Dispersion Polymerization of Methyl Methacrylate in Supercritical Carbon Dioxide
Control of Molecular Weight Distribution by Adjusting Particle Surface Area
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Date
2007
Publication Type
Conference Paper
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yes
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Abstract
Summary: Experiments of methyl methacrylate dispersion polymerization are carried out in a reaction calorimeter using PDMS‐mMA as surfactant. Different stabilizer concentrations from 0 to 10 wt% with respect to monomer have been considered in order to control particle morphology. The analysis by scanning electron microscopy reveals a definite decrease of the total particle surface area at decreasing stabilizer concentration. At the same time, the analysis of the polymer microstructure by gel permeation chromatography shows a trend of the average molecular weight towards smaller values. In particular, a second mode at low molecular weights has been observed leading to bimodal molecular weight distributions. The experimental results are compared with simulation results obtained through a detailed kinetic model developed in previous studies. The key role of the radical exchange between continuous and dispersed phases is confirmed.
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published
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Journal / series
Volume
259 (1)
Pages / Article No.
218 - 225
Publisher
Wiley-VCH
Event
9th International Workshop on Polymer Reaction Engineering
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Subject
calorimetry; dispersion polymerisation; molecular weight distribution; polymerization modelling; supercritical carbon dioxide
Organisational unit
03451 - Morbidelli, Massimo (emeritus) / Morbidelli, Massimo (emeritus)
Notes
Published online 11 December 2007.