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Synthesis and mechanochemical properties of biobased ABCBA-type pentablock copolymers comprising poly-d-lactide (A), poly-l-lactide (B) and poly(1,2-propylene succinate) (C) |
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| Authors: | Yasumasa Nishiwaki Kazunari Masutani Yoshiharu Kimura Chan-Woo Lee |
| Affiliation: | 1. Department of Biobased Materials Science, Kyoto Institute of Technology, Kyoto, Japan Contribution: Data curation (lead), Writing - original draft (equal);2. Center for Fiber and Textile Science, Kyoto Institute of Technology, Kyoto, Japan;3. Center for Fiber and Textile Science, Kyoto Institute of Technology, Kyoto, Japan Contribution: Supervision (lead), Visualization (supporting), Writing - original draft (supporting), Writing - review & editing (supporting);4. Department of Innovative Industrial Technology, Hoseo University, Asan, South Korea |
| Abstract: | The ABCBA pentablock copolymers (p-d -l -PPS) comprising poly(d -lactide) (PDLA: A), poly(l -lactide) (PLLA: B) and poly(propylene succinate) (PPS: C) were successfully synthesized by two-step ring-opening polymerization (ROP) of d - and l -lactide using a dihydroxy-terminated PPS as a macro-initiator. The pentablock copolymers revealed the high stereocomplex (sc) crystallinity, thermal stability and elastomeric property in their solution-cast films. It was found that the Tg was found to be proportional to the PPS content, whereas the Tm was proportional to their average block length. The thermal resistivity of the copolymer films was found to be as high as 202°C owing to their sc formation. The copolymers also showed improved stereocomplexibility compared to the enantiomeric mixtures of triblock copolymers (PLLA-PPS-PLLA and PDLA-PPS-PDLA) having similar PLLA and PDLA chain lengths. These pentablock copolymers can afford thermoplastic elastomers or flexible plastic materials having a 100% bio-based content, showing high heat-resistive property. |
| Keywords: | ABCBA pentablock copolymers biobased polymer poly(1,2-propylene succinate) polylactide stereocomplex |