Sains Malaysiana 43(2)(2014): 241–245
Dynamic
Mechanical and Dielectric Properties of Modified Surface Chitosan/
Natural
Rubber Latex
(Sifat Mekanik Dinamik dan Dielektrik Permukaan Chitosan yang
Diubahsuai / Lateks Getah Asli)
WIRACH TAWEEPREDA*
Department of Materials Science and Technology, Faculty
of Science, Prince of Songkla University
Hat-Yai, Songkhla 90110, Thailand
Received: 5 February 2013/Accepted: 30 July 2013
ABSTRACT
Biodegradable polymeric films, obtained from chitosan/natural rubber
latex (CS/NRL) blends with different compositions, have been
prepared by wetting process. The blends were characterized by dynamic
mechanical thermal analysis (DMTA) and found that the CS/NRL blends are thermodynamically incompatible. This is evident from
the presence of two glass transitions, corresponding to CS and NRL phases in the blend. The mechanical properties of the CS/NRL blends were improved with increasing the amount of chitosan and
after surface treatment with sulphuric acid due to the sulfonate ionic
interaction. The dielectric properties was determined
using Precision LCR meter in the frequency range 75
kHz up to 30 MHz. After CS/NRL surface treatment with
sulphuric acid at high content of chitosan showed the highest dielectric
constant. The surface properties of the CS/NRL blend films before and
after surface treatment were confirmed by atomic force microscopy (AFM),
respectively.
Keywords: Biopolymer; chitosan; dielectric properties; natural
rubber; surface modification
ABSTRAK
Penggunaan filem terbiourai yang diperoleh daripada campuran (CS/NRL)
lateks getah asli/ kitosan dengan komposisi yang berbeza, telah disediakan
secara proses basah. Campuran dicirikan menggunakan teknik
analisis haba mekanik dinamik (DMTA) dan mendapati bahawa
campuran CS/NRL semula jadi tidak serasi. Ini adalah jelas daripada kewujudan dua peralihan kaca, yang sesuai
dengan fasa CS dan NRL dalam adunan. Sifat mekanik campuran CS/NRL telah dipertingkatkan
dengan meningkatkan jumlah kitosan dan selepas rawatan permukaan menggunakan
asid sulfurik berlaku interaksi ionik sulfonat. Sifat dielektrik
ditentukan menggunakan LCR ketepatan meter dalam kekerapan
julat 75 kHz sehingga 30 MHz. Selepas rawatan permukaan CS/NRL dengan
asid sulfurik pada kandungan yang tinggi daripada kitosan menunjukkan
berlakunya pembentukan malar dielektrik yang tertinggi. Sifat
permukaan CS/NRL menggabungkan filem sebelum dan selepas rawatan
permukaan telah disahkan masing-masing oleh Microskop berkuat-kuasa atom (AFM).
Kata kunci: Getah asli; kitosan; permukaan
pengubahsuaian; polimer-Bio ditawarkan; sifat dielektrik
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*Corresponding author; email: wirach.t@psu.ac.th
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