Study the synthesis parameters and effect of addition of acid hydrolyzed sago starch on mechanical properties of nr and xnbr latex films
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Date
2018-06
Authors
Yap, Soon You
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Abstract
The objective of this research was to develop a small particle size sago starch
with the motivation to improve mechanical properties and biodegradability of latex films
upon disposal. The research’s stage 1 investigated the optimum synthesis parameter
of the acid hydrolyzed sago starch (AHSS) powder. The native sago starch (NSS) were
hydrolyzed with different hydrolysis condition at different temperature, acidity and
duration. The results showed that the optimum synthesis parameters of preparation
acid hydrolysis sago starch fillers (313.10 nm) was at 2.18 M sulphuric acid under non
heated condition (27°C) for 7 days. Stage 2 of work, investigated the effect of addition
of AHSS fillers on mechanical properties (tensile properties and tear strength), physical
properties (crosslink density measurement), morphological (optical and scanning
electron microscopes (SEM)) and biodegradability of NR latex films and XNBR latex
films (mass loss analysis). It was found that the AHSS has improved mechanical
properties and swelling resistance of latex films as compared to NSS filled NR latex
films and NSS filled XNBR latex films. This was contributes by improvement in
compatibility of sago starch particles with rubber matrix which attributed from the
relative smaller particle size, presence of sulphate ester group and low crystallinity of
AHSS. The biodegradation assessment by mass loss analysis indicates AHSS filled
NR latex and XNBR filled latex films has higher degree of biodegradation rate.
Morphological analyses with optical microscope shows the discoloration of the films
and voids resulted from an increased of degradation sites for microorganisms during
the biodegradation process. Overall, AHSS has increased the mechanical properties, physical properties and biodegradability of both type of latex films (NR and XNBR)
compared to NSS.