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Articles by Supasin Pasee
Total Records ( 1 ) for Supasin Pasee
  Yodthong Baimark , Supasin Pasee , Wuttipong Rungseesantivanon and Natcha Prakymoramas
  Background and Objective: Poly (L-lactide) (PLLA) is a biodegradable bioplastic that has attracted much attention for use in biomedical and packaging applications. In this work, effect of chain extender on thermal and mechanical properties of injection-molded PLLA-b-poly (ethylene glycol)-b-PLLA triblock copolymer (PLLA-PEG-PLLA) and their comparison with the injection-molded PLLA were investigated. Materials and Methods: A flexible PLLA-PEG-PLLA was adjusted by changing its Melt Flow Index (MFI) by chain-extension reaction before injection molding. Differential scanning calorimeter was used to investigate the thermal properties. The mechanical properties of injection-molded PLLA and PLLA-PEG-PLLA were determined by universal testing machine for tensile and flexural properties, impact tester and hardness testers. One-way analysis of variance and Duncan’s multiple test (p<0.05) were used to assess data. Results: The addition of chain extender decreased the MFI of PLLA-PEG-PLLA. The chain-extended PLLA-PEG-PLLA exhibited faster crystallization and more hydrophilicity than the PLLA. Hydrophilicity of PLLA-PEG-PLLA increased with the chain-extender content. From tensile curves, the chain-extended PLLA-PEG-PLLA had a yield effect indicating they were flexible. Strain at break and impact strength of chain-extended PLLA-PEG-PLLA were higher than the PLLA while their flexural stress and hardness were lower. The crystallization behaviors and mechanical properties of PLLA-PEG-PLLA did not change with the chain-extender content. Conclusion: The injection-molded bioplastics with high flexibility and toughness could be fabricated from chain-extended PLLA-PEG-PLLA.
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