Dispersion polymerization of methyl methacrylate in supercritical carbon dioxide: control of molecular weight distribution by adjusting particle surface area
Mueller, Philipp A.; Storti, Giuseppe; Morbidelli, Massimo; Mantelis, Charalampos A.; Meyer, Thierry
2007

Abstract

Expts. of Me methacrylate dispersion polymn. are carried out in a reaction calorimeter using PDMS-mMA (methacrylate-terminated polydimethylsiloxane) as surfactant. Different stabilizer concns. from 0 to 10 wt% with respect to monomer have been considered in order to control particle morphol. The anal. by SEM reveals a definite decrease of the total particle surface area at decreasing stabilizer concn. At the same time, the anal. of the polymer microstructure by gel permeation chromatog. shows a trend of the av. mol. wt. towards smaller values. In particular, a second mode at low mol. wts. has been obsd. leading to bimodal mol. wt. distributions. The exptl. 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.

Details

Title Dispersion polymerization of methyl methacrylate in supercritical carbon dioxide: control of molecular weight distribution by adjusting particle surface area
Author(s) Mueller, Philipp A. ; Storti, Giuseppe ; Morbidelli, Massimo ; Mantelis, Charalampos A. ; Meyer, Thierry
Published in Macromolecular Symposia
Volume 259
Issue Polymer Reaction Engineering--International Workshop, 2007
Pages 218-225
Date 2007
Keywords
Polymer morphology; Polymerization catalysts; Supercritical fluids (dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area); Polymerization (dispersion; dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area); Molecular weight distribution; Particle size (of PMMA; dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area); Surfactants (polysiloxane; acting as PMMA particle stabilizer; dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area); Polysiloxanes Role: TEM (Technical or engineered material use); USES (Uses) (surfactant acting as PMMA particle stabilizer; dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area); PMMA prepn dispersion polymn supercrit carbon dioxide; mol wt PMMA prepd dispersion polymn supercrit carbon dioxide
Note CAN 148:308707, 35-4, Chemistry of Synthetic High Polymers, DuPont Engineering Research & Technology,Experimental Station,Wilmington,DE,USA., Journal, 1022-1360, written in English., 78-67-1 (AIBN) Role: CAT (Catalyst use), USES (Uses) (dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area); 124-38-9 (Carbon dioxide) Role: NUU (Other use, unclassified), USES (Uses) (dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area); 9011-14-7P (PMMA) Role: PRP (Properties), SPN (Synthetic preparation), PREP (Preparation) (dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area); 1066-42-8D (Dimethylsilanediol) Role: TEM (Technical or engineered material use), USES (Uses) (surfactant acting as PMMA particle stabilizer; dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area)
DOI https://doi.org/10.1002/masy.200751326
Other identifier(s) View record in Web of Science
Laboratories SCC
GSCP
Record Appears in Scientific production and competences > SB - School of Basic Sciences > ISIC - Institute of Chemical Sciences and Engineering > GSCP - Group of Chemical and Physical Safety
Scientific production and competences > Non-academic units > SCC - Safety Competence Center
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2009-02-09

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