摘要
用交联剂M（NH3）42＋（M2＋为Zn2＋、Cu2＋、Ni2＋和Co2＋）络合交联丙烯酸酯无皂水溶胶形成涂膜，用差示量热法和重量分析法考察了涂膜的交联程度，得出一致的结论，均表明交联剂Zn（NH3）42＋的交联效果最佳，适宜的交联固化条件是80℃加热30min；用透射电镜观察到Zn（NH3）42＋与丙烯酸酯水溶胶形成交联网状结构的过程；还用差示扫描量热法初步分析了交联反应的动力学，求出反应级数为3．3，活化能为34．0kJ·mol-1。
A copolymer containing hydrophobic monomers(styrene, methyl methacrylate and butyl acrylate)and hydrophilic momomer(acrylacrylic acid)was synthesized by solution polymerization,and then nentralized by N,N-diethylamino ethanol to form soap-free hydrosol.The hydrosol coating aould be prepared by mixing this hydrosol with the crosslinking agent M(NH3)42+ (M2+ could be either Zn2+,Cu2+. Ni2+ or Co2+). It was supposed that in the soapfree acrylate hydrosol/M(NH3)42+ mixed system, before heating,M2+ in the form of M(NH3)42+could not react with the hydrosol(P-COO-)completely leaving some _COO-free to stabilize the hydrosol, and after heating(or curing),M2+ could be set free from NHe ligand to join the coordination-crosslinking reaction with(P-COO-) forming network struture(P-COO-)n M2+.IR spectrographic analysis, fluorescence analysis and the linear sweep voltammetry plarogrphic analysis identified the existence of (P-COO-)nM2+ in the coating film.The crosslinking extent of the coating film was investigated by DSC and gravimetric analysis. All results indicated that the appropriate crosslinking agent was Zn(NH3)-2+ and the optimum curing condition was heating at 80℃ for 30 min. THe crosslinking process of the hydrosol with Zu(NH3)42+ was examined by TEM. The kinetics of the crosslinking reaction has been studied preliminarily by DSC showing that the reaction activation energy was 34.0kJ·mol-1 and the order of reaction was 3.3,indicating that the crosslinking reaction may be a rather complex reaction.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1999年第1期28-34,共7页
Acta Physico-Chimica Sinica
基金
广州市科技项目
中山大学基础性研究前沿项目
