高固体质量分数丙烯酰胺共聚物反相微乳胶的制备

考察了相关因素对丙烯酰胺(AM)/2-丙烯酰胺基-2-甲基丙磺酸(AMPS)反相微乳液聚合反应的影响。实验发现,所得丙烯酰胺共聚物P(AM-co-AMPS)的相对平均分子质量随单体质量分数的增加而增大,随反应温度的升高、乳化剂质量分数的增加而减小;随引发剂的质量分数、pH值的增大呈现出先增大后减小的变化趋势;在相同实验条件下,以混合单体中m(AM)∶m(AMPS)=5时得到的P(AM-co-AMPS)相对平均分子质量最大。在反应温度为35℃,引发剂质量分数为单体质量0.23%的条件下,通过反相微乳液聚合反应,制得了质量分数wP(AM-co-AMPS)]=31.0%透明、稳定的P(AM-co-AMPS)反相微乳胶。

Preparation of inverse microemulsion of acrylamide copolymer with higher solid mass fraction

The effects of relative factors on the inverse microemulsion polymerization of acrylamide(AM)/2-acrylamido-2-methyl propane sulfonic acid(AMPS) were investigated.The experiment shows that the relative molecular mass of P(AM-co-AMPS) increases with the increase of mass fraction of AM/AMPS,and decreases with the increase of reaction temperature and the mass fraction of emulsifier.Increasing the mass fraction of initiator and pH value can increase the relative molecular mass at the beginning of reaction,but then make it lower at following last reaction time.When m(AM) ∶m(AMPS)=5,the relative molecular mass of P(AM-co-AMPS) is higher at the same experimental condition.Under the condition that the reaction temperature was 35 ℃,and the mass(fraction) of initiator was 0.23% of monomers mass,the stable and transparent inverse letax of acrylamide copolymer P(AM-co-AMPS) with higher solid mass fraction wP(AM-co-AMPS)]=31.0% was obtained by inverse microemulsion polymerization.