以聚乙二醇、液化二苯基甲烷二异氰酸酯为主要原料，采用一步发泡法制备聚乙二醇基聚氨酯形状记忆泡沫（SMPF），考察了水（发泡剂）用量对SMPF形态结构、密度、热性能和形状记忆性能的影响。结果表明，随着水用量的增加，SMPF泡孔孔径先增大后减小，密度先减小后增大；聚乙二醇软段结晶熔融温度由40.2℃增大至53.1℃，SMPF起始热分解温度由318.0℃减小至297.3℃；形状固定率（R_f）逐渐降低，热激发形状回复率（R_r热）和水激发形状回复率（R_r水）均呈现先减小后增大的变化规律，且当水用量≤1.5 phr时，R_f和R_r均大于80%。

Shape memory polyurethane foams (SMPFs) are prepared through one-step foaming method with polyethylene glycol and liquefied diphenylmethane diisocyanate as main raw materials.The effect of water (foaming agent) dosage on SMPF's morphological structure,density,thermal properties and shape memory properties is studied.It is shown that with the increasing of water dosage,the pore size of SMPF increases firstly and decreases then,while the density decreases firstly and increases then.The crystallization melting temperature of polyethylene glycol soft segment increases from 40.2℃ to 53.1℃,and the initial thermal decomposition temperature of SMPF decreases form 318.0℃ to 297.3℃.SMPF's shape fixity ratio (R_f) drops gradually,and its shape recovery ratios of heat-triggered (R_r-heat) and water-triggered (R_r-water) decrease firstly and increase then.Both R_f and R_r are larger than 80% when water dosage is not larger than 1.5 phr.

谢贵堂(1995-),男,硕士研究生,主要从事聚氨酯泡沫材料研究,buctxgt@163.com