School of Sciences, Wuhan University of Technology, Wuhan, Hubei, 430070, China; Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry, Zhengzhou, 450002, China.
Center for High Pressure Science and Technology Research, Zhengzhou University of Light Industry, Zhengzhou, 450002, China.
Carbohydr Polym. 2018 Jun 15;190:190-195. doi: 10.1016/j.carbpol.2018.02.078. Epub 2018 Feb 24.
Gelation of methylcellulose aqueous solution was investigated by a high-pressure viscosity measurement device which consisted of diamond anvil cell, microscope and CCD. And the temperature and pressure dependence of the viscosity of methylcellulose aqueous solution was measured utilizing a rolling-ball technique. The results showed that sol-gel thermal transition of methylcellulose solution occurred at the temperature of 53 °C under atmospheric pressure. Upon compression, it was indicated that the viscosity showed a dramatic change in the vicinity of the pressure of 500 MPa. Parabolic phase diagram of methylcellulose aqueous solution was constructed, and it showed that the melting point was an increasing function of pressure at the first stage and an decreasing function of pressure at the final stage. The mechanism of sol-gel transformation of methylcellulose aqueous solutions was also discussed, it might be assumed that both hydrogen and hydrophobic bonds were involved with the gel formation in the case of methylcellulose aqueous solution.
利用高压粘度测量装置（由金刚石压腔、显微镜和 CCD 组成）研究了甲基纤维素水溶液的胶凝作用。利用滚球技术测量了甲基纤维素水溶液的粘度对温度和压力的依赖性。结果表明，在常压下，甲基纤维素溶液的溶胶-凝胶热转变发生在 53°C 的温度下。在压缩过程中，表明在 500 MPa 左右的压力下，粘度发生了显著变化。构建了甲基纤维素水溶液的抛物线相图，表明在第一阶段，熔点是压力的增函数，在最后阶段，熔点是压力的减函数。还讨论了甲基纤维素水溶液溶胶-凝胶转变的机理，推测在甲基纤维素水溶液的情况下，凝胶的形成既涉及氢键也涉及疏水键。
