The effects of solvent and initiator on anionic ring opening polymerization of ϵ‐caprolactone: synthesis and characterization |
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Authors: | Seyed Amin Mirmohammadi Mohammad Imani Hiroshi Uyama Mohammad Atai Mohammad Bagher Teimouri Naeimeh Bahri‐Lale |
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Affiliation: | 1. Department of Applied Chemistry, Graduate School of Engineering, , Suita, Osaka, 565‐0871 Japan;2. Department of Polymer Science, Iran Polymer and Petrochemical Institute (IPPI), , Tehran, Iran;3. Faculty of Chemistry, Kharazmi University, , Tehran, Iran;4. Department of Polymerization Engineering, Iran Polymer and Petrochemical Institute (IPPI), , Tehran, Iran |
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Abstract: | Anionic ring opening polymerization of ?‐caprolactone was studied by using different amounts of two potassium activated initiators containing ethylene glycol (EG) and polyhedral oligomeric silsesquioxane (POSS) diol, in tetrahydrofuran and toluene as solvents. The synthesized hydroxyl terminated macromers and linear poly(?‐caprolactone) (PCL) were characterized by proton and carbon nuclear magnetic resonance and gel permeation chromatography (GPC) techniques. Results showed an increase in molecular weight as the monomer/initiator molar ratio increased from 100 to 151 and 202, while the molecular weight distribution (MWD) showed a minimum by monomer concentration increase. Moreover, POSS‐diol‐initiated PCLs showed a higher MWD than the polymers initiated with the EG initiator. This was attributed to the formation of a vesicular structure of POSS diols which was confirmed by optical microscopy. By deconvolution of GPC peaks, the best conditions to synthesize PCL with the narrowest MWD were selected. Finally, the effects of some other parameters were studied in more detail. |
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Keywords: | anionic ring opening polymerization POSS diol ethylene glycol vesicle deconvolution molecular weight distribution |
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