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The use of aluminum trialkoxide for synthesis of poly (?-caprolactone)and poly (?-valerolactone): A comparative study |
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| รหัสดีโอไอ | |
| Creator | 1. Jitrayut Jitonnom 2. Robert Molloy 3. Winita Punyodom 4. Wijitra Meelua |
| Title | The use of aluminum trialkoxide for synthesis of poly (?-caprolactone)and poly (?-valerolactone): A comparative study |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2018 |
| Journal Title | Songklanakarin Journal of Science and Technology |
| Journal Vol. | 40 |
| Journal No. | 4 |
| Page no. | 854 |
| Keyword | bulk ring-opening polymerization, lactone, aluminum trialkoxide, biodegradable polymer, characterization |
| URL Website | http://rdo.psu.ac.th/sjstweb/index.php |
| ISSN | 0125-3395 |
| Abstract | Four aluminum(III) trialkoxides, namely Al(III) ethoxide (1), Al(III) isopropoxide (2), Al(III) tert-butoxide (3), andAl(III) sec.-butoxide (4), were employed as initiators for the bulk ring-opening polymerizations of ?-valerolactone (VL) and ?caprolactone(CL). Chemical structure and properties of the prepared polymers were assessed by various techniques, such as1FTIR, H-NMR, GPC, TGA and DSC. The effects of initiator concentrations and solubility as well as temperature wereinvestigated for optimum polymerization conditions. It was found that the optimal conditions were 120 ?C for 72?hours with0.2 %mol of initiator. However, 1 and 3 only partially dissolved in the CL monomer and gave no polymerization at low initiatorconcentration. In contrast, 4 was completely soluble in CL monomer and gave the highest yield (92%) and molecular weight( M n = 2.83 x 104 g/mol). Both polymers exhibited similar melting characteristics, with PCL being thermally more stable thanPVL. |
