Sifat Fisika Dan Analisis Gugus Fungsi Karet Seal O-ring Dari Bahan Termoplastik Elastomer Nitrile Butadiene Rubber (NBR) Dan Polyvinyl Chloride (PVC)

Abstract

The purpose of this research was to determine the physical properties and functionalgroups on O-ring rubber seals made of thermoplastic elastomers blend NBR and PVC.Composition of the NBR / PVC were successively varied : 90/10; 85/15; 80/20; 75/25; 70/30 and65/35 phr. Mixing process between NBR/PVC with additive used a two roll mill within atemperature of 60º - 80 ºC, the vulcanization process used a hydraulic press at a temperature of170 oC and pressure of 150 kg/cm2. The physical properties were evaluated including tensilestrength, elongation at break, hardness, before and after aging, hardness after immersion inisooctane and swelling while analysis of functional groups was also carried out by method ofFourier Transform Infrared Spectrophotometer (FTIR). The result of the best vulcanized wascharacterized by tensile strength 188.93 kg/cm2, the change of tensile strength after aging 2.50%,elongation at break of 400%, the change of elongation at break after aging was 12.5%, hardness75 shore A, the change of hardness after aging 0%, the change of hardness after immersion inisooctane 1.3%, swelling 0.8% and functional group of vulcanisate was indicated by new peak(OH) at wave band of 3468 cm-1. Those formula met the requirements of the technicalspecifications of ASTM D 2000 seal O-ring