摘要
以竹材液化物为原料,以氢氧化钠为催化剂,制备成热固性液化竹基酚醛树脂(PBF)。通过对PBF的合成,对其物理化学特性及液化竹基酚醛树脂泡沫塑料(PBFM)的热稳定性进行了研究。凝胶色谱分析表明,PBF树脂的重均分子量(M w)和分散度(M w/M n)都高于常规酚醛树脂(PF)。PBFM的密度和压缩强度都高于常规PF泡沫。通过对PBFM在不同固化温度条件下的热降解性能的研究发现,当固化温度从100℃升高到140℃时,泡沫体的失重率从45.31%降低到29.09%,热降解表观活化能从22.82 kJ/mol提高到31.03 kJ/mol,这说明适当地提高PBFM固化温度可以提高其耐热性。
A phenol-liquefied bamboo-based phenolic resin（PBF） was prepared by a reaction of liquefied bamboo and formaldehyde under alkaline conditions. The properties of co-condensated PBF resin and thermal stability of PBF foam（PBFM） were studied. GPC results show that the weight average molecular mass（Mw） and polydispersity index（Mw/Mn） of the PBF are higher than conventional PF. The obtained PBFM shows satisfactory densities and compressive properties, comparable to those of foams obtained from conventional PF. It is found that the weight loss rate is decreased from 45.31% to 29.09% and the apparent activating energy of thermal decomposition is increased from 22.82 kJ/mol to 31.03 kJ/mol, when the curing temperature is rised from 100℃ to 140℃. It indicates that properly increasing the PBFM curing temperature can improve its heat resistance.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2013年第11期14-18,共5页
Engineering Plastics Application
基金
国际合作项目(2011DFA32440)
国家自然科学基金项目(31200448)
