用Flory溶液理论推算聚合物的溶度参数

应用本文得到的Flory状态方程溶液理论中的交换能参数X_(12)和两组份接触表面之比s_1/s_2,结合Hildebrand-Scatchard(简称H-S)溶解度理论,推导出计算聚合物溶度参数δ_2的关系式。计算了聚二甲基硅氧烷(PDMS)、天然橡胶(NR)和聚异丁烯(PIB)的δ_2其结果与常规静态法得到的实验值、以及与动态的反相色谱法得到的结果符合,说明聚合物的δ_2与测定的浓度范围无关。此外,还应用反相色谱法测定了顺丁胶的δ_2。

Determination of Polymer Solubility Parameter by Flory Solution Theory

The new expression of calculating the polymer solubility parameter has been derived by combining Flory solution theory with Hildebrand-Scatchard solution theory in dilute solution. With the exchange energy parameter X_(12)obtained from interaction parameter by IGLC and parameter s_1/s_2, i. e. the ratio of contact surface areas for polymer and solvent, which is evaluated with the aid of Rondi's group contribution, the solubility parameters of polydimethylsiloxane(PDMS), natural rubber(NR) and polyisobutylene(PIB)have been calculated. The calculated values of δ_2 are in good agreement with those obtained from conventional static methods of viscosity and swelling, as well as obtained directly from inverse gasliquid chromatography (IGLC) in concentrated solution. It demonstrates that polymer solubility parameter is independent of the range of solution concentration in which δ_2 is determinated.Moreover, we measure the δ_2 of poly (cis-butadiene) by IGLC, the result is in excellent agreement with the observed static value.