Biodegradable elastomers based on ABA triblocks : influence of end-block crystallinity on elastomeric character
ABA triblock copolymers, based on biodegradable monomers, namely ε-caprolactone (CL) and L-lactide (LLA), were synthesized and studied. The end-blocks were mostly poly(L-lactide) while the middle segments were a random copolymer of PCL and PLLA. Synthesis of these copolymers was performed by varying...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/97324 http://hdl.handle.net/10220/10549 |
| _version_ | 1826118224020766720 |
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| author | Kong, Jen Fong Lipik, Vitali T. Abadie, Marc J. M. Deen, Gulam Roshan Venkatraman, Subbu S. |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Kong, Jen Fong Lipik, Vitali T. Abadie, Marc J. M. Deen, Gulam Roshan Venkatraman, Subbu S. |
| author_sort | Kong, Jen Fong |
| collection | NTU |
| description | ABA triblock copolymers, based on biodegradable monomers, namely ε-caprolactone (CL) and L-lactide (LLA), were synthesized and studied. The end-blocks were mostly poly(L-lactide) while the middle segments were a random copolymer of PCL and PLLA. Synthesis of these copolymers was performed by varying the end-block segment length while retaining a fixed middle-block segment length and vice versa. Nuclear magnetic resonance studies confirmed the designed structure of the copolymers and their thermal properties were studied with differential scanning calorimetry. Mechanical and thermomechanical properties were determined with an Instron tester and by dynamic mechanical analysis, respectively. The elastomeric character of the copolymers was verified by cyclic test as well as by creep and recovery measurements. Changes made to the middle- and end-block segment lengths had a significant influence on the mechanical properties of the copolymers, especially their extendibility and recoverability. An increase in the crystallinity of the end-blocks in the copolymers caused a drop in their elastomeric character. In cyclic testing, under conditions of 50% and 150% strain, copolymers with low end-block crystallinity could recover more than 85% whereas copolymers with high crystallinity showed reduced recovery values as low as 60%. |
| first_indexed | 2024-10-01T04:40:11Z |
| format | Journal Article |
| id | ntu-10356/97324 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:40:11Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/973242020-06-01T10:01:36Z Biodegradable elastomers based on ABA triblocks : influence of end-block crystallinity on elastomeric character Kong, Jen Fong Lipik, Vitali T. Abadie, Marc J. M. Deen, Gulam Roshan Venkatraman, Subbu S. School of Materials Science & Engineering ABA triblock copolymers, based on biodegradable monomers, namely ε-caprolactone (CL) and L-lactide (LLA), were synthesized and studied. The end-blocks were mostly poly(L-lactide) while the middle segments were a random copolymer of PCL and PLLA. Synthesis of these copolymers was performed by varying the end-block segment length while retaining a fixed middle-block segment length and vice versa. Nuclear magnetic resonance studies confirmed the designed structure of the copolymers and their thermal properties were studied with differential scanning calorimetry. Mechanical and thermomechanical properties were determined with an Instron tester and by dynamic mechanical analysis, respectively. The elastomeric character of the copolymers was verified by cyclic test as well as by creep and recovery measurements. Changes made to the middle- and end-block segment lengths had a significant influence on the mechanical properties of the copolymers, especially their extendibility and recoverability. An increase in the crystallinity of the end-blocks in the copolymers caused a drop in their elastomeric character. In cyclic testing, under conditions of 50% and 150% strain, copolymers with low end-block crystallinity could recover more than 85% whereas copolymers with high crystallinity showed reduced recovery values as low as 60%. 2013-06-24T08:00:52Z 2019-12-06T19:41:29Z 2013-06-24T08:00:52Z 2019-12-06T19:41:29Z 2011 2011 Journal Article Kong, J. F., Lipik, V., Abadie, M. J. M., Deen, G. R., & Venkatraman, S. S. (2012). Biodegradable elastomers based on ABA triblocks: influence of end-block crystallinity on elastomeric character. Polymer International, 61(1), 43-50. 0959-8103 https://hdl.handle.net/10356/97324 http://hdl.handle.net/10220/10549 10.1002/pi.3130 en Polymer international © 2011 Society of Chemical Industry. |
| spellingShingle | Kong, Jen Fong Lipik, Vitali T. Abadie, Marc J. M. Deen, Gulam Roshan Venkatraman, Subbu S. Biodegradable elastomers based on ABA triblocks : influence of end-block crystallinity on elastomeric character |
| title | Biodegradable elastomers based on ABA triblocks : influence of end-block crystallinity on elastomeric character |
| title_full | Biodegradable elastomers based on ABA triblocks : influence of end-block crystallinity on elastomeric character |
| title_fullStr | Biodegradable elastomers based on ABA triblocks : influence of end-block crystallinity on elastomeric character |
| title_full_unstemmed | Biodegradable elastomers based on ABA triblocks : influence of end-block crystallinity on elastomeric character |
| title_short | Biodegradable elastomers based on ABA triblocks : influence of end-block crystallinity on elastomeric character |
| title_sort | biodegradable elastomers based on aba triblocks influence of end block crystallinity on elastomeric character |
| url | https://hdl.handle.net/10356/97324 http://hdl.handle.net/10220/10549 |
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