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http://dx.doi.org/10.17576/jsm-2019-4810-23
Synthesis and Characterization of Star-Shaped
(PCL-B-PEG) as Potential Electrospun Microfibres
(Sintesis dan Pencirian Berbentuk
Bintang (PCL-B-PEG) Berpotensi sebagai Elektrospun Mikrogentian) WAFIUDDIN ISMAIL1,
RUSLI
DAIK2,
SHAFIDA
ABD
HAMID1
& WAN KHARTINI WAN
ABDUL
KHODIR*1 1Department of Chemistry, Kulliyyah of Science, International Islamic University Malaysia,
Kuantan Campus, Bandar Indera Mahkota, 25200 Kuantan, Pahang Darul
Makmur, Malaysia 2School of Chemical Science and Food
Technology, Faculty of Science and Technology, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi,
Selangor Darul Ehsan, Malaysia Received:
16 May 2019/Accepted: 30 August 2019 ABSTRACT Star-shaped
polymers have vast potential in application due to their architecture.
In this study, a 6-arm star-shaped of poly(ԑ-caprolactone)-b-poly(ethylene glycol), (6PCG)
was synthesized via ring opening polymerization, (ROP)
of ԑ-caprolactone and Steiglich
esterification (coupling reaction) to attach the PEG arm
to the star-shaped polymer with discrete core of dipentaerythritol.
The polymer chemical structure was characterized by FT-IR.
The molecular weight (Mn) determined from
1H NMR
spectra showed that the star polymer has approximately
the same molecular weight as the theoretical value. The polydispersity
index indices (PDI)
(>1.5) from GPC were narrow suggesting controlled
polymerization reaction. Thermal stability of the star-shaped 6PCG
were examined using thermogravimetric
analysis, (TGA)
and differential scanning calorimetry, (DSC) and showed slight increase
compared to homopolymer star PCL due
to the changes of end-group functionalities. Six-arm star-shaped
PCL-b-PEG
was dissolved in chloroform/methanol solvents and
the resulting solution was used for electrospinning process. The
morphology of nanofibres showed fine fibres without beads and thus
a possible potential for several applications. Keywords:
Electrospinning; polycaprolactone; star
polymer ABSTRAK Polimer berbentuk
bintang memiliki
potensi yang besar dalam pelbagai aplikasi kerana reka bentuknya. Dalam kajian ini,
polimer berbentuk
bintang dengan 6 cabang poli(ԑ-kaprolakton)-b-poli(etilena glikol),
(6PCG) disintesis melalui pempolimeran pembukaan gelang, (ROP)
ԑ-kaprolakton dan
pengesteran Steiglich (tindak balas gabungan)
untuk menggabungkan
PEG
kepada polimer berbentuk bintang dengan teras diskret
dipenteritritol. Struktur
kimia polimer dicirikan
oleh FT-IR. Berat
molekul (Mn)
yang ditentukan daripada
spektrum 1H NMR menunjukkan
bahawa polimer
bintang ini mempunyai
berat molekul
yang hampir sama sebagai
nilai teori.
Indeks kepolitaburan (PDI)
(>1.5) yang diperoleh daripada
analisis GPC mencadangkan
tindak balas
pempolimeran adalah tindak balas terkawal.
Kestabilan terma
6PCG
polimer berbentuk bintang ini telah
dianalisis menggunakan
analisis termogravimetrik, (TGA)
dan kalorimetri
imbasan perbezaan (DSC)
dengan ia menunjukkan peningkatan kestabilan terma berbanding homopolimer bintang PCL disebabkan
oleh perubahan
kumpulan berfungsi terminal akhir. Polimer PCL-b-PEG berbentuk bintang dengan 6 cabang ini kemudiannya dilarutkan dalam pelarut kloroform/metanol dan larutan
yang terhasil digunakan
untuk proses elektroputaran. Morfologi nanogentian yang terhasil
menunjukkan gentian halus tanpa manik
menjadikan gentian ini berpotensi untuk aplikasi yang luas. Kata kunci: Elektroputaran; polikaprolakton; polimer bintang REFERENCES An, J.H.,
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