Effect of chemical surface treatment on the mechanical properties of reinforced plasticized poly(lactic acid) biodegradable composites
Biodegradable composites were prepared by melt-blending technique using 30 wt% kenaf bast fiber (KBF) to reinforce 70 wt% plasticized poly(lactic acid) (PLA). The KBF was treated with various percentages of sodium hydroxide (NaOH), whereas 5% triacetin was used as plasticizer. The effects of the K...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
SAGE Publications
2011
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/52070/ http://irep.iium.edu.my/52070/ http://irep.iium.edu.my/52070/ http://irep.iium.edu.my/52070/1/15.pdf http://irep.iium.edu.my/52070/7/52070-Effect%20of%20chemical%20surface%20treatment%20on%20the%20mechanical%20properties%20of%20reinforced%20plasticized%20poly-SCOPUS.pdf http://irep.iium.edu.my/52070/8/52070-Effect%20of%20chemical%20surface%20treatment%20on%20the%20mechanical%20properties%20of%20reinforced%20plasticized%20poly-WOS.pdf |
| Summary: | Biodegradable composites were prepared by melt-blending technique using 30 wt% kenaf bast fiber (KBF) to reinforce
70 wt% plasticized poly(lactic acid) (PLA). The KBF was treated with various percentages of sodium hydroxide (NaOH),
whereas 5% triacetin was used as plasticizer. The effects of the KBF surface treatments on the tensile, flexural, impact
strength, and DMA of the biocomposites were investigated. Tensile, flexural, and impact testing results reveal that 4% of
NaOH-treated KBF produced composites with optimum tensile strength (62 MPa), flexural strength (67 MPa), and the
impact strength (42 kJ/m2
). The removal of the lignin from the fiber during the surface treatment caused the increment in
the modulus result. This finding is also supported by the dynamic mechanical analysis. The storage modulus of plasticized
PLA/treated KBF is higher than the storage modulus of plasticized PLA/untreated KBF which is attributed to the enhancement
of the fiber–matrix adhesion. The loss modulus results showed that the Tg of the plasticized composites was shifting
to higher temperature, from 55°C for plasticized PLA/untreated KBF to 65°C for plasticized PLA/treated KBF. The increase
in Tg shows that the plasticized PLA has low chain mobility when reinforced with treated KBF, indicating better interaction. |
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