o b.Compatible effect t by component content:at a definite temperature,there are a significant effect to compatibility of polymer blends by component content
⚫ b.Compatible effect by component content: at a definite temperature, there are a significant effect to compatibility of polymer blends by component content
Compatibility effect by molecular weight of components in blends.For example, R.kuhn et al studied the phase relationships of polystyrene-poly(methyl methacrylate by employing an ingenious((敏捷)dilute solution light scattering technique.(稀释溶液光散射技术)
⚫ Compatibility effect by molecular weight of components in blends. For example, R.kuhn et al studied the phase relationships of polystyrene-poly(methyl methacrylate ) by employing an ingenious(敏捷) dilute solution light scattering technique.(稀释溶液光散射技术)
equations derived from phase separation quantities could be extrapolated(推理)to the pure phases, yielding the conclusion that if both polymers had molecular weight less than about 30000-40000,the materials would form a single phase.Above this molecular weight,two phases would be formed
equations derived from phase separation quantities could be extrapolated（推理） to the pure phases, yielding the conclusion that if both polymers had molecular weight less than about 30000-40000, the materials would form a single phase. Above this molecular weight, two phases would be formed
1-3.Thermodynamics of mixing The important criteria(临界) for compatibility or incompatibility (one or two phases)is the thermodynamics of the molecular state of dispersion and of the adhesion between the two phases
1-3. Thermodynamics of mixing ⚫ The important criteria （ 临 界 ） for compatibility or incompatibility (one or two phases) is the thermodynamics of the molecular state of dispersion and of the adhesion between the two phases
Equilibrium compatibility is related to the interaction forces,if AGmix is negative, compatibility occurs: AGmix =AH-TASmix -1-1 ●△Gmi-free energy of mixing(混合自由能)》 ●△Hmix-enthalpy of mixing(混合焓) o T -temperature of mixing ASmix-entropy of mixing (混合熵)
Equilibrium compatibility is related to the interaction forces, if ΔGmix is negative , compatibility occurs: ⚫ ΔGmix =ΔH-TΔSmix -1-1 ⚫ ΔGmix -free energy of mixing（混合自由能） ⚫ ΔHmix -enthalpy of mixing （混合焓） ⚫ T -temperature of mixing ⚫ ΔSmix-entropy of mixing （混合熵）