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Hybrid and other nanoparticles for vinyl chloride polymerisation nucleation
|Maria Obloj-Muzaj 1, Maria Zielecka 1, Agnieszka Abramowicz , Anna Szulc 1, Wojciech Domanowski 1|
1. Industrial Chemistry Research Institute (ICRI), Rydygiera 8, Warszawa 01-793, Poland
Suspension polymerisation of vinyl chloride has been carried out on various types of nanoparticles chosen from clays, silica (pure or functionalized), silicone polymer or hybrid core/shell ones. Nanofillers used for VC polymerisation nucleation significantly influence the structure and shape of PVC grain: from typical "cauliflower" in case of control sample and in the presence of silica to "cakes" in case of functionalized silica, "sea-shells" with silicone polymer use or "balls" - unusual for suspension PVC - in the presence of core/shell particles. The last ones look just as emulsion PVC although were prepared in suspension polymerisation process.
It has been found using SEM and TEM methods that distribution of nanofiller in polymer was rather uniform. Montmorillonite looks to be intercalated and partially exfoliated in PVC grain. Silica nanospheres look to be able to change the shape under VC polymerisation conditions and to form sharp-edged structures. Some ordered regions showing mesoporosity were also found suggesting the formation of more ordered structures. These regions are visible especially in the samples nucleated with silica.
There are strong interactions between functionalized or hybrid nanofillers with suspension stabilisers and nanofillers are often captured in stabilisers' net. The presence of nanofillers in PVC grain as well as the change of PVC grain shape caused by them significantly influences the final properties of PVC and its processability.
Presentation: oral at E-MRS Fall Meeting 2005, Symposium E, by Maria Obloj-Muzaj
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-20 08:59 Revised: 2009-06-07 00:44