Abstract: Suspended emulsion polymerization of vinyl chloride was carried out in a 5 L autoclave. The
influenceof agitation, polymerization conversion, dispersant and surfactant on the average
particle size (PS) and particle sizedistribution (PSD), particle morphology and porosity of
polyvinyl chloride (PVC) resin was investigated. It showedthat the agitator had great
influence on the smooth operation of polymerization, PS and PSD. The PS increasedand PSD
became narrow as polymerization conversion became high. The porosity decreased with the
increase ofconversion. A convenient choice of additives, both dispersants and non-ionic
surfactants, allows one to adjust PSand PSD. The PS decreased with the addition of
polyvinyl alcohol or hydroxypropyl methylcellulose dispersants,and increased with the
addition of Span surfactants. The addition of dispersants or surfactants also affected
themorphology and porosity of resin, and PVC resin with looser agglomeration and
homogeneous distribution of primaryparticles was prepared.

Key words: suspended emulsion polymerization, vinyl chloride, dispersant, particle size, particle size distribution, porosity

摘要： Suspended emulsion polymerization of vinyl chloride was carried out in a 5 L autoclave. The
influenceof agitation, polymerization conversion, dispersant and surfactant on the average
particle size (PS) and particle sizedistribution (PSD), particle morphology and porosity of
polyvinyl chloride (PVC) resin was investigated. It showedthat the agitator had great
influence on the smooth operation of polymerization, PS and PSD. The PS increasedand PSD
became narrow as polymerization conversion became high. The porosity decreased with the
increase ofconversion. A convenient choice of additives, both dispersants and non-ionic
surfactants, allows one to adjust PSand PSD. The PS decreased with the addition of
polyvinyl alcohol or hydroxypropyl methylcellulose dispersants,and increased with the
addition of Span surfactants. The addition of dispersants or surfactants also affected
themorphology and porosity of resin, and PVC resin with looser agglomeration and
homogeneous distribution of primaryparticles was prepared.

关键词: suspended emulsion polymerization;vinyl chloride;dispersant;particle size;particle size distribution;porosity