Reologi, sifat aging, termal, dan swelling dari campuran EPDM/NR dengan bahan pengisi carbon black N220 Rheology, aging, thermal and swelling properties of carbon black N220-filled EPDM/NR

No abstract

Cassava starch filled linear low-density polyethylene (LLDPE) films are made in order to make plastics which environmentally friendly. The use of compatibilizer ethylene-acrylic ester-maleic anhydride polymerized is needed to obtain a compatible mixture of starch which is hydrophilic and LLDPE which is hydrophobic. In this study LLDPE films obtained were tested for tensile strength and elongation before and after accelerated aging and density. Melt flow index (MFI) of the film was also measured to determine the rheological properties. Crystallinity has been done by an X-Ray diffraction. The results showed that the addition of thermoplastic starch tended to reduce the tensile strength, elongation, and MFI values but increase the density of LLDPE films. The aging process at a temperature of 70 °C ± 2 °C for 168 hours ± 2 hours tends to increase the tensile strength but decrease the extension of the break.

Global problems associated with conventional, non-biodegradable plastics have urged the society to use more ecofriendly biodegradable plastics. In this study, linear low-density polyethylene (LLDPE) was co-compounded with cassava-based thermoplastic starch (TPS) to prepare biodegradable plastics (i.e. plastics that can be degraded by microbes), in which three different LLDPE/TPS ratios were studied. Acetic acid was used to hydrolyze the polysaccharides by breaking the branched amylopectin that causes the TPS-containing composites brittle and stiff. The biodegradation properties of the LLDPE/TPS composites were determined by observing the level of microbial growth on the sample surface after incubation with potato dextrose agar medium that was inoculated with Penicillium sp. and Aspergillus niger. Burial test in a humid composting medium was also performed to validate the biodegradation properties. The mass change (%) was calculated in relative to the initial mass before burial test. The physical properties (tensile strength and elongation at break) of the bioplastics were determined using universal testing machine before and after burial treatment. The morphology of the sample surface was evaluated using scanning electron microscopy. The results showed that the microbial growth increases with increasing TPS content. Negative mass changes were observed on all samples that contain TPS, with increase in the magnitude with increasing TPS content. The tensile strength tends to increase in the first 28 days of burial period in a composting medium then decreases and plateaus, while the elongation at break decreases with increasing burial period. Moreover, samples that contain acetic acid showed less microbial attachment and less biodegradation compared to samples that does not contain acetic acid.

Tujuan penelitian adalah untuk mendapatkan perbandingan terbaik penggunaan karet alam (RSSI) dengan karet nitril (NIBR) dalam pembuatan rol karet mesin cetak. Perbandingan karet alamlkaret nitril yang digunakan : 100/0, 90110,80/20,70130,60/40,50/50, 40/60, 30170,20180,10/90.Hasilpengujiansecarakimiamaupunfisikamenunjukkanbahwakompon dengan perbandingan karet alam dan nitril 50/50 memenuhi persyaratan SNI.05-2227-1991 Rol Karet Mesin Cetak. Sifat fisis kompon terbaik sebagai berikut : tegangan putus 5,18 N/ mm2, perpanjanganputus446,glYo,kekerasan 32 shore A., pampat tetap4,llolo, perubahan tegangan putus, perpanjangan putus dan kekerasan setelah pengusangan berturut-turut adalah 23,36yo,21,96yo dan 1,22 shore A, sedangkan perubahan volum dalam NaoH. oli, HCI dan dalam iso oktan berturut-turut adalah 2,41yo,2,96oh,4,67yo dan3,l4yo.