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Preparation and Characterization of Bioplastic-Based Green Renewable Composites from Tapioca with Acetyl Tributyl Citrate as a Plasticizer
- Source :
- Materials, Vol 7, Iss 8, Pp 5617-5632 (2014), Materials; Volume 7; Issue 8; Pages: 5617-5632, Materials
- Publication Year :
- 2014
- Publisher :
- MDPI AG, 2014.
-
Abstract
- Granular tapioca was thermally blended with poly(lactic acid) (PLA). All blends were prepared using a plasti-corder and characterized for tensile properties, thermal properties and morphology. Scanning electron micrographs showed that phase separation occurred, leading to poor tensile properties. Therefore, methylenediphenyl diisocyanate (MDI) was used as an interfacial compatibilizer to improve the mechanical properties of PLA/tapioca blends. The addition of MDI could improve the tensile strength of the blend with 60 wt% tapioca, from 19.8 to 42.6 MPa. In addition, because PLA lacked toughness, acetyl tributyl citrate (ATBC) was added as a plasticizer to improve the ductility of PLA. A significant decrease in the melting point and glass-transition temperature was observed on the basis of differential scanning calorimetry, which indicated that the PLA structure was not dense after ATBC was added. As such, the brittleness was improved, and the elongation at break was extended to several hundred percent. Therefore, mixing ATBC with PLA/tapioca/MDI blends did exhibit the effect of plasticization and biodegradation. The results also revealed that excessive plasticizer would cause the migration of ATBC and decrease the tensile properties.
- Subjects :
- Toughness
Materials science
Bioplastic
lcsh:Technology
Article
Differential scanning calorimetry
poly(lactic acid) (PLA)
Ultimate tensile strength
biodegradable
tapioca
methylenediphenyl diisocyanate (MDI)
acetyl tributyl citrate (ATBC)
General Materials Science
Composite material
Ductility
lcsh:Microscopy
lcsh:QC120-168.85
lcsh:QH201-278.5
lcsh:T
Plasticizer
technology, industry, and agriculture
Biodegradation
lcsh:TA1-2040
Melting point
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
lcsh:Engineering (General). Civil engineering (General)
lcsh:TK1-9971
Subjects
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 7
- Issue :
- 8
- Database :
- OpenAIRE
- Journal :
- Materials
- Accession number :
- edsair.doi.dedup.....f4c64b74280b168d449e9a56a98d3ff6