Sains Malaysiana 47(6)(2018): 1117–1122

http://dx.doi.org/10.17576/jsm-2018-4706-06

Synthesis and Thermal Properties of Poly(ethylene glycol)-polydimetylsiloxane Crosslinked Copolymers

(Sintesis dan Sifat Terma Kopolimer Taut Silang Poli(etilena glikol)-polidimetilsiloksana)

AIN ATHIRAH ZAINUDDIN¹, RIZAFIZAH OTHAMAN¹, WAN SYAIDATUL AQMA WAN MOHD NOOR¹, TAKENO AKIYOSHI², TAKAHASHI SHINYA² & FARAH HANNAN ANUAR^1*

¹School of Chemical Sciences and Food Technology, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University

1-1 Yanagifo, Gifu-shi, Gifu 501-1193, Japan

Received: 15 September 2017/Accepted: 28 November 2017

ABSTRACT

Poly(ethylene glycol)-polydimethylsiloxane (PEG-PDMS) crosslinked copolymers with mol ratios PEG:PDMS:Glycerol of 5:3:2, 6:2:2 and 7:1:2 have been prepared and characterized. The synthesis of the copolymers was carried out by the reaction between hydroxyl groups of PEG, PDMS and glycerol with isocyanate groups of 1,6-hexamethyelene diisocyanate (HMDI). In the reaction, glycerol was acted as the cross linker. The copolymers were then characterized by FTIR spectroscopy. The thermal behaviour was investigated by DSC and TGA. Based on FTIR results, the crosslinked structure of the copolymers was confirmed by the presence of absorption peak at 3350 and 1710 cm-1 which indicated the (-N-H) stretching and carbonyl (-C=O) correspond to urethane links. This showed that the hydroxyl groups of PEG, PDMS and glycerol have reacted to isocyanate groups of HMDI. The copolymers showed melting temperature (Tm) of PEG segments from 22°C to 27°C and glass transition temperature (Tg) from -11°C to -6°C. Meanwhile, the PDMS segment showed values from -53°C to -56°C for Tm, and Tg from -118°C to -122°C. Data obtained from the thermal analysis indicate that thermal stability increases with increasing PDMS mol ratio.

Keywords: Crosslinked copolymer; polydimethylsiloxane; poly(ethylene glycol); thermal

ABSTRAK

Kopolimer taut silang poli(etilena glikol)-polidimetilsiloksana (PEG-PDMS) dengan nisbah PEG:PDMS:Gliserol 5:3:2, 6:2:2 dan 7:1:2 telah disediakan dan dicirikan. Sintesis kopolimer dilakukan dengan tindak balas kumpulan hidroksi PEG, PDMS dan gliserol dengan kumpulan isosianat 1,6-heksametilena diisosianat (HMDI). Dalam tindak balas ini, gliserol berperanan sebagai agen taut silang. Kesemua kopolimer kemudiannya dicirikan oleh spektroskopi inframerah (FTIR). Ciri terma kopolimer dilihat berdasarkan analisis kalorimetri imbasasan kebezaan (DSC) dan analisis termogravimetrik (TGA). Berdasarkan spektrum inframerah, struktur taut silang kopolimer ditentukan oleh kehadiran puncak serapan pada 3350 dan 1710 cm-1 yang menunjukkan regangan (-N-H) dan kumpulan karbonil (-C=O) yang sepadan dengan pautan uretana. Ini menunjukkan bahawa kumpulan hidroksi PEG, PDMS dan gliserol telah bertindak balas dengan kumpulan isosianat HMDI. Kopolimer menunjukkan suhu lebur (Tm) bagi segmen PEG daripada 22°C hingga 27°C dan suhu peralihan kaca (Tg) daripada -11°C hingga -6°C. Sementara itu, segmen PDMS menunjukkan nilai daripada -53°C hingga -56°C untuk Tm, dan Tg daripada -118°C hingga -122°C. Kestabilan degradasi kopolimer pula meningkat apabila nisbah mol PDMS meningkat.

Kata kunci: Kopolimer taut silang; polidimetilsiloksana; poli(etilena glikol); terma

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*Corresponding author; email: farahhannan@ukm.edu.my