气相色谱法研究聚辛烯-1与不同溶剂的热力学相互作用

用气相色谱法测定了聚辛烯－１与８种溶剂的Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ相互作用参数χ１和聚辛烯－１的溶解度参数，确定了χ１与温度的数学关系式。测定结果表明聚辛烯－１溶于正辛烷是一个放热过程。

Study on Thermodynamic Interactions Between Polyoctene 1 and Solvents Using Gas Chromatography

Polymer of long chain alpha-olefins is a kind of comb-like polymer with special properties. In this paper, the thermodynamic interactions of polyoctene-1 with eight solvents have been studied by using gas chromatography. The eight Flory-Huggins interaction parameters chi 1 were calculated. The results indicated that chi 1 decreases with increase of the carbon number of linear alkane, but when the carbon number is larger than 8, chi 1 tends to increase with the carbon number. It was also shown that the interaction of polyoctene-1 with cyclohexane is the strongest among all the studied solvents, and that with n-octane is the strongest among the linear alkanes. The relation of interaction parameter (polyoctene-1/n-octane) with temperature T was also determined: chi 1 = 1.697-523.1/T. It was shown that the dissolution of polyoctene-1 in n-octane is an exothermic process with an enthalpy change of -4.84 kJ/mol. The solubility parameter delta 2 of polyoctene-1 is 27.42 (J/mL)1/2, determined from the interaction parameters chi 1.