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All Journal Majalah Kulit, Karet, dan Plastik Jurnal Litbang Industri
Muhammad Sholeh
Center for Leather, Rubber, and Plastic, Jl. Sokonandi No. 9 Yogyakarta
Engineering Industrial & Manufacturing Engineering

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Kinetic studies on thermal degradation of natural rubber/butyl rubber Muhammad Sholeh; ihda Novia Indrajati; Arum Yuniari
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (556.209 KB) | DOI: 10.20543/mkkp.v34i1.3460

Abstract

The knowledge of how rubber breakdown on heating in oxidative environment is important in processing and using the material. In the present work, we performed thermogravimetric analysis and utilized three iso-conversional kinetic models to get apparent activation energies of thermal degradation of natural rubber/butyl rubber. Blending of RSS/butyl and additives was done using a laboratory two-roll mill. Cure time of the blended compound was determined by a moving die rheometer. The compound was compression moulded at 160°C with a pressure of 150 kg/cm2 using a laboratory hot press. Thermogravimetric analysis was carried out from 30°C to 800°C in air flow of 200 ml/min with heating rates of 5, 10, 15, and 20°C/min. The kinetic parameters were determined by three isoconversional models (Kissinger, Doyle, and Flynn–Wall–Ozawa model).  The result revealed that the thermal decomposition of the blend occurs in two stages, DTG peaks tends to shift to a higher temperature and the values of DTG peaks increase with the increase of heating rate, and the three isoconversional models gave similar apparent activation energies. The activation energy obtained can be used to predict thermal lifetime of the material.
Pengaruh bahan pengisi serat kaca terhadap sifat fisik dan kristalinitas polipaduan PC/ABS Dwi Wahini Nurhajati; Muhammad Sholeh; Ihda Novia Indrajati; Ike Setyorini
Majalah Kulit, Karet, dan Plastik Vol 33, No 1 (2017): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (957.654 KB) | DOI: 10.20543/mkkp.v33i1.2770

Abstract

This research aimed to determine the effects of the addition of glass fibers on the physical and crystallinity properties of PC/ABS polyblends. The ratio of PC/ABS used in this research was 75/25, while the addition of glass fibers ranged from 0; 5; 10; to 15 phr (based on the weight of PC/ABS). Polyblends of PC/ABS/glass fibers were prepared in a twin screw extruder. The test results showed that density and tensile strength of PC/ABS polyblends increased with an increase in the glass fiber content. The presence of glass fibers decreased MFI and impact strength of these PC/ABS polyblends. The functional groups were determined by the fourier transform infrared (FTIR) spectrophotometer while crystallinity was examined using X-ray diffractometer (XRD).Keywords: PC/ABS polyblend, glass fiber, physical properties, crystallinity.
Pengujian dispersi silika dalam karet menggunakan mikroskop optik Muhammad Sholeh; Ike Setyorini
Jurnal Litbang Industri Vol 13, No 1 (2023)
Publisher : Institution for Industrial Research and Standardization of Industry - Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24960/jli.v13i1.7768.19-24

Abstract

Kualitas dispersi bahan pengisi dalam karet sangat mempengaruhi sifat fisis dari vulkanisat karet. Metode baku pengujian dispersi silika dalam karet (ISO 11345-2006) merupakan metode pengujian kualitatif sehingga hasilnya bersifat subyektif. Tujuan penelitian ini adalah menguji metode yang merupakan penggabungan mikroskop optik dan perangkat lunak ImageJ untuk mendapatkan metode pengujian dispersi silika dalam karet secara kuantitatif. Alat yang dipergunakan untuk mengevaluasi dispersi silika yaitu mikroskop optik Arcs. Karet yang dipergunakan yaitu karet alam dan styrene butadiene rubber (SBR). Pengisi yang dipergunakan yaitu abu bagas, xerogel, dan silika terpresipitasi. Proses komponding menggunakan Haake Rheomix dilanjutkan two roll mill dengan variasi kadar silika terpresipitasi 0-60 phr. Pengujian dispersi silika dalam vulkanisat karet dilakukan dengan memotong lembaran berukuran 2 mm, kemudian penampang potongan tersebut diperiksa dengan faktor perbesaran 112,5 kali. Hasil penelitian menunjukkan bahwa silika terpresipitasi menghasilkan dispersi terbaik. Silika terpresipitasi menghasilkan dispersi dalam karet alam dengan fraksi aglomerat sebesar 0,48%, disusul xerogel (2,21%) dan abu bagas (11,19%). Dispersi silika dalam karet alam lebih baik dibandingkan dengan karet SBR. Dispersi silika terpresipitasi dalam karet alam semakin baik dari 0-60 phr sedangkan dalam karet SBR mencapai optimum pada 30 phr. Gambar mikroskop optik yang diolah dengan perangkat lunak ImageJ mampu memberikan informasi kuantitatif rating dispersi silika dalam matriks karet.
Co-Authors Arum Yuniari Dwi Wahini Nurhajati Ihda Novia Indrajati Ihda Novia Indrajati Ike Setyorini Ike Setyorini