Ab initio reversible addition-fragmentation chain transfer emulsion polymerization of styrene/butyl acrylate mediated by poly(acrylic acid)-block-polystyrene trithiocarbonate

作者：Zhou Jianhua^*; Wang Hailong; Zhang Lin; Ma Jianzhong

来源：Polymer International, 2014, 63(12): 2098-2104.

DOI：10.1002/pi.4755

• poly(acrylic acid)-block-polystyrene
• RAFT
• emulsion polymerization
• styrene
• butyl acrylate emulsifier-free emulsion

Ab initio reversible addition-fragmentation chain transfer (RAFT) emulsion polymerization of styrene/butyl acrylate was investigated with the trithiocarbonate macro-RAFT agent poly(acrylic acid)-block-polystyrene (PAA-b-PS) as a stabilizer and a RAFT agent. Influences of the amount of ammonium persulfate (APS), the amount of PAA-b-PS and the mass ratio of monomers on emulsion polymerization and film properties are discussed. The particle morphology exhibited spherical-like structure with particles of about 90nm in diameter and relatively narrow particle size distribution characterized using transmission electron microscopy and dynamic laser scattering. Fourier transform infrared and H-1 NMR spectra showed that the styrene/butyl acrylate emulsion was successfully synthesized. The monomer conversion increased initially with increasing amount of APS, from 0.4 up to 0.8wt%, and then decreased. The particle size increased and its distribution decreased gradually with increasing amount of APS. The monomer conversion increased from 76.83 to 94.21% as the amount of PAA-b-PS increased from 3 to 4wt%, and then decreased with further increase of PAA-b-PS. The particle size decreased and its distribution increased with increasing amount of PAA-b-PS. The water resistance and solvent resistance of the polymer films initially increased and then decreased with decreasing mass ratio of butyl acrylate to styrene.

• 出版日期2014-12
• 单位陕西科技大学