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 heat build-up, gas permeability property, thermal property and dynamic mechanical property of NR/BIIR blends were subsequently measured. As the BIIR contents increased, heat build-up and gas permeability property increased linearly. And also decomposition temperature increased with an increasing of BIIR contents, so it was confirmed that thermal stability was improved. However tan δ peak shifted higher temperature with the loading of BIIR contents. It was observed that 60 ℃ tan δ which is an indicator of rolling resistance was increasing with an increasing of BIIR contents.

기계적 혼련 방법으로 천연고무(NR)와 bromo isobutylene isoprene rubber(BIIR)을 다른 배합약품들과 함께 폴리머 블렌드법에 따라 제조하였다. Hot press에 의한 압축 성형법으로 고무 가교체를 제조한 후 NR/BIIR 블렌드의 발열특성, 기체투과도, 열적 성질 및 동적·기계적 성질 등을 측정하였다. BIIR 고무의 첨가량이 증가함에 따라 발열특성 및 내기체투과성은 선형적으로 증가하였다. 또한 BIIR의 함량이 증가할수록 분해 온도가 증가하여 열적안정성이 향상되는 것을 확인하였다. 하지만, BIIR의 함량이 증가할수록 tanδ의 피크는 고온 쪽으로 이동하였다. BIIR의 함량이 증가함에 따라 회전저항의 지표인 60 ℃ tan δ는 증가하는 것이 확인되었다.

Keywords: natural rubber, bromo isobutylene isoprene rubber, vulcanizate, heat build-up, gas permeability property, dynamic mechanical property