Study on the molecular weight at equilibrium for cationic emulsion polymerization of cyclosiloxane

The molecular weight at equilibrium of the cationic emulsion polymerization of cyclosiloxane was studied using octamethylcyclotetrasiloxane(D4) as monomer,benzyldimethyldodecylammonium bromize(DBDA) as cationic emulsifying agent,alkylphenol polyoxyethylene ether(OP-10) as non-ionic emulsifying agent and KOH as catalyst,3-(2-aminoethyl)-aminopropylmethyldimethoxyl silane(602)as polar monomer,Except temperature and the content of by-product had effect on reaction equilibrium,the absorption density of latex particles inter-face catalyst,benzyldimethyldodecylammonium hydroxide(BDAH),was also the important factor affected the mo-lecular weight at equilibrium.The results showed that the molecular weight at equilibrium increased with DBDA concentration,KOH concentration and stirring intensity increasing,and decreased with temperature,non-ionic emulsifying agent and polar monomer dosage increasing,and the effect of monomer content on the molecular weight at equilibrium could be ignored.