摘要
用傅立叶变换红外光谱(FTIR)法研究了双酚A二缩水甘油醚环氧树脂(DGEBA)用低代端氨基聚(酯-胺)树枝状大分子G1.0(NH2)3、G1.5(NH2)8和聚(胺-酰胺)树枝状大分子PAMAM1.0(NH2)4作为固化剂的等温固化动力学,得到了不同温度下转化率与固化时间及反应速率与固化时间的关系。与小分子固化剂相比,端氨基树枝状大分子作固化剂时环氧基转化率在反应开始时增长得更快,较高代树枝状大分子在高温下固化环氧树脂时尤其如此。在相同温度和时间下,PAMAM1.0(NH2)4/DGEBA、G1.0(NH2)3/DGEBA、G1.5(NH2)8/DGEBA体系的转化率依次增大。进一步估算了3个体系在一定转化率下的固化反应表观活化能。在相同转化率时,用G1.5(NH2)8、PAMAM1.0(NH2)4、G1.0(NH2)3作固化剂的体系表观活化能依次减小。
Isothermal curing kinetics of diglycidyl ether of bisphenol A （DGEBA） epoxy resin with low generation amino group-terminated poly （ester, amine） dendrimers G1.0 （NH2）3, G1.5 （NH2）s and poly （amino-amide） dendrimer PAMAM1.0 （NH2）4 as hardeners was studied by means of fourier transform infrared spectroscopy （FTIR）. Relations between degree of conversion and curing time, as well as reaction rate and curing time at different isothermal temperatures were obtained. Compared with small molecular hardeners, amino group-terminated dendritic ones make degree of conversion increase faster at the beginning of the curing reaction, which is especially obvious for high generation dendritic hardeners at high temperature. Degree of conversion for PAMAM1.0（NH2）4 / DGEBA, G1.0（NH2）3/ DGEBA, G1.5（NH2）8/ DGEBA systems rises successively at the same temperature and time. Apparent activation energys for 3 systems at different degrees of conversion were estimated. At the same degree of conversion, the apparent activation energy for systems with G1.5（NH2）8, PAMAM1.0（NH2）4, G1.0（NH2）3 used as hardeners decreases in proper order.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2006年第3期385-389,共5页
Journal of Chemical Engineering of Chinese Universities
基金
苏州大学青年基金(Q3109205)
苏州大学第四批优秀骨干教师培养人选科研资助经费(R2317144)
