Mueller, Philipp A.Storti, GiuseppeMorbidelli, MassimoMantelis, Charalampos A.Meyer, Thierry2009-02-092009-02-092009-02-09200710.1002/masy.200751326https://infoscience.epfl.ch/handle/20.500.14299/34844WOS:000252693100028Expts. 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.Polymer morphologyPolymerization catalystsSupercritical fluids (dispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area)Polymerization (dispersiondispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area)Molecular weight distributionParticle size (of PMMAdispersion polymn. of Me methacrylate in supercrit. carbon dioxide with emphasis on control of mol. wt. distribution by adjusting particle surface area)Surfactants (polysiloxaneacting as PMMA particle stabilizerdispersion 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 stabilizerdispersion 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 dioxidemol wt PMMA prepd dispersion polymn supercrit carbon dioxidetext::journal::journal article::research article