Malaysian Journal of Analytical Sciences Vol 18 No 2 (2014): 299 – 305

SINTESIS HIDROGEL BERASASKAN NATA DE COCO DENGAN ASID AKRILIK SEBAGAI KO-MONOMER MENGGUNAKAN KAEDAH PEMPOLIMERAN RADIKAL BEBAS

(Synthesis of Hydrogel Based on Nata De Coco and Acrylic Acid as Co-Monomer using Free Radical Polymerization Method)

Melissa Liew, Rizafizah Othaman, Rozida Khalid, M.C.Iqbal M.Amin, Azwan Mat Lazim*

Pusat Pengajian Sains Kimia dan Teknologi Makanan

Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

*Corresponding author: azwanlazim@ukm.edu.my

Abstrak

Nata de coco merupakan sejenis selulosa bakteria yang dihasilkan oleh bakteria dari spesis Acetobacter xylinum. Sifatnya yang lebih stabil secara fizikal berbanding selulosa daripada tumbuhan memberikan kelebihan yang luar biasa untuk dibangunkan sebagai hidrogel yang sensitif terhadap persekitaran. Hidrogel selulosa bakteria-ko-asid akrilik disintesis berdasarkan kaedah pempolimeran radikal bebas. Agen pemula , ammonium persulfat (APS)telah digunakan untuk memulakan tindak balas. Manakala agen taut silang, N,N’-metilena bisakrilamida telah digunakan supaya tindak balas pempolimeran menghasilkan jaringan yang lebih baik dan efektif. Ujian pembengkakan ke atas hidrogel dijalankan pada larutan yang mempunyai pH yang berbeza untuk mengenalpasti kebolehan hidrogel bertindak balas terhadap pH persekitaran. Analisis ATR-FTIR dijalankan untuk memastikan wujudnya interaksi molekul antara selulosa bakteria dan asid akrilik. Selain itu, penentuan nilai peralihan kaca (T_g) menggunakan kaedah DSC dijalankan ke atas hidrogel yang berjaya disintesis.

Kata kunci: Nata de Coco, hidrogel, kaedah pempolimeran radikal bebas, asid Akrilik

Abstract

Nata de Coco or known as bacterial cellulose is produced by Acetobacter xylinum where it is more stable than plant cellulose. Moreover, it also provides outstanding advantages to be developed as an environmental responsive hydrogels. In this study the bacterial cellulose-g-acrylic acid hydrogel was synthesized by using a free radical polymerization method. Ammonium persulfate (APS) was used to initiate the reaction, while N,N'-methylene bisacrylamide has been used as the crosslinking agent. In order to test the hydrogel respond, swelling tests were made at different pH. Furthermore, ATR-FTIR analysis was used to determine the interactions between bacterial cellulose and acrylic acid. Finally, the determination of glass transition (Tg) was made by using DSC.

Keywords: Nata de Coco, hydrogel, free radical polymerization, acrylic acid

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