结晶动力学评价聚酰胺6/磺化聚苯乙烯(Mn,Na)盐共混物的相容性

Miscibility of Polyamide-6 with Manganese or Sodium Sulfonated Polystyrene Ionomers Evaluated by Isothermal Crystallization Dynamics

用DSC测定的方法在等温条件下研究了聚酰胺6/磺化聚苯乙烯钠盐共混物(PA-6/NaSPS)和聚酰胺6/磺化聚苯乙烯锰盐共混物(PA-6/MnSPS)的结晶动力学。对于PA-6/MnSPS共混物,结晶速率(G)和成核速率(N)既与过冷度(ΔT)有关又与共混物组成(φMnSPS)有关,而PA-6/NaSPS共混物的G和N仅与ΔT有关,与φNaSPS无关。对于PA-6/MnSPS共混物,化学势差(ΔTG=0.005/T0m)和结晶的表面自由能参数(K和S)随φMnSPS的增加而增加,而PA-6/NaSPS共混物的ΔTG=0.005/T0m、K和S几乎不随φNaSPS的变化而变化。这些都说明PA-6/MnSPS共混物是相容的,PA-6/NaSPS是不相容的。

The crystallization dynamics of polyamide-6 and a sulfonated polystyrene neutralized with sodium, manganese （ PA-6/NaSPS, PA-6/MnSPS ） was analyzed by DSC under isothermal conditions. The crystal growth rate（G） and the nucleation rate （N） depended on both the degree of supercooling （△T） and the blend weight fraction （φMnSPS） for PA-6/MnSPS blends. However, G and N of PA-6/NaSPS blends depended only on AT and was independent of φMnSPS. The △T/Tm^0 values obtained at the fixed G, which corresponded to the chemical potential difference between molecules in the liquid and the crystal state, and the surface free energy parameters （K and S ） of PA-6 crystals evaluated from G and N depended on φMnSPS for PA-6/MnSPS blends, although the △T/Tm^0 values and surface free energy parameters of PA-6/NaSPS was almost constant and independent of φMnSPS-These results suggest that PA-6/MnSPS blends are miscible but PA-6/NaSPS blends are immiscible.