The random copolymers of different compositions PVM-5

PVM-10

PVM-30 and PVM-44 (where the number indicating the mass percentage of 1-VIm monomer) were synthesized by solution copolymerization of 1-VIm and MMA. The Cu2+-P(VIm/MMA)-shelled microcapsule was prepared by piercing-bath methode

which is a very simple process

just droping P(VIm/MMA)/THF solution into CuCl2 aqueous solution.The disintegration of shells is caused by dissolution

decomposion

depolymerization when they react with some ions or molecules

or based on permeability change of shell aroused by swelling.The four polymers with different 1-VIm/MMA ratios were studied through FTIR

EA

OM and SEM.The results showed the polymerization effect of PVM-30 was better than that of PVM-5

PVM-10 and PVM-44.The best PVM-30 microcapsules were prepared using solutions with concentration of 20 g/L

and the microcapsule particle size is about 1 mm

and shell thickness is 350 m.To make sence

the structure of PVM-30 was analysed by 1H-NMR

and the average molecular weight was about 16000 which was measured by GPC.FTIR and TG results demonstrate that the composition of microcapsules shell is PVM-Cu.The influence of NO3-

SO42- and CO32- on the shell of microcapsules was studied.The obtained results indicate that microcapsules were cracked by soaking in CO32- solutions

and a more stable blue ligand-ions solution was generated at last

indicating the chemical trigger of microcapsules.