The use of aluminum trialkoxide for synthesis of poly (ε-caprolactone) and poly (δ-valerolactone): A comparative study
© 2018, Prince of Songkla University. All rights reserved. Four aluminum(III) trialkoxides, namely Al(III) ethoxide (1), Al(III) isopropoxide (2), Al(III) tert-butoxide (3), and Al(III) sec.-butoxide (4), were employed as initiators for the bulk ring-opening polymerizations of δ-valerolactone (VL) a...
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| Main Authors: | , , , |
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| Format: | Journal |
| Published: |
2018
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| Subjects: | |
| Online Access: | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85057192713&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/62989 |
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| Institution: | Chiang Mai University |
| Summary: | © 2018, Prince of Songkla University. All rights reserved. Four aluminum(III) trialkoxides, namely Al(III) ethoxide (1), Al(III) isopropoxide (2), Al(III) tert-butoxide (3), and Al(III) sec.-butoxide (4), were employed as initiators for the bulk ring-opening polymerizations of δ-valerolactone (VL) and ε-caprolactone (CL). Chemical structure and properties of the prepared polymers were assessed by various techniques, such as FTIR,1H-NMR, GPC, TGA and DSC. The effects of initiator concentrations and solubility as well as temperature were investigated for optimum polymerization conditions. It was found that the optimal conditions were 120 °C for 72 hours with 0.2 %mol of initiator. However, 1 and 3 only partially dissolved in the CL monomer and gave no polymerization at low initiator concentration. In contrast, 4 was completely soluble in CL monomer and gave the highest yield (92%) and molecular weight (Mn = 2.83 × 104 g/mol). Both polymers exhibited similar melting characteristics, with PCL being thermally more stable than PVL. |
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