拉伸力场对聚苯乙烯/聚酰胺6共混物泡沫隔热性能的影响

Effect of Elongational Force Field on Foam Heat Insulation Properties of Polystyrene/Polyamide 6 Blends

拉伸力场下制备聚苯乙烯/聚酰胺6(PS/PA6)共混物,并间歇发泡制备PS/PA6共混物泡沫。研究PS/PA6的不同配比以及拉伸力场对共混物泡沫泡孔结构和隔热性能的影响。结果表明:拉伸力场限制共混物基体分子链的运动,提高共混物的黏性、弹性和熔体强度,从而提高共混物的可发性。在拉伸力场的作用下,PA6相发生明显的取向,呈现纤维状结构,在PS基体中有序排列,且共混物熔体强度提高使气体损失减少。PS∶PA6质量比为8∶2时,与未加入拉伸力场相比,拉伸力场下制备的共混物泡沫体积膨胀率增加86.3%;热导率为30.37 mW/(m·K),较纯PS泡沫的热导率降低13.4%,隔热效果最好。

Polystyrene/polyamide 6(PS/PA6) blend was prepared under elongational force field, and PS/PA6 blend foam was prepared by batch foaming. The effects of different PS/PA6 ratios and elongational force fields on the cell structure and thermal insulation properties of the blend foam were studied. The results show that the elongational force field limits the movement of the polymer matrix molecular chain and improves the viscosity, elasticity, and melt strength of the blend,thereby improving the foamability of the blend. Under the action of the elongational force field, the PA6 phase shows the fibrous orientation, and arranges orderly in the PS matrix. And the enhance of the melt strength of PS/PA6 blend can decrease the gas loss. When the mass ratio of PS to PA6 is 8∶2, the foaming volume expansion ratio of the blend prepared under elongational force field increases by 86.3% compared with that without elongational force field. And the thermal insulation of the blend foam is 30.37 m W/(m·K), which is 13.4% lower than that of pure PS foam, achieving the best thermal insulation properties.