Kesan agen taut silang ke atas sifat fizikal dan terma kopolimer akrilamida
Abstract
Membran poli(akrilamida-ko-etilmetakrilat) (P(AAm-ko-EMA)) tertaut silang dengan agen taut silang, N,N-metilenabisakrilamida (MBA) telah berjaya disintesis. Kajian ini dilakukan untuk menilai dan membandingkan sifat fizikal dan terma kopolimer berasaskan akrilamida (AAm) tertaut silang dengan kopolimer tanpa taut silang. Kaedah yang digunakan adalah fotopempolimeran. Spektrum dari analisis Spektroskopi Inframerah Transformasi Fourier (FTIR) menunjukkan kewujudan kumpulan -CH3 dan C-O yang dikesan pada nombor gelombang 1351 cm-1 dan 1122 cm-1 dan ini membuktikan monomer AAm dan EMA telah berjaya dikopolimerkan. P(AAm-ko-EMA) tertaut silang pula menunjukkan puncak yang serupa dengan kopolimer kerana agen taut silang, MBA mempunyai kumpulan berfungsi yang sama dengan PAAm. Selain itu, peratus penyerapan air bagi membran P(AAm-ko-EMA) tertaut silang adalah terendah disebabkan oleh ruang isipadu membran yang lebih kecil dan kurang molekul air boleh masuk ke dalam struktur rangkaian membran. Mikrograf Mikroskop Imbasan Elektron (SEM) bagi membran P(AAm-ko-EMA) tertaut silang menunjukkan permukaan membran adalah lebih sekata dan mempunyai bilangan liang yang paling kurang dan bersaiz kecil. Nilai modulus Young yang tertinggi, iaitu 8671 Pa didapati daripada ujian regangan disebabkan oleh penambahan MBA dan menghasilkan membran bersifat kaku. Termogram termogravimetri (TGA) pula menunjukkan corak penguraian satu peringkat dan penurunan berat yang paling sikit, iaitu 52% untuk P(AAm-ko-EMA) tertaut silang. Membran P(AAm-ko-EMA) tertaut silang yang stabil menunjukkan peratus kehilangan berat yang terendah. Suhu degradasi maximum bagi membran P(AAm-ko-EMA) tertaut silang adalah 390 °C. Kesimpulannya, kopolimer tertaut silang yang terhasil mempunyai sifat fizikal dan terma yang lebih baik serta berpotensi diaplikasi sebagai biosensor.
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