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河北纤维素随着温度的变化有哪些反应?

2018年10月20日 点击数:161

河北纤维素的溶液处于低温时,大分子上的亲水基团和水分子之间存在氢键效果,为水分子围住而构成笼状布局。温度升高所施加的热量将会使得水分子和羟丙基甲基纤维素分子之间的氢键开裂,笼状的超分子布局被损坏,水分子从氢键效果的捆绑下释放出来变成自在水分子,而羟丙基甲基纤维素大分子链上的疏水的甲氧基基团则露出出来,这就使得疏水联系变成可能。温度进一步升高,结尾一切的氢键都开裂,其疏水联系到达最大程度,疏水聚集体的数量和尺度也随之添加。在此过程中,羟丙基甲基纤维素使用规模愈加广泛。尔后,不一样的疏水聚集体之间经过疏水效果开端发作联系。当温度升高到凝胶点时,疏水聚集体构成的三维网络布局充溢系统,微观上表现为凝胶的构成。


 When a solution of hydroxypropyl methyl cellulose at a low temperature, between hydrophilic group and water molecule hydrogen bonds on the macromolecules, which is surrounded by water molecules form a cage. The temperature of heat applied will be such that the water molecules and the hydrogen bonds between the molecules of hydroxypropylmethylcellulose, cage-like supramolecular structure is damaged, the water molecules are released from the effect of the hydrogen bound to become free water molecules and the hydrophobic methoxy group of hydroxypropyl methylcellulose on the macromolecular chains is exposed, which makes it possible to hydrophobic binding. The temperature is further increased, eventually all hydrogen bonds break, the maximum degree of hydrophobic binding, number and size of the hydrophobic aggregates increases. In this process, hydroxypropyl methyl cellulose wider range of applications. Thereafter, different binding hydrophobic aggregates began by hydrophobic interaction. When the temperature rises to the gel point, the three-dimensional network structure formed by the hydrophobic aggregates full system performance for the formation of macroscopic gel.