We construct the global phase diagrams (GPDs) for polymer-solvent mixtures utilizing the modified Tompa model. We obtained the Griffiths shield regions (GSRs), the zones that coupling constants are almost equal, are obtained on the GPDs. We examine and discuss the influences of various segment sizes of polymer molecules on the GPDs and the GSRs. We observe that the GPDs are symmetrical around $\zeta =0$ for the equal-size segments of polymer molecules and the break down in the symmetric features of the GPDs rises as differences of segments of polymer molecules rise. Moreover, the types IV*, VI and VII phase behaviors are seen for differences of segments of polymer molecules in addition to the types I, I-A, II, II-A, III, III-HA, IV, V and V-A according to the van Konynenburg and Scott phase behavior classification. It is also observed that differences in the polymer molecules segments effect on the sizes of the phase type domains and the types of phase behaviors.

我们利用改进的 Tompa 模型构建了聚合物-溶剂混合物的全局相图 (GPD)。我们在 GPD 上获得了格里菲斯屏蔽区 (GSR)，即耦合常数几乎相等的区域。我们检查并讨论了聚合物分子的各种链段尺寸对 GPD 和 GSR 的影响。我们观察到 GPD 是对称的$\zeta =0$对于相同大小的聚合物分子链段，随着聚合物分子链段差异的增加，GPD 对称特征的破坏增加。此外，除了 I、IA、II、II-A、III、III-HA、IV、V 和 VA 型外，还可以看到 IV*、VI 和 VII 型相行为的聚合物分子链段的差异。 van Konynenburg 和 Scott 相行为分类。还观察到聚合物分子链段的差异影响相类型域的大小和相行为的类型。