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用反相气相色谱法测定了聚氯乙烯(PVC)乙烯醋酸乙烯共聚物(EVA)共混体系中分子间表观热力学相互作用参数χ′23,并以χ′23为判定依据,研究了共混物的相溶性。初步探讨了共混物的组成、聚合物分子链结构、温度与χ′23的关系以及探针分子性质对χ′23参数的影响。结果表明:χ′23值能够准确有效地判定PVC与EVA共混物的相溶性,醋酸乙烯质量分数低的EVA与PVC的共混物是热力学不相溶的;而醋酸乙烯质量分数中等的EVA与PVC的共混物则具有部分相溶性。结果与其它方法得到的结论是一致的。
The intermolecular thermodynamic interaction parameter χ’23 of polyvinyl chloride (PVC) ethylene-vinyl acetate copolymer (EVA) blends was determined by reversed-phase gas chromatography. Based on χ’23, Blending compatibility. The composition of the blend, the molecular structure of the polymer, the relationship between the temperature and χ’23 and the influence of the molecular nature of the probe on χ’23 parameters were discussed. The results show that the χ’23 value can accurately and effectively determine the compatibility of PVC and EVA blends. The blends of EVA and PVC with low vinyl acetate content are thermodynamically incompatible. However, EVA with moderate vinyl acetate content Blend with PVC is partially compatible. The results are consistent with the conclusions obtained by other methods.