甲阶酚醛树脂-硼酸盐水凝胶的热可逆性研究  

Study on thermoreversibility of phenol formaldehyde resin-borate hydrogels

作　　者：谭晓明[1] 柳林[1] 崔崑[1] 黄乃瑜[1] 彭爱萍[2] 

机构地区：[1]华中科技大学材料科学与工程学院塑性成型模拟及模具国家重点实验室,湖北武汉430074 [2]孝感学院化学系,湖北孝感432100

出　　处：《石化技术与应用》2005年第4期261-263,共3页Petrochemical Technology & Application

基　　金：中国博士后基金项目(2003034472)

摘　　要：通过测定凝胶的融化温度(T),研究了甲阶酚醛树脂(PF)-硼砂(SB)水凝胶的热可逆性,还研究了PF树脂、SB和KOH浓度对T的影响。结果表明:体系的温度升高和降低时,凝胶可发生热可逆溶胶-凝胶相互转变;T与PF、SB及KOH浓度有关,PF浓度增大,T逐渐升高,KOH浓度增大,T逐渐降低,SB浓度增大时T先增大后减小,c(SB)为0.225mol/L时T出现极大值。根据Eldridge-Ferry理论,利用c(SB)与T之间关系,计算结果表明,凝胶的融化焓变△H为-45.81kJ/mol。The thermoreversibility of phenol formaldehyde resin - borate hydrogels as a function of polymer concentration, sodium tatroborate concentration and KOH concentration was investigated by the gel - melting temperatures. The results showed that the systems underwent the sol-gel transition with the increase and decrease of the temperature. The system was a new theroreversible hydrogels. The gel-melting temperature increased with the increase of the resin concentration, but decreased with the increase of the KOH concentration. At a given concentration of resin and KOH, the gel -melting temperature increased first then decreased with the sodium tatroborate concentration. By a modified Eldridge -Ferry theory, the enthalpy of gel - melting was estimated to be around-45.81 kJ/mol.

关 键 词：甲阶酚醛树脂 硼砂 水凝胶 融化温度 热可逆性 融化焓变 

分 类 号：TQ323.1[化学工程—合成树脂塑料工业]