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Temperature and pH responsive behaviours of CMC/AAc hydrogels prepared by electron beam irradiation

机译：电子束辐照制备的CMC / AAc水凝胶的温度和pH响应行为

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The temperature and pH-responsive characters of hydrogels prepared from aqueous solutions containing 4.2 and 25% (w/v) carboxymethyl cellulose (CMC) and acrylic acid (AAc), respectively under the effect of accelerated electrons was investigated. Even though the initial content of hydrogels solution is constant, the swelling in water and responsive characters were greatly dependent on electron beam irradiation dose. In this regard, the percentage swelling in water of the hydrogel prepared at 50 kGy is relatively higher than that prepared at 80 kGy. However, both hydrogels displayed super water absorbing behaviour at room temperature in the range of similar to 3500-4600%. The hydrogels exhibit a relatively low tendency to swell in methanol with respect to water, in which the overall swelling in water is similar to 12 times that in methanol. The deswelling of the hydrogels at 40 degrees C in water from the equilibrium swelling state at 25 degrees C showed a lower rate than the swelling process. The results showed that the CMC/AAc hydrogel prepared at 50 kGy has a temperature-response character within the temperature range 25 + 15 degrees C at any time of swelling, while the hydrogel prepared at 80 kGy, does not show this character within this range of temperature. While the swelling of CMC/AAc hydrogel prepared at 50 kGy was found to substantially increase with increasing pH values from 3 to 10, the hydrogel prepared at 80 kGy was found to display pH responsive character below and above 7. (c) 2005 Elsevier B.V. All rights reserved.
机译：分别研究了由4.2和25％（w / v）的羧甲基纤维素（CMC）和丙烯酸（AAc）制成的水溶液在加速电子作用下的温度和pH响应特性。即使水凝胶溶液的初始含量是恒定的，水中的溶胀和响应特性在很大程度上也取决于电子束辐照剂量。在这方面，以50kGy制备的水凝胶在水中的溶胀百分比相对高于以80kGy制备的水凝胶。但是，两种水凝胶在室温下均显示出超强的吸水性能，范围接近3500-4600％。水凝胶在甲醇中相对于水表现出相对较低的溶胀趋势，其中在水中的总体溶胀类似于在甲醇中的十二倍。水凝胶在40摄氏度的水中从25摄氏度的平衡溶胀状态的溶胀显示出比溶胀过程更低的速率。结果表明，在溶胀的任何时间，以50 kGy制备的CMC / AAc水凝胶在25 + 15摄氏度的温度范围内均具有温度响应特性，而以80 kGy制备的水凝胶在此范围内则没有此特性。温度。虽然发现在50 kGy下制备的CMC / AAc水凝胶的溶胀随着pH值从3增加到10而显着增加，但在80 kGy下制备的水凝胶却显示出低于和高于7的pH响应特性。（c）2005 Elsevier BV版权所有。

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