蓖麻油基聚氨酯预聚体改性酚醛泡沫的制备及表征(英文)

Preparation and Characterization of Phenolic Foams Modified by Castor Oil-based Polyurethane Prepolymer

以蓖麻油（CTO）和1,6-己二异氰酸酯（HDI）为原料合成蓖麻油基聚氨酯预聚体（COPUP）,并采用COPUP对酚醛泡沫进行改性。通过FT-IR和1H NMR对COPUP结构进行了鉴定和表征,进一步采用SEM、万能试验机结合热重分析仪研究了COPUP添加量对酚醛泡沫的形态、机械性能和热稳定性的影响。结果表明：COPUP改性的酚醛泡沫泡孔均匀,但与纯酚醛泡沫相比,COPUP改性酚醛泡沫的泡孔较大,当COPUP添加量为10%时,泡沫的泡孔反而被破坏;当COPUP添加量为3%-7%时,改性酚醛泡沫与纯酚醛泡沫相比弯曲强度增加了21.05%-26.32%,比弯曲强度从5.90（kN·m）/kg增加到6.17（kN·m）/kg,高于纯酚醛泡沫4.96（kN·m）/kg;随着COPUP添加量的增加,泡沫的热稳定性略有下降。

Castor oil-based polyurethane prepolymer（COPUP） was prepared through the reaction of castor oil （CTO） with 1,6-hexamethylene diisocyanate（ HDI）, then COPUP was used to modify phenolic foams（PFs）. The structure of COPUP was confirmed by FT-IR and J H NMR. Morphological properties, mechanical properties and thermal stability of the copup-filled PFs were assessed by SEM, universal test and thermogravimetric analysis （TGA）. The cell shapes of the COPUP- filled PFs were approximately symmetrical, but the cell sizes were larger than that of pristine PF. Especially, when the cell sizes of PF modified with 10 % COPUP, it became obviously heterogeneous and the bubbles collapse. Compared with that of pristine PFs, the flexural strength of PFs filled with 3% - 7% COPUP increased about 21.05% - 26.32% ; and the corresponding specific flexural strength ranged from 5.90 to 6.17 （kN. m）/kg, which were significantly higher than that of the pristine PFs, 4.96（kN-m）/kg. The addition of COPUP caused the decrease of the thermal stability of PFs.