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All Journal Majalah Kulit, Karet, dan Plastik Jurnal Kimia Terapan Indonesia JURNAL SELULOSA

Nuri Astrini

Unknown Affiliation

Author-ID : 2864675

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Materials Science & Nanotechnology

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Optimasi produksi hidrogel CTS-G-PAA/PVA sebagai adsorben menggunakan metode respon permukaan (RSM) Desak Gede Sri Andayani; Nuri Astrini; Lik Anah
Majalah Kulit, Karet, dan Plastik Vol 34, No 1 (2018): Majalah Kulit, Karet dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Kitosan (poli-ß-1,4-glukosamin) merupakan polimer alami bersifat tidak larut dalam air dan pelarut organik, hidrofilik, biocompatible dan biodegradable. Gugus amino pada kitosan lebih mudah berubah menjadi kation dalam larutan asam sehingga sangat kuat menyerap anion dengan daya tarik elektrostatik. Dengan menambahkan dan mencampur polimer sintetik pada rasio yang tepat akan meningkatkan sifat-sifat kitosan sebagai biopolimer dalam menangani permasalahan lingkungan. Tujuan penelitian ini adalah untuk mengkaji kapasitas penyerapan air dan pembentukan hidrogel pada berbagai variasi kitosan terhadap polimer sintetis. Percobaan dilaksanakan dengan metode respon permukaan menggunakan perangkat lunak Design Expert 6,06, 46 variasi percobaan, dan delapan center point dengan kapasitas penyerapan air (g/g) sebagai respon. Proses dilakukan pada sistem batch, inert atmosphere, skala reaktor 1 L dengan kondisi operasi adalah suhu 90°C dan waktu proses selama 4 jam. Variasi biopolimer dan polimer sintetis sebagai berikut: kitosan (CTS): (0,15-1,2) g, acrylic acid (AA): (2-4,5) g, polyvinylalcohol (PVA): (0,5-3) g, benzoylperoxide (BPO): (0,03-0,13) g, methylene bis-acrylamide (MBA): (0,01-0,21) g. Data dianalisis menggunakan ANOVA pada taraf signifikan 95%. Kapasitas penyerapan air (WAC) selama 24 jam diukur dengan teknik gravimetri. Hasil penelitian menunjukkan bahwa variasi campuran kitosan sebagai biopolimer dengan polimer sintetis mempengaruhi kapasitas penyerapan air dan pembentukan hidrogel. Kapasitas penyerapan air optimum adalah 18,6 (g/g) pada komposisi (g): CTS 0,67; AA 3,25; PVA 1,75; BPO 0,08 dan MBA 0,11. Terbentuknya hidrogel sangat dipengaruhi oleh rasio campuran antara polimer alam, monomer, polimer sintetis, inisiator dan agen ikatan silang.

STUDI AWAL SINTESA CARBOXY METHYL CELLULOSE-GRAFTPOLY(ACRYLIC ACID)/MONMORILONIT SUPERABSORBEN POLIMER HIDRO GEL KOMPOSIT MELALUI PROSES KOPOLIMERISASI CANGKOK (PRELIMINARY STUDY ON SYNTHESIS OF CARBOXY METHYL CELLULOSEGRAFT-POLY(ACRYLIC ACID)/MONTMORILLONITE SUPERABSORBEN COMPOSITES HYDRO GEL POLYMER BY GRAFT COPOLYMERIZATION) Lik Anah; Nuri Astrini; Asep Nurhikmat; Agus Haryono
JURNAL SELULOSA Vol 45, No 01 (2010): BERITA SELULOSA
Publisher : Center for Pulp and Paper

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A carboxymethyl cellulose-graft-poly(acrylic acid)/montmorillonite superabsorbent polymer composite (SAPCs) or hydro gel was prepared by graft-copolymerization among carboxymethyl cellulose (CMC), acrylic acid (AA), and montmorillonite (MMT) in aqueous solution. In this research, factors influencing water absorbency or swelling ratio of the hydro gel such as reaction of temperature, concentration of benzoylperoxide (BPO) initiator and concentration of methyl bisacrylamide crosslinker (MBA) were studied. As fixed variable were used time of reaction is five hours and speed of mechanic agitation is 300 rpm. Hydro gel acquired the highest equilibrium water absorbency of 126.56 g/g when ratio of AA to CMC is 10 : 1; 2.5 wt% BPO; 3.75 wt% MBA; and 10 wt% MMT was incorporated. In this experiment the hydro gel PAA Absorb commercial was used as standard that has equilibrium water absorbency of 123 g/g. The graft-copolymerization reaction mechanism, morphology, and thermal stability of the composites were also investigated by FTIR, SEM, and TGA, respectively. FTIR spectra showed –OH of CMC participated in graft polymerization with AA. The introduced CMC and MMT endowed the composite a higher thermal stability.Keywords : CMC-g-poly(AA)/MMT, superabsorbent polymer composites, hydro gel, BPO, MBA INTISARIMaterial superabsorben polimer komposit (SAPCs) atau hidro gel karboksimetil selulosa – cangkok - asam poliakrilat / monmorilonit dipersiapkan melalui proses graft-kopolimerosasi antara karboksimetil selulosa, asam akrilat (AA), dan monmorilonit (MMT) dalam larutan encer. Dalam penelitian ini telah dipelajari faktor-faktor yang berpengaruh terhadap kemampuan hidro gel dalam menyerap air seperti suhu reaksi, konsentrasi inisiator benzoil peroksida (BPO), dan konsentrasi pengikat silang metil bisakrilamida (MBA). Variabel tetap yang digunakan adalah waktu reaksi 5 jam dan kecepatan pengadukan 300 rpm. Hidro gel hasil penelitian memberikan serapan air atau swelling ratio tertinggi 126,56 g H2O/g hidro gel pada kondisi operasi yaitu rasio AA terhadap CMC adalah 10 : 1, konsentrasi BPO 2,5% w/w, MBA 3,75% w/w, dan MMT 10% w/w. Hidro gel PAA Absorb komersial digunakan sebagai standar dengan kesetimbangan penyerapan air123 g/g. Mekanisme reaksi kopolimerisasi cangkok, morfologi, dan kestabilan panas dari SAPCs dipelajari melalui analisa FTIR, SEM, dan TGA. Hasil spektra FTIR menunjukkan gugus fungsional –OH dari CMC berperan aktif dengan AA. Penggunaan CMC dan MMT dalam proses kopolimerisasi cangkok telah memberikan kestabilan panas yang lebih tinggi pada material hidro gel.Kata kunci : CMC-g-poli(AA)/MMT, superabsorben polimer komposit, hidro gel, BPO, MBA

KARAKTERISASI POLIMER BAHAN ADESIF UNTUK KULIT DAN PLASTIK Roestamsjah Roestamsjah; Nuri Astrini
Jurnal Kimia Terapan Indonesia Vol 3, No 2 (1993)
Publisher : Research Center for Chemistry - LIPI

Characterization of polymer of five commercially available elastomeric adhesives claimed 'suitable for leather and plastics had been conducted. Polymer samples were isolated from adhesive solutions by precipitation, and then characterized through FTIR spectroscopy, viscometry, GPC and thermal analysis. The FTIR spectrogram, indicate that five different samples of adhesives contained polychloroprene. Thermal analysis indicated similar glass transition points (Tg) of -40 to -43°C and three of them indicated the second glass transitions at 1.4; 3.6 and 13.5°C, Five adhesives indicated melting points (Tm) of polymers at 43 - 48°C, The average viscosity molecular weight (Mv) indicated two groups; i.e. Mv: 115,000 - 146,000 and Mv : 357,000 - 425,000. From secondary sources, polychloroprene has solubility parameter 8= 8.2 - 9.4 (cal em -3)0.5 or 16.74 - 19.13 (kJ m-3)0.5 and critical surface tension Yc = 38 dyne cmr-1 or mN m-1.

CHARACTERIZATION OF RUBBER-MODIFIED POLYPROPYLENE Nuri Astrini; E. L. Bedia; A. Sudarisrman
Jurnal Kimia Terapan Indonesia Vol 4, No 1 (1994)
Publisher : Research Center for Chemistry - LIPI

Blending of 10, 20, 30, 40, and 50% ethylene-propylene random copolymer known as EPM with polypropylene (PP) was conducted and the blends were characterized using wide-angle x-ray scattering (WAXS), differential scanning calorimetry (DSC), scanning electron microscope (SEM), Tensile and Impact tester. As shown in WAXS diffractograms, PP retains its crystalline structure when blended with EPM. DSC analysis suggests that the polymer blend consists of two phase systems, one crystalline and one amorphous. Morphological observation of the polymer blend using SEM shows that the EPA-f globular structure cavitates the PP matrix which further indicates that the polymer blend is only partially compatible. As EPM increases, the tensile yield stress, stress-strain curve and modulus of elasticity decrease. Impact strength on the other hand, increases and showed remarkable effect at 30% EPM - 70% PP.

Co-Authors A. Sudarisrman Agus haryono Asep Nurhikmat Desak Gede Sri Andayani E. L. Bedia Lik Anah Lik Anah ROESTAMSJAH ROESTAMSJAH

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