This research studied the initiator efficiency for producing polymeric particles of poly(styrene-co-methyl methacrylate) copolymers by a Shirasu porous glass membrane (SPG) emulsification technique followed by suspens...This research studied the initiator efficiency for producing polymeric particles of poly(styrene-co-methyl methacrylate) copolymers by a Shirasu porous glass membrane (SPG) emulsification technique followed by suspension copolymerization. BPO, ADVN, and AIBN were used as initiators and we found that BPO is the most suitable initiator. Copolymers for various feed ratios of styrene/methyl methacrylate were thus synthesized by benzoyl peroxide, and their copolymer particle size, molecular weight distribution and pat-ride size distribution were characterized. Then n-BMA or 2-EHMA was added as the third monomer to decrease the terpolymer glass transition temperature. This article describes the preparation technique, recipes and polymerization conditions for producing both copolymer and terpolymer particles, particle size changes, the corresponding particle morphologies and glass transition temperatures.展开更多
Stable poly（styrene-co-sodium styrene sulfonate） （P（St-NaSS） nanoparticles with broader size distribution were synthesized by thermal emulsion polymerization without any conventional initiators and emulsifiers. T...Stable poly（styrene-co-sodium styrene sulfonate） （P（St-NaSS） nanoparticles with broader size distribution were synthesized by thermal emulsion polymerization without any conventional initiators and emulsifiers. The obtained polymer nanoparticles have higher potential, and the particle sizes have broad distribution. The stability of polymer particles originated from the addition of small amounts of ionic comonomer, NaSS, which can act as an emulsifier in somewhat. The monomer conversion could reach up to about 28 wt% in 48 h, and did not increase by further polymerization when higher polymerization temperature （120℃） was employed. This polymerization system may be give some further understand for mechanism of emulsion polymerization.展开更多
文摘This research studied the initiator efficiency for producing polymeric particles of poly(styrene-co-methyl methacrylate) copolymers by a Shirasu porous glass membrane (SPG) emulsification technique followed by suspension copolymerization. BPO, ADVN, and AIBN were used as initiators and we found that BPO is the most suitable initiator. Copolymers for various feed ratios of styrene/methyl methacrylate were thus synthesized by benzoyl peroxide, and their copolymer particle size, molecular weight distribution and pat-ride size distribution were characterized. Then n-BMA or 2-EHMA was added as the third monomer to decrease the terpolymer glass transition temperature. This article describes the preparation technique, recipes and polymerization conditions for producing both copolymer and terpolymer particles, particle size changes, the corresponding particle morphologies and glass transition temperatures.
文摘Stable poly（styrene-co-sodium styrene sulfonate） （P（St-NaSS） nanoparticles with broader size distribution were synthesized by thermal emulsion polymerization without any conventional initiators and emulsifiers. The obtained polymer nanoparticles have higher potential, and the particle sizes have broad distribution. The stability of polymer particles originated from the addition of small amounts of ionic comonomer, NaSS, which can act as an emulsifier in somewhat. The monomer conversion could reach up to about 28 wt% in 48 h, and did not increase by further polymerization when higher polymerization temperature （120℃） was employed. This polymerization system may be give some further understand for mechanism of emulsion polymerization.
