Asep Riswoko
Center for Material Technology-Agency for the Assessment and Application of Technology Jl. M.H. Thamrin No. 8, Jakarta 10340, Indonesia

Published : 3 Documents
Articles

Found 2 Documents
Search
Journal : Jurnal Sains Materi Indonesia

GRAFTING OF CELLULOSIC PALMITATE-METHYL METHACRYLATE BY ELECTRON BEAM IRRADIATION AND CHARACTERIZATION OF THEIR MEMBRANES MECHANICAL PROPERTIES Riswoko, Asep; Suryanti, Tri
Jurnal Sains Materi Indonesia Vol 12, No 2: FEBRUARI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (333.576 KB) | DOI: 10.17146/jsmi.2011.12.2.4594

Abstract

GRAFTING OF CELLULOSIC PALMITATE-METHYL METHACRYLATE BY ELECTRON BEAM IRRADIATION AND CHARACTERIZATION OF THEIR MEMBRANES MECHANICAL PROPERTIES. A cellulose derivative membrane, cellulosic palmitate, has been modified to give a better mechanical properties of composite membranes. Modification has been carried out by adding methyl methacrylate (MMA) onto cellulosic palmitate with volume ratio 1:1 and then irradiated by electron beam at dosage of 3, 5, 7, 9, and 10 kGy. The best performance of MMA grafted cellulosic membrane was successfully obtained for irradiation dose at 5 kGy which has a tensile strength of 76,92 Kg/cm2 (stronger than that of the original cellulosic palmitate membrane up to 75%). This result is supported by FT-IR spectra which showed that grafting methyl methacrylate onto cellulosic palmitate increased the intensity of absorbance of -CH2- group (1468.47 and 1450.47 cm-1). In addition, there are also strong absorption in region 1068.64 and 1014.56 cm-1 which is absorption for C-O-C (ether linkage) between cellulosic palmitate and methyl methacrylate. X-Ray Diffraction and SEM analysis were also revealed that adding of MMA on cellulosic palmitate affected a degree of crystalline and morphology membrane.
SINTESIS DAN KARAKTERISASI STRUKTUR KRISTALCAIR FEROELEKTRIKTIPE ESTER BENZOAT TURUNAN DARIASAM (S)-(+)-2-METILBUTANOAT Riswoko, Asep; Afrizal, Afrizal; Setioko, Wahyu
Jurnal Sains Materi Indonesia Vol 12, No 3: JUNI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1055.548 KB) | DOI: 10.17146/jsmi.2011.12.3.4611

Abstract

SINTESIS DAN KARAKTERISASI STRUKTUR KRISTALCAIR FEROELEKTRIKTIPE ESTER BENZOAT TURUNAN DARIASAM (S)-(+)-2-METILBUTANOAT. Metode sintesis kristal cair feroelektrik tipe ester benzoat turunan dari asam (S)-(+)-2-metil butanoat telah berhasil dikembangkan melalui metode esterifikasi (S)-(+)-p-hidroksifenil-2-metilbutanoat ((S)-(+)-2-HFM) dengan akriloksi butiloksi benzoat (ABB). Senyawa kiral alkohol (S)-(+)-2-HFM diperoleh dengan esterifikasi Steglich menggunakan hidrokuinon dengan katalis disikloheksil karbodiimida (DCC) dan dimetil amino piridin (DMAP). Sedangkan akrilat ABB diperoleh dari hasil sintesis senyawa induk asam 4-klorobutil asetat melalui pembentukan eter Williamson yang diikuti hidrolisis basa dan dilanjutkan dengan akrilasi. Karakterisasi struktur kristal cair feroelektrik yang berasal dari kedua prekursor ini dengan Fourier Transform - Infra Red (FT-IR) menunjukkan ester dengan gugus karbonil dan fenil tanpa gugus hidroksi. Puncak serapan spektrum FT-IR produk ester (cm-1): 3323,53; 2851,03; 2666,01; 1729,09; 1622,86; 1536,74; 1510,75; 1244,16; dan 1170,16.