Perfluoromethacrylate-styrene statistical copolymers synthesized in CO2-expanded monomers |
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Authors: | Ugur Cengiz H. Yildirim Erbil |
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Affiliation: | 1. Department of Chemical Engineering, Gebze Institute of Technology, Cayirova, Gebze, 41400, Kocaeli, Turkey 2. Department of Chemical Engineering, Faculty of Engineering, Canakkale Onsekiz Mart University, Canakkale, Turkey
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Abstract: | Statistical copolymers of perfluoroalkyl ethyl methacrylate (Zonyl-TM) and styrene (S) were synthesized in CO2-expanded monomer medium at a low initial pressure of 25 MPa. Different Zonyl-TM/S feed ratios were used during copolymerizations, and it was determined that the increase in the Zonyl-TM content and decrease of the CO2 amount in the comonomer feed resulted in a decrease of the molecular weights of copolymers due to earlier precipitation of copolymers giving shorter chains. The cloudy CO2-expanded liquid monomer phase was found to be the main loci of copolymerization. In addition, the increase in the Zonyl-TM feed ratio resulted in an increase in the critical degree of the polymerization time (J crit) as the time when the copolymer chains start to precipitate. The higher the Zonyl-TM content used in the feed, the higher the J crit time and the lower the weight-average molecular weight (M w) of the copolymer obtained. Thermal analysis results of the copolymer indicated that the copolymers are stable up to 387–403 °C. |
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