1-1.phase diagrams The compatibility of polymer blends can be explained by thermodynamics of mixing. Usually the stable equilibrium of thermodynamics is not realized in mixing. Polymer incompatibility arises from the very small entropy gained by mixing different kinds of long chains.In fact,it will be shown that In the limit of high molecular weight and high adhesion,only polymer pairs with zero or negative heats of mixing form one phase
The compatibility of polymer blends can be explained by thermodynamics of mixing. Usually the stable equilibrium of thermodynamics is not realized in mixing. Polymer incompatibility arises from the very small entropy gained by mixing different kinds of long chains. In fact, it will be shown that In the limit of high molecular weight and high adhesion, only polymer pairs with zero or negative heats of mixing form one phase. 1-1. phase diagrams
o Based on composition of elastomers in incompatibility blends the phase diagrams as follow:a.component A in A/B blend controlled(more than 70%), component B will be the dispersion phase.Otherwise the component A will be the dispersion phase.b.If the ratio of A/B is between 30/70 to 70/30,the phase A might be contained B and the phase B also contained A
⚫ Based on composition of elastomers in incompatibility blends the phase diagrams as follow: a. component A in A/B blend controlled(more than 70%), component B will be the dispersion phase. Otherwise the component A will be the dispersion phase. b. If the ratio of A/B is between 30/70 to 70/30, the phase A might be contained B and the phase B also contained A
Based on the compatibility of polymers the phase diagrams could be divided into five kinds: a.total incompatible polymer pairs;b.partial compatibility achieved by compatibilizer(增溶剂 in total incompatibility;c.compatible polymer pairs,d.semicompatible(半相容)polymer pairs, component A controlled; f. semicompatible polymer pairs,component B controlled;
Based on the compatibility of polymers the phase diagrams could be divided into five kinds: a. total incompatible polymer pairs; b. partial compatibility achieved by compatibilizer(增溶剂) in total incompatibility; c. compatible polymer pairs; d. semicompatible（半相容） polymer pairs, component A controlled; f. semicompatible polymer pairs, component B controlled;
1-2.Compatible effect by mixing temperature and component content Compatible effect by mixing temperature:based on low molecular weight polymers,the higher degree of compatibility as the higher temperature mostly.Based on high molecular weight polymer,the degree of compatible change of polymers is much different as the temperature increasing
1-2. Compatible effect by mixing temperature and component content ⚫ Compatible effect by mixing temperature: based on low molecular weight polymers, the higher degree of compatibility as the higher temperature mostly. Based on high molecular weight polymer, the degree of compatible change of polymers is much different as the temperature increasing
o a. There are a significantly effect (显著影响) to interdispersion(相互扩散) of polymer pairs by temperature.The more interdispersion the higher degree of compatibility between polymer pairs normally
⚫ a. There are a significantly effect （ 显 著 影 响 ） to interdispersion （ 相 互 扩 散 ） of polymer pairs by temperature. The more interdispersion the higher degree of compatibility between polymer pairs normally