized by the variation of reaction parameters such as the total radiation dose, concentration of crosslinker and monomer, and amount of water. The hydrogels had a biphasic structure and good mechanical strength, even in the fully swollen state, and could be synthesized in any shape and size. Volume transitions as a function of time and temperature were studied for these hydrogels in water, and the effects on swelling in different media such as 0.5N NaOH, 0.5N HCl, and 5% NaCl at the optimum time and temperature were also studied. The response of the hydrogels to these diverse changes in the swelling media was observed, and the volume transitions due to environmental changes in the hydrogels were not sharp and discontinuous as a maximum volume collapse occurred at a temperature higher than the reported lower critical solution temperature of 32.5degreesC for N-isopropylacrylamide. These hydrogels were environmentally sensitive and responded to changes in their thermal and ionic environment and have potential applications in diverse fields such as drug delivery, enzyme technology, and environmental management. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 479-488, 2004. [References: 16]
机译：通过同时伽马辐射技术合成了基于羟丙基纤维素和与N，N-亚甲基双丙烯酰胺交联的N-异丙基丙烯酰胺的热敏网络。通过改变反应参数（例如总辐射剂量，交联剂和单体的浓度以及水的量）来优化网络产量。该水凝胶即使在完全溶胀的状态下也具有两相结构和良好的机械强度，并且可以以任何形状和大小合成。研究了这些水凝胶在水中的体积变化与时间和温度的关系，并研究了在最佳时间和温度下在不同介质（如0.5N NaOH，0.5N HCl和5％NaCl）中溶胀的影响。观察到水凝胶对溶胀介质中这些不同变化的响应，并且由于水凝胶中环境变化而引起的体积转变不是尖锐的和不连续的，因为最大体积塌陷发生在高于报道的较低临界溶液温度的温度下。 N-异丙基丙烯酰胺为32.5℃。这些水凝胶对环境敏感，可响应其热和离子环境的变化，并在药物输送，酶技术和环境管理等不同领域具有潜在应用。 （C）2003 Wiley Periodicals，Inc. J Appl Polym Sci 91：479-488，2004。[参考：16]

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