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Sains Malaysiana 44(7)(2015): 995–1001 Modification of Chitosan for Preparation of Poly(N-isopropylacrylamide/ O-nitrochitosan) Interpenetrating
Polymer Network (Pengubahsuaian
Kitosan untuk
Penyediaan Polimer Rangkaian Saling Menembus
Poli(N-isopropilakrilamida/O-nitrokitosan)) N.A. RAHMAN1,
S.A.
HANIFAH1,2*, A.M.N.
ZANI1
& A. AHMAD1 1School of Chemical
Sciences and Food Technology, Universiti
Kebangsaan Malaysia 43600 Bangi, Selangor
Darul Ehsan, Malaysia 2Polymer Research
Center, Faculty of Science and Technology, Universiti
Kebangsaan Malaysia 43600 Bangi, Selangor
Darul Ehsan, Malaysia Diserahkan: 27 Jun 2013/Diterima: 27 Mac 2015 ABSTRACT An interpenetrating polymer
network (IPN), N-isopropylacrylamide/O-nitrochitosan (NONK) was developed in the presence
of ammonium persulfate using solution polymerization technique.
O-nitrochitosan (ONK) was synthesized from chitosan,
before it was further reacted with N-isopropylacrylamide.
A new vibration of the C-N bond formed between the NH from
ONK
and the CH2 from NIPAAm
was detected at the peak 1154 and 1171 cm-1 using attenuated total reflection
Fourier-transform infrared (ATR-FTIR) spectroscopy. In the
polymerization, the primary amine became a secondary amine and the
peaks of the amide I (C=O peak) and amide II (N–H) were broadened.
The structure of ONK
was confirmed using nuclear magnetic resonance (NMR).
At 10°C, the result from swelling test was found that IPN poly(NONK82) had the highest swelling percentage,
1171%, compared to poly (NIPAAm)
at 467%. Micrograph from scanning electron microscopy (SEM)
indicated the pore size of IPN NONK increased with an increasing
ratio of ONK. Keywords: N-isopropylacrylamide(NIPAAm); nuclear magnetic
resonance(NMR); O-nitrochitosan
(ONK) ABSTRAK Polimer rangkaian saling
menembus (IPN) N-isopropilakrilamida/O-nitrokitosan (NONK) telah
dibangunkan dengan
kehadiran amonium persulfat dengan menggunakan teknik pempolimeran larutan. O-nitrokitosan disintesis
daripada kitosan
terlebih dahulu sebelum ditindak balaskan dengan N-isopropilakrilamida. Satu
getaran baru ikatan
C-N terbentuk di antara
NH
dari ONK dan CH2 dari NIPAAm
pada puncak
1154 dan 1171 cm-1 diperhatikan
dengan menggunakan
spektroskopi (FTIR-ATR). Kumpulan amina primer menjadi amina sekunder dan puncak amida
I (puncak C=O) dan
amida II (N–H) semakin melebar akibat pempolimeran. Struktur ONK ditentukan melalui nuklear magnetik resonans (NMR).
Pada suhu 10°C,
hasil ujian pembengkakan
mendapati IPN poli(NONK82)
mempunyai peratus
pembengkakan yang paling tinggi
iaitu 1171% berbanding poli (NIPAAm)
iaitu 467%. Mikrograf
mikroskopi elektron imbasan (SEM) menunjukkan
saiz liang
IPN
NONK meningkat dengan
peningkatan nisbah
ONK
dalam IPN. Kata kunci: N-isopropilakrilamida
(NIPAAm); nuklear magnetik resonans(NMR); O-nitrokitosan
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Carbohydrate Polymers 77(4): 785-790. *Pengarang untuk surat-menyurat; email: sharina@ukm.edu.my
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