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Indra Surya, Indra

Departemen Teknik Kimia, Fakultas Teknik Universitas Sumatera Utara

Author-ID : 489458

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Pengaruh Oleamida Terhadap Karakteristik Pematangan Karet Alam Terisi Silika Indra Surya; Philbert
Jurnal Teknik Kimia USU Vol. 10 No. 2 (2021): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

The purpose of this study was as a feasibility study of the utilization of oleamide as a new additive for natural rubber (NR) filled with silica using the semi-efficient vulcanization system. Silica fillers used as much as 30 parts per hundred parts rubber (phr). Oleamide was obtained from the synthesis of oleic acid with urea. Oleamide was inserted into the silica filled NR compounds with the varied composition of 0.0 phr; 2.0 phr; 4.0 phr; 6.0 phr, and 8.0 phr. The influence of oleamide on the curing characteristic of the silica filled NR compounds was observed. It was obtained that the oleamide functions as a curative and also a plasticizer. The greater the levels of oleamide added, the shorter the scorch time and optimum curing time were. Oleamide also decreased the minimum torque with addition up to 8.0 phr. The greater the levels of oleamide was, the lower the minimum torque was. Oleamide also increased the maximum torque and torque difference of the silica-filled NR composites at the addition of 2.0 phr. The 2.0 phr was the optimum composition of the oleamide.

PENGARUH KADAR SILIKA DARI FLY ASH BATU BARA SEBAGAI BAHAN PENGISI HIDROGEL BERBAHAN DASAR SELULOSA BAKTERI (HSB) Indra Surya; Vivi Purwandari; Ani Khodijah
JURNAL KIMIA SAINTEK DAN PENDIDIKAN Vol 6 No 1 (2022): JURNAL KIMIA SAINTEK DAN PENDIDIKAN
Publisher : Program Studi Kimia - Universitas Sari Mutiara Indonesia

In one coal combustion process, about 80% of fly ash is produced and the rest is bottom ash, which is around 20%. The main components of coal fly ash originating from power plants are silica (SiO2), alumina (Al2O3), and iron oxide (Fe2O3), the rest are carbon, calcium, magnesium, and sulfur. Silica is one of the most dominant components of fly ash. Hydrogels obtained without fillers still have a Swelling capacity that is not maximized, it is necessary to process hydrogels with high absorption capabilities. One of the methods used to increase the absorption of hydrogels is to add silica as a voice filler. This study aims to determine the effect of 10, 20, 30, and 40% silica content from coal fly ash as a filler for bacterial cellulose-based hydrogels. Silica was obtained by extracting sodium silicate solution from fly ash followed by the manufacture of silica gel using 3N H2SO4. The resulting silica gel is added to the hydrogel manufacturing process. Hydrogel with silica as a filler which produces water absorption, FTIR, and SEM. The test results show that the silica content of 20% has the highest water absorption capacity of 1290%. With the concentration used, silica precipitation will produce a sharper silica peak in the FTIR results. SEM analysis with the addition of silica with bacterial cellulose produces pores on the HSB surface which can absorb air more quickly. The pores on the surface of the HSB affect the water absorption capacity (hydrophilicity) to increase. The addition of silica precipitated from fly ash waste as a filler in Bacterial Cellulose Hydrogel (HSB) was able to increase the Swelling capacity of HSB

PENGARUH KADAR SILIKA DARI FLY ASH BATU BARA SEBAGAI BAHAN PENGISI HIDROGEL BERBAHAN DASAR SELULOSA BAKTERI (HSB) Indra Surya; Vivi Purwandari; Ani Khodijah
JURNAL KIMIA SAINTEK DAN PENDIDIKAN Vol. 6 No. 1 (2022): JURNAL KIMIA SAINTEK DAN PENDIDIKAN
Publisher : Program Studi Kimia - Universitas Sari Mutiara Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51544/kimia.v6i1.2975

In one coal combustion process, about 80% of fly ash is produced and the rest is bottom ash, which is around 20%. The main components of coal fly ash originating from power plants are silica (SiO2), alumina (Al2O3), and iron oxide (Fe2O3), the rest are carbon, calcium, magnesium, and sulfur. Silica is one of the most dominant components of fly ash. Hydrogels obtained without fillers still have a Swelling capacity that is not maximized, it is necessary to process hydrogels with high absorption capabilities. One of the methods used to increase the absorption of hydrogels is to add silica as a voice filler. This study aims to determine the effect of 10, 20, 30, and 40% silica content from coal fly ash as a filler for bacterial cellulose-based hydrogels. Silica was obtained by extracting sodium silicate solution from fly ash followed by the manufacture of silica gel using 3N H2SO4. The resulting silica gel is added to the hydrogel manufacturing process. Hydrogel with silica as a filler which produces water absorption, FTIR, and SEM. The test results show that the silica content of 20% has the highest water absorption capacity of 1290%. With the concentration used, silica precipitation will produce a sharper silica peak in the FTIR results. SEM analysis with the addition of silica with bacterial cellulose produces pores on the HSB surface which can absorb air more quickly. The pores on the surface of the HSB affect the water absorption capacity (hydrophilicity) to increase. The addition of silica precipitated from fly ash waste as a filler in Bacterial Cellulose Hydrogel (HSB) was able to increase the Swelling capacity of HSB

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