Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 56, Issue 1, Pages 52-62Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.6b03151
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Funding
- National Natural Science Foundation of China [51403199]
- National High Technology Research and Development Program of China (863 Program Project) [2015AA034004]
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Poly(L-lactide)/poly(butylene succinate) (PLLA/PBS) blends were prepared by melt mixing with a PLLA-based compatibilizer (PBS-PLLA) and a chain extender triarm block copolymer (PLLA-block-poly(glycidyl methacrylates))(3) (PLLA-b-PGMA)(3). The tensile testing showed significant improvement in mechanical properties and remarkably maintained high strength. Rheological investigation of PLLA/PBS/PBS-PLLA/(PLLA-b-PGMA)(3) indicated that the viscosity and storage modulus was improved greatly compared with neat PLLA. Elongational viscosity measurements exhibited strong strain-hardening behavior. The increase of the torque indicated the occurrence of chain branching and chain extension reaction. The imperfect crystallization of PLLA/PBS/PBS-PLLA/(PLLA-b-PGMA)(3) blends was demonstrated by the lowered melt point of PLLA. SEM showed that the PBS-PLLA and (PLLA-b-PGMA)(3) significantly improved the compatibility of the PLLA/PBS blends. It was indicated that the synergistic effects of PBS-PLLA and (PLLA-b-PGMA)(3) in PLLA/PBS blends played a key role in properties enhancement. With copolymerization and in situ reactive compatibilization, PLLA/PBS/PBS-PLLA/(PLLA-b-PGMA)(3) blends not only improved the toughness but also improved the melt strength.
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