Graphical analysis in gels morphology I. General method
Graphical analysis in gels morphology I. General method
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DOI：
10.1295/polymj.32.807
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发表时间：
2000-01-01
期刊：
影响因子：
2.8
通讯作者：
Ushiki, H
中科院分区：
文献类型：
--
作者：
Hashimoto, C;Ushiki, H
提出了一种新的测量体积相变凝胶形态的图解分析方法。聚(N-异丙基丙烯酰胺)(PNIPA)凝胶在超过临界温度后会收缩并变白。美白慢慢消失，凝胶最终变得透明。这最后一个阶段被认为是平衡态。用电荷耦合器件(CCD)摄像机监测了盘状PNIPA凝胶的收缩和白化过程，并用一种新的图形分析方法从时间分辨图像中估计了凝胶的面积和白化程度。我们发现凝胶在美白过程中经历了两个步骤的收缩。为了拟合随时间变化的收缩过程，指数函数和拉伸指数函数之和在“X(2-)映射法”中是足够的。表征拉伸指数的指数被发现大于1。拟合参数的意义是基于皮肤层在第二次收缩时坍塌的假设来确定的。
A new graphical analysis method is proposed for measurement of gels morphology on volume phase transition. Poly(N-isopropylacrylamide) (PNIPA) gels shrink and become white after jumping above the critical temperature. Whitening slowly disappears and the gels become finally transparent. This final stage is regarded as the equilibrium state. The shrinking and whitening of disk-like PNIPA gels have been monitored using a Charge-Coupled Device (CCD) video camera, and both area and whitening of the gels have been evaluated from time-resolved images using a new graphical analysis method. We showed that gels underwent a two-step shrinking in synchronism with the whitening process. To fit the time-dependent shrinking process, the sum of exponential and stretched exponential functions was adequate using the "chi (2-)map method". The exponent characterizing the stretched exponential was found to be greater than one. The meaning of fitting parameters is determined on the assumption that the skin layer collapses in the second shrinkage.