聚氯乙烯-聚氧乙烯共混物的反相色谱研究

用反相色谱研究了聚氯乙烯与聚氧乙烯的相容性,发现其共混物的比保留体积V_g23具有重量加和性,表明共混物可能发生了相分离。导出了相分离体系聚合物相互作用参数X₂₃的近似关系式:X₂₃=(X₁₂-X₁₃)²/2,由此式可以解释X₂₃对探针种类的依赖性。聚氯乙烯和聚氧乙烯共混体系的反相色谱实验结果基本符合这一关系式。

Study of Poly (vinyl chloride)-Poly(ethylene oxide) Interaction Parameter by Inverse Gas Chromatography

Polyvinyl chloride (PVC),polyethylene oxide(PEO) and their 50/50 blend were studied at 120℃ by inverse gas chromatography(IGC).The retention behavior was characterized for 36 probes.The IGC-derived PVC-PEOinteraction parameter X₂₃,which ranged from-01 to 0.6,showed an apparent dependence on the nature of the probe.Specific retention volumes V_g23 of the blend were found to be equal to the weight-average V_g values of the two polymers for most probes.It is suggested that there existed phase separation in the blend.For phase separation system an approximate equation X₂₃=(X₁₂-X₁₃)₂/2 was given in this paper.This equation was verified by IGCresults of poly(vinyl chloride)-poly(ethylene oxide) blends.The probe dependence of X₂₃ was well explained with this equation.