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6615543 
Journal Article 
Coordination-crosslinking of acrylate copolymer soap-free hydrosol with metal ion 
Yang, LQ; Xie, ZM; Li, ZM; , 
1999 
Yes 
Acta Physico - Chimica Sinica
ISSN: 1000-6818 
PEKING UNIV PRESS 
BEIJING 
15 
1 
28-34 
Chinese 
WOS:000078475600006 
A copolymer containing hydrophobic monomers (styrene, methyl methacrylate and butyl acrylate) and hydrophilic monomer (acrylacrylic acid) was synthesized by solution polymerization, and then neutralized by N, N-diethylamino ethanol to form soap-free hydrosol. The hydrosol coating could be prepared by mixing this hydrosol with the crosslinking agent M(NH(3)4)(2+) (M2+ could be either Zn2+, Cu2+, Ni2+ or Co2+). It was supposed that in the soap-free acrylate hydrosol/ M(NH3)(4)(2+) mixed system, before heating M2+ in the form of M(NH3)(4)(2+) 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 NH3 ligand to join the coordination-crosslinking reaction with (P-COO-) forming network structure (P COO-)(n) M2+. IR spectrographic analysis, fluorescence analysis and the linear sweep voltammetry plarographic analysis identified the existence of (P-COO-)(n)M2+ 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 Zu(NH3)(4)(2+) and the optimum curing condition was heating at 80 degrees C for 30 min. The crosslinking reaction has been studied preliminary 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. 
Coordination-crosslinking; Hydrosol; Metal ion