Phase equilibria in quaternary mixtures of styrene, acrylonitrile, poly(styrene-co-acrylonitrile) and polypropylene glycol: Modeling and experimental studies

Self Cite

A heterogeneous polymerization model, including an initial solution polymerization model and a later two‐phase polymerization model, is developed to describe graft free‐radical copolymerization of styrene and acrylonitrile in the presence of poly(propylene glycol). The diffusion‐controlled termination, initiation, propagation, and transfer in the dispersed phase are considered reasonably. The model describes the polymeriztion kinetics well. The main polymerization locus shifts from the continuous phase into the dispersed phase at monomer conversion of ≈0.03–0.05, leading to sharp increase in polymerization rate and molecular weight, decrease in graft efficiency and broadening of the MWD.

Section: Modelingmentioning

confidence: 99%

“…Partition coefficients of monomers (defined as the ratio of concentration in the dispersed phase to that in the continuous phase) are calculated by a phase equilibrium model 19…”

Section: Modelingmentioning

confidence: 99%

Section: Modelingmentioning

confidence: 99%

Section: Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Graft Copolymerization of Styrene and Acrylonitrile in the Presence of Poly(propylene glycol): Kinetics and Modeling

et al. 2012

Self Cite

Graft Copolymerization of Styrene and Acrylonitrile in the Presence of Poly(propylene glycol): Modeling and Simulation of Semi‐Batch and Continuous Processes

et al. 2012

Self Cite

An existing kinetic model for graft free‐radical copolymerization of styrene (St) and acrylonitrile (AN) in the presence of poly(propylene glycol) is extended to describe the semi‐batch process and to simulate the continuous process. A good predictive ability of the model for the semi‐batch process is demonstrated by comparing with experimental data, except for $\overline {M} _{{\rm w}} $ and polydispersity index at St/AN = 60/40 wt% in the feed. The continuous process is simulated under various reaction conditions. The solid content increases sharply with increasing monomer concentration. With decreasing St/AN weight ratio, the graft efficieny increases sharply and $\overline {M} _{{\rm w}} $ decreases.

Graft Copolymerization of Styrene and Acrylonitrile in the Presence of Poly(propylene glycol): Particle Growth

et al. 2012

Self Cite

The particle growth in the graft free‐radical copolymerization of styrene (St) and acrylonitrile (AN) in the presence of poly(propylene glycol) is investigated by experiments and modeling. The concentrations of chain transfer agent and macromer, and the St/AN ratio play important roles in particle size and its distribution. A particle size model is developed and an analytic expression for the particle size in terms of monomer mass concentration (Wmt0), initiator molar concentration ([I]0), and macromer mass concentration (WM0) is derived. The particle size is described experimentally as: $W_{{\rm mt}0}^{0.58} \;W_{{\rm M}0}^{- 0.65} \;[{\rm I}]_{0}^{- 0.06} $. Particle growth processes under various experimental conditions are well described by the model.