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Kinetic analysis of thermal degradation of NR/EPDM blends with maleic anhydride as compatibilizer: The eﬀect of the reactive accelerators Hesty Eka Mayasari; Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 33, No 2 (2017): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Thermal characteristic is important to determine the thermal resistance of a polymer. In this work, the thermal characteristics of the NR/EPDM blends was investigated to study the storage and application condition of the blends. The NR/EPDM blends were prepared in the two-roll mill by using MAH as a compatibilizer with several types of accelerators, i.e., MBTS from thiazole group, the combination of MBTS and TMTD from thiuram group, and TBBS from sulphenamide group. This research used the thermogravimetric method with the heating rate of 10, 15, and 20ºC/min. The kinetic parameters are calculated by using Coats-Redfern equation. The degradation of NR/EPDM blends occurs in two stages (frst stage at 220-420ºC and second stage at 420-520ºC). Combination of MBTS and TMTD give higher energy activation (112.236 kJ/mol), followed by MBTS-blend (111.999 kJ/mol), and TBBS-blend (110.856 kJ/mol). Combination of MBTS and TMTD accelerator with MAH as the compatibilizer is the proper choice for NR/EPDM blends to get a good thermal stability.

Spektroscopi FTIR dan sifat mekanik nanokomposit grafting HDPE dan nanoprecipitated calcium carbonate (NPCC) Arum Yuniari; Emiliana Kasmudjiastuti
Majalah Kulit, Karet, dan Plastik Vol 28, No 2 (2012): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

ABSTRACTThe purpose of this research based on high density polyethylene (HDPE) and nanoprecipitated calciumcarbonate (NPCC) was to evaluate the effect of nanoprecipitated calcium carbonate (NPCC) on FTIR spectroscopy and mechanical properties. The nanocomposites was prepared with a rheomix 3000 Haake at 180 º C and 50 rpm of rotor speed for 10 minutes. The composition of HDPE and additives were permanently, and NPCC content varied 10, 15, 20, 30, 40 and 50 phr (per hundred resin) respectively and control was made inherent NPCC. The nanocomposites were characterized using tensile strength, hardness tester, electro densimeter and Fourier Transform Infra Red (FTIR) spectroscopy techniques. The results of mechanical properties showed that the increasing the amount of NPCC was able increase hardness and density while elongation at break more stable and tensile strength decreased. Analysis functional group on nanocomposites with Fourier Transform Infra Red (FTIR) indicated a new peak on wave band 3472,49 cm-1 (OH stretching).ABSTRAKPenelitian tentang pembuatan nanokomposit dari bahan high density polyethylene(HDPE) dan nanoprecipitated calciumcarbonate (NPCC) bertujuan untuk mengetahui pengaruh penambahan filler NPCC terhadap sifat mekanik dan spektroscopi. Nanokomposit dibuat dengan Rheomix 3000 Haake pada suhu 180oC dan kecepatan 50 rpm selama 10 menit. Komposisi HDPE dan bahan aditif dibuat tetap, dan kandungan NPCC divariasi berturut-turut 10 ; 20 ; 30; 40 dan 50 phr (per hundred resin) dan dibuat kontrol tanpa ditambah NPCC. Sifat mekanik diuji dengan alat ujitensile strength, hardness, densimeter dan karakterisasi gugus fungsi ditentukan menggunakan Fourier Transform Infra Red (FTIR). Hasil uji sifat mekanik menunjukkan semakin tinggi jumlah NPCC kekerasan dan densitas naik, kemuluran tetap sedangkan kuat tarik cenderung turun. Spektrum nanokomposit HDPE/NPCC menunjukkan terjadinya puncak baru pada bilangan gelombang 3472,49 cm-1 (OH stretching).

Karakteristik sifat mekanik, ketahanan api dan pembakaran, dan morfologi nanokomposit campuran PVC dan LDPE Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 30, No 1 (2014): 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 | DOI: 10.20543/mkkp.v30i1.117

The purpose of the study was to determine the effect of addition of low density polyethylene (LDPE) and flame retardant on mechanical properties, resistant to fire and burning and morphology from the mixture of polyvinyl chloride (PVC), LDPE, flame retardant, and nanoprecipitated calcium carbonate (NPCC) as filler. The materials were mixed in laboplastomill at 215 ºC, torque speed 50 rpm, for 10 minutes. Nanocomposite was prepared by PVC/LDPE variations of 100/15; 100/20; 100/25; and 100/30 phr and flame retardant variations of 30 and 35 phr. The results showed that the hihger of LDPE in nanocomposite increased the hardness and impact resistance, however, it decreased the tensile strength, elongation at break, and density. Addition of flame retardant to the nanocomposites showed good resistance to fire and burning, and optimum mechanical properties were found in using of 35 phr flame retardant.The morphology of the nanocomposite, were observed by Scanning Electron Microscope (SEM) confirmed that homogeneous mixture of LDPE dispersed in the PVC matrix.ABSTRAKTujuan penelitian adalah untuk mengetahui pengaruh penambahan low density polyethylene (LDPE) dan flame retardant terhadap sifat mekanik, ketahanan terhadap api dan pembakaran serta morfologi nanokomposit campuran polyvinyl chloride (PVC) dan LDPE. Nanokomposit dibuat dari campuran PVC, LDPE, flame retardant dan nanoprecipitated calcium carbonate (NPCC) sebagai filler. Bahan-bahan dicampur menggunakan laboplastomill pada suhu 215 ºC, kecepatan torsi 50 rpm selama 10 menit. Nanokomposit PVC/LDPE dibuat dengan variasi 100/15; 100/20; 100/25 dan 100/30 phr serta variasi flame retardant (FR) 30 dan 35 phr. Hasil uji menunjukkan bahwa jumlah LDPE naik dalam nanokomposit: kekerasan dan ketahanan pukul takik menunjukkan kenaikan, tetapi kuat tarik, kemuluran, dan berat jenis turun. Penambahan flame retardant menyebabkan nanokomposit mempunyai ketahanan yang baik terhadap api dan pembakaran, dan optimun sifat mekanik diperoleh pada penggunaan flame retardant 35 phr. Morfologi nanokomposit campuran PVC dan LDPE diamati dengan Scanning Electron Microscope (SEM), campuran homogen LDPE terdispersi pada matriks PVC.

Karakteristik termogravimetri dan kinetika dekomposisi EPDM dengan bahan pengisi carbon black Hesty Eka Mayasari; Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 32, No 2 (2016): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The thermal characteristics of a material are important to learn in order to know the thermal stability of the materials. Ethylene propylene diene monomer (EPDM) is a synthetic rubber that is widely used in industry due to its resistance to aging, ozone, and chemicals. The kinetic parameters and thermal decomposition of vulcanized EPDM were studied using thermogravimetric method with various vulcanization systems (efficient, semi-efficient, and conventional vulcanization system) and various carbon black (CB) as filler (50, 60, and 70 phr). Decomposition consist of two stages; the oxidation of EPDM and volatile matter loss then decomposition of EPDM. Kinetic parameters of the thermal decomposition were approximated by the Coats Redfern equation. Activation energy and decomposed mass increases with decreasing content of CB. Vulcanized EPDM with CB as filler has fairly good resistance against thermal decomposition. The decomposition process can be viewed in detail in this paper.Keywords: EPDM, thermal decomposition, kinetic, thermogravimetric, carbon black.

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