Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Asian Journal of Scientific Research
Year: 2019  |  Volume: 12  |  Issue: 4  |  Page No.: 508 - 515

Influence of Chain Extension on Thermal and Mechanical Properties of Injection-molded Poly(L-lactide)-b-poly(ethylene Glycol)-b-poly(L-lactide) Bioplastic

Yodthong Baimark, Supasin Pasee, Wuttipong Rungseesantivanon and Natcha Prakymoramas    

Abstract: 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.

Cited References   |    Fulltext    |   Related Articles   |   Back
   
 
 
 
  Related Articles

 
 
 
 
 
 
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility