致孔剂对多孔酚醛树脂微球粒径的影响及热性能分析

摘要

Under the Condition of NaOH Catalyst, the porous phenolic microspheres (PF microspheres) were pre-pared by phenol and formaldehyde as monomer, suspension polymerization with water as dispersate medium, polyvinyl alcohol as dispersant, and toluene Di-2-ethylhexyl phthalate, or octadecanol as porogenic agent. The influence of porogenic agents on the particle size and particle size distribution was discussed, and thermal Prop-erty of PF microspheres (toluene combined with octadecanol) were tested. It was found from experiments that mi-crospheres with higher yield and even particle size was prepared by mixture porogenic agent (toluene combined with DOP or octadecanol). The differential scanning calorimeter(DSC) and thermal gravimetric analysis(TGA) in-dicated that the temperature at which greater mass loss of PF microspheres was 450 ℃. The analysis showed that the PF microspheres exhibited a better thermal stability.%以苯酚、甲醛为单体，水为分散介质，PVA1788为分散剂，甲苯、DOP、十八醇等为致孔剂，在NaOH催化条件下，采用悬浮缩聚法制备了多孔酚醛树脂微球（PF微球）。讨论了致孔剂种类及用量对酚醛树脂微球粒径及其分布的影响，测试了甲苯与十八醇配伍制的PF微球的热性能。通过实验发现，在混合致孔剂（甲苯分别于DOP、十八醇配伍）条件下的微球产率较高，粒径均一；甲苯+十八醇致孔剂条件下的PF微球在450℃后才发生较大的热失重，热稳定性能较好。