含氟接枝共聚物为助稳定剂的苯乙烯细乳液聚合反应

The kinetics of the Styrene Miniemulsion Polymerization Co-stabilized by Graft Fluoropolymer

以含氟接枝共聚物(PSG)单独作为助稳定剂,十二烷基硫酸钠(SDS)为乳化剂,过硫酸钾(KPS)为引发剂引发苯乙烯(St)的细乳液聚合。考察了聚合温度、乳化剂用量、引发剂用量和PSG用量对细乳液聚合转化率的影响。结果表明,以PSG单独作为助稳定剂,细乳液聚合过程较稳定,起始单体液滴数目与成核粒子数目几乎相等。最终转化率随着乳化剂用量和反应温度的提高而增加,引发剂用量影响不明显。在相同的反应条件下,分别以相同用量(w.t.%=0.091%时,占单体和水的总质量)的PSG和十六醇为助稳定剂用于苯乙烯细乳液聚合,反应290min后,PSG体系的聚合转化率达到87.2%,而十六醇体系的聚合转化率只有78.2%。

The graft fluorocopolymer （PSG） was used as the sole co-stabilizer in styrene miniemulsion polymerization, in which SDS （Sodium dodecyl sulfate） was used as surfactant, potassium persulfate （KPS） as initiator. The effects of reaction temperature, mass of surfactant, mass of initiator and mass of PSG on the polymerization conversion were investigated. Results show that the polymerization process of the styrene miniemulsion polymerization was stable when PSG used as the sole co-stabilizer, and the initial number of monomer droplets and the number of latex particles were nearly equal. The final conversion increased with the reaction temperature and mass of SDS, but was not affected by mass of KPS. With the same reaction condition, when PSG and traditional co-stabilizer cetyl alcohol （CA） was used to co-stabilize the styrene miniemulsion polymerization respectively （mass weight 0. 091w. t%, based on the total mass weight of water and monomer）, the polymerization conversion was 87.2% at 290 min by PSG system, and was 78.2% by CA.