聚合物聚苯乙烯溶度参数测定实验的优化

Optimization of Experiments for Determining Solubility Parameters of Polymer Polystyrene

溶度参数是溶剂溶解聚合物能力的重要判据之一,用来判断聚合物在溶剂中的溶解性,在聚合物理论研究、涂料配方设计、树脂改性等方面有重要意义,因此,如何准确测定聚合物溶度参数非常重要。测定聚合物溶度参数的方法有多种,如黏度法、溶胀法、浊度滴定法、估算法等,本实验采用最经典的方法浊度滴定法。该方法测定聚苯乙烯的溶度参数常用氯仿作溶剂,由于氯仿属于易制毒化学品,所以选用溶度参数相近的乙酸乙酯作为替代溶剂。实验证明,替换溶剂后该实验仍能达到相同的教学目的。

The solubility parameter is one of the important criteria for the ability of a solvent to dissolve a polymer.It is used to judge the solubility of a polymer in a solvent.It is of great significance in polymer theory research,coating formulation design,and resin modification.Therefore,how to accurately determine the polymer solubility parameters is particularly important.There are many methods for polymer solubility determination,such as viscosity method,swelling method,turbidity titration method,and estimation method.This experiment uses the most classic turbidity titration method.The method uses chloroform as the solvent to determine the solubility parameters of polystyrene.Because chloroform is a precursor chemical,ethyl acetate with similar solubility parameters is used as the alternative solvent.The experiment proves that the same teaching purpose can still be achieved after replacing the solvent.