Effects of acrylonitrile-butadiene latex powder on the impact and thermal properties of poly(lactic acid)
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Date
2017-07
Authors
Nurul Farihah Bt Kamal
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Abstract
Polylactic acid (PLA)/acrylonitrile butadiene rubber (NBR) latex blends were
prepared using internal mixer followed by compression molding. The blending ratio of
PLA/NBR are 95:5, 90:10, 85:15, 80:20, 75:25 and 70:30. The objective of this research
is to study the effect of NBR latex powder on the impact and thermal properties of PLA.
The NBR latex powder was prepared by NBR latex compounding followed by drying and
grinding process. The mechanical and morphological properties of PLA/NBR blends
were characterized by Charpy impact test and Scanning Electron Microscopy (SEM). The
thermal properties of PLA/NBR blends were determined using Thermogravimetric
Analyzer (TGA) and Differential Scanning Calorimeter (DSC). Fourier Transform
Infrared (FTIR) Spectroscopy was used to determine the intermolecular interactions of
the PLA/NBR blends. It was found that the impact strength of PLA was increased by
addition of NBR latex powder. This is due to the elastomeric behaviour of NBR latex
powder itself. The glass transition temperature of PLA was reduced by the incorporation
of NBR latex powder, which indicates the increased flexibility of PLA/NBR blends.
Nevertheless, from the TGA measurement, the results showed that the addition of NBR
latex powder reduced the thermal stability of PLA.