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"Hidrogel homopolimer poliakrilamida dan poli(N-metilol akrilamida) serta hidrogel IPN poliakrilamida-poli(N-metilol akrilamida) disintesis dengan menggunakan metode polimerisasi radikal bebas. Pada proses sintesis dilakukan variasi konsentrasi pengikat silang N,N'-metilen bis akrilamida (MBA) pada jaringan polimernya untuk mengetahui pengaruhnya terhadap swelling. Variasi konsentrasi pengikat silang menyebabkan perubahan matriks hidrogel sehingga rasio swelling akan berbeda. Proses polimerisasi berhasil, ditandai dengan hilangnya puncak C=C dan C-H sp² alkena pada FTIR. Uji swelling dilakukan pada suhu ruang dan variasi pH 3, 5, 7, 9, dan 12 selama 24 jam perendaman.  Hasil swelling hidrogel IPN ditemukan lebih tinggi dibandingkan hidrogel homopolimer dikarenakan keberadaan jaringan kedua. Swelling variasi pH pada hidrogel PNMA dan IPN mempunyai swelling tertinggi pada pH 5. Hidrogel dengan konsentrasi pengikat silang 1% untuk PAAm dan IPN PAAm serta konsentrasi pengikat silang 2% untuk PNMA dan IPN PNMA memiliki swelling tertinggi.

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Homopolymer hydrogel polyacrylamide and poly(N-methylol acrylamide) also IPN hydrogel polyacrylamide-poly(N-methylol acrylamide) were synthesized using the free radical polymerization method. In the synthesis process, variations of concentration N, N'-methylene bis acrylamide (MBA) crosslinkers were used on the polymer network to determine their effect on swelling behaviour. Variations of crosslinker concentration  caused changes in the hydrogel structure and thus the swelling ratio will be different. The polymerization process conducted successfully, which was marked by the loss of the C = C and C-H sp2 alkene peaks at FTIR. Swelling test were carried out at room temperature and pH 3, 5, 7, 9, and 12. The IPN hydrogel swelling ratio was found to be higher than homopolymer hydrogel due to the presence of the second network. The highest swelling behaviour in different pH for PNMA and IPN hydrogels was found at pH 5. Hydrogels with a crosslinking concentration of 1% for PAAm, IPN PAAm and 2% for PNMA, IPN PNMA had the highest swelling."

"Polimer pH-sensitif merupakan polimer yang dapat mengalami perubahan sifat fisik dan kimia akibat perubahan pH. Polimer pH-sensitif dapat diaplikasikan ke berbagai hal, sehingga menarik untuk dipelajari dan diteliti lebih lanjut. Pada penelitian ini, telah disintesis poli((n-butil akrilat)-blok-(N-metilol akrilamida)) (PnBA-b-PNMA) melalui metode ATRP dengan komposisi unit monomer pada PNMA yang divariasikan dan diuji sensitivitasnya terhadap pH, dimana PnBA50-b-PNMA75 merupakan PnBA-b-PNMA yang paling sensitif terhadap pH dan ukuran partikel PnBA50-b-PNMA75 semakin kecil ketika suasana semakin asam atau basa. Selain itu, telah disintesis juga hidrogel P(nBA-ko-NMA) dengan polimerisasi radikal bebas dengan divariasikan jumlah nBA dan pengikat silang serta diuji sensitivitasnya terhadap pH, dimana hidrogel P(nBA25-ko-NMA75) (MBA 1%) merupakan hidrogel P(nBA-ko-NMA) yang paling sensitif terhadap pH dan kemampuan swelling pada hidrogel P(nBA-ko-NMA) semakin besar ketika suasana semakin asam atau basa. Selain itu, kemampuan swelling hidrogel semakin kecil ketika jumlah nBA bertambah, sedangkan semakin besar ketika konsentrasi MBA meningkat dari 0,25% hingga 1%.......A pH-sensitive polymer is a polymer that can experience changes in physical and chemical properties due to changes in pH. pH-sensitive polymers can be applied to various things and thus, it become an interesting field to study. In this research, poly((n-butyl acrylate)-block-(N-methylol acrylamide)) (PnBA-b-PNMA) were synthesized via ATRP by varying the monomer composition of PNMA and study their sensitivity to pH, where PnBA50-b-PNMA75 was the most pH-sensitive PnBA-b-PNMA and the particle size of PnBA50-b-PNMA75 decreases in acidic or basic condition. Furthermore, P(nBA-co-NMA) hydrogels were synthesized via free radical polymerization by varying the amount of nBA and study their sensitivity to pH, where P(nBA25-co-NMA75) (MBA 1%) hydrogel was the most pH-sensitive P(nBA-co-NMA) hydrogel and the swelling ability of P(nBA-co-NMA) hydrogels increases in acidic or basic condition. Moreover, the swelling ability of hydrogel decreases by increasing the amount of nBA, but increases by increasing of the concentration of MBA from 0.25% to 1%."