KOMPOSIT POLIMER KARBOKSIMETIL SELULOSA-g-POLI(ASAM AKRILAT)/BENTONIT SEBAGAI SUPERABSORBEN AIR DAN UREA POLYMER COMPOSITE OF CARBOXYMETHYL CELLULOSE-g- POLY(ACRYLIC ACID)/BENTONITE AS SUPERABSORBENT OF WATER AND UREA
| Main Authors: | , IKA NURUL KHOTIMAH, , Bapak Prof. Dr. Sri Juari Santosa, M.Eng |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2014
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/127059/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=67302 |
Daftar Isi:
- Superabsorbent polymer composites (SAPC) are hydrophylic polymers connected by crosslinking which can absorb and retain extraordinary large amounts of water or aqueous solution without being dissolved. Because of their excellent characteristics, SAPC that have been synthesized in this research were applied as absorbent of water and urea for the agriculture purposes. SAPC were synthesized by polymerization proccess with acrylic acid, carboxymethyl cellulose (CMC), and residue of natural bentonite purification were used as main materials. CMC and residue of natural bentonite purification were added in various proportion of weight, i.e. 2.00:0, 1.50:0.50, 1.00:1.00, and 0.50:1.50 but their total weight was maintained constant. N,N�-methylene bisacrylamide (MBA) was used as crosslinker, ammonium persulphate (APS) as initiator, and sodium hydroxide (NaOH) as neutralizer of the acrylic group to form SAPC of carboxymethyl cellulose-g-poly(acrylic acid)/bentonite. The proportion of CMC:residue of natural bentonite purification = 1:1 (SAPC C:B=1:1) showed the highest swelling capacity. SAPC C:B=1:1 could absorb 785.00 g distilled water per g SAPC and had a retention time of water for 40 days. The presence of urea molecules in swelling medium of SAPC C:B=1:1had no obvious influences on the SAPC swelling capacity. Urea and water molecules entered into the polymer network concomitantly. The number of urea molecules entered into the polymer network increased as the concentration of urea molecules in the swelling medium were increased. Urea molecules inside the polymer network can be released within 30 minutes. The swelling capacity and number of absorbed urea molecules decreased by increasing the concentration of CaCO3 in swelling medium as a representative hard water.