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Toughening semicrystalline poly(lactic acid) by morphology alteration |
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| Authors: | Sahas Rathi E Bryan Coughlin Shaw Ling Hsu Charles S Golub |
| Affiliation: | a Polymer Science and Engineering Department and Materials Research Science and Engineering Center, University of Massachusetts, Amherst, MA 01003, USA b Key Laboratory of Advanced Materials Technology, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China c Saint Gobain Fluid Systems, Research & Development Center, 9 Goddard Road, Northborough, MA 01532, USA |
| Abstract: | The incorporation of the triblock copolymer (PDLA-PEG-PDLA) into Poly(l-Lactic Acid) (PLLA) has produced a semicrystalline polymer of substantial modulus and strength. These improvements in mechanical properties could potentially increase the utility of this biomass-based polymer. The blended samples have a continuous amorphous phase with crystalline regions being the discontinuous portion. Micro-Raman spectroscopy revealed that a stereocomplex involving PDLA and PLLA chains exists in the crystalline region. It can be concluded that the poly(ethylene glycol), the flexible midblock component, is necessarily dispersed in these crystalline regions. Both morphological features can contribute to the improvement in mechanical properties. Therefore, the successful toughening of PLA may be achieved due to several mechanisms working synergistically. |
| Keywords: | PLA Rubbery Morphology |
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