NR / BIIR 블렌드의 물성에 관한 연구

Abstract

Natural rubber(NR) and bromo isobutylene isoprene rubber(BIIR) compounded with other formulation chemicals through polymer blending were manufactured via mechanical mixing method. After manufacturing of rubber vulcanizate with compression molding by hot press, and then cure characteristics, mechanical properties, ozone resistance and dynamic properties of NR/BIIR blends were subsequently measured. As the BIIR contents increased, maximum torque value decreased, however, optimum cure time and scorch time showed a tendency to increase. With loading of BIIR contents, hardness increased and at 75wt% of BIIR hardness showed maximum value and indicated a decreasing tendency at more than 75wt%. While tensile strength and elongation at break decreased with increasing of BIIR contents, however, at 75wt% of BIIR they showed minimum value, and then increased at more than 75wt%. In the ozone resistance test, cracks by ozone were not generated at more than 75wt% of BIIR.