Sains Malaysiana 44(6)(2015): 811–818

 

Self-healing of Poly(2-hydroxyethyl methacrylate) Hydrogel through Molecular Diffusion

(Swa-Pemulihan Hidrogel Poli(2-hidroksietil metakrilat) melalui Penyusupan Rawak Molekul)

 

N.A. SIRAJUDDIN & M.S. MD JAMIL*

Faculty of Science and Technology, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor Darul Ehsan, Malaysia

 

Received: 15 January 2014/Accepted: 15 November 2014

 

ABSTRACT

Synthetic materials that are capable of healing upon damage are being developed at a rapid pace because of their many potential applications. Here, new healing chemically cross-linked hydrogel of poly(2-hydroxyethyl methacrylate) (pHEMA) was prepared. The healing hydrogel was achieved by heating above its glass transition (Tg). The intermolecular diffusion of dangling chain and the chain slippage led to healing of the gel. The peaks in attenuated total reflectance (ATR) confirmed that hydrogel was formed while rheological studies had determined the minimum for healing temperature is 48.5oC. The results showed that ratio stress of the healable hydrogel can reach until 92 and 91% of first and second healing cycle, respectively. The morphology of the sample was carried out to evaluate the self-property of hydrogel.

 

Keywords: Chain slippage; intermolecular diffusion; self-healing hydrogel; temperature

 

ABSTRAK

Keupayaan swa-pemulihan pada bahan sintetik banyak digunakan dalam aplikasi perubatan serta aplikasi-aplikasi yang berkaitan. Suatu hidrogel baharu iaitu poli(hidrosietil metakrilat) telah disediakan melalui tindak balas kimia. Swa-pemulihan hidrogel berlaku apabila diberikan haba melebihi suhu peralihan kaca (Tg) dan gel yang telah dipotong bercantum semula melalui proses penyusupan rawak molekul dan penggelinciran rantai. Puncak spektrum yang ditunjukkan dalam ATR mengesahkan proses taut silang yang berlaku dalam hidrogel tersebut. Suhu pemulihan minimum pula telah ditentukan oleh kajian reologi. Hasil ujian tensil membuktikan kekuatan hidrogel pemulihan berupaya mencapai sehingga 92% pada kitaran pertama dan 91% pada kitaran kedua. Ujian morfologi telah dijalankan bagi mengenal pasti sifat pemulihan hidrogel tersebut.

 

Kata kunci: Penggelinciran rantai; penyusupan molekul; suhu; swa-pemulihan hydrogel

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