Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Influence of Wax Molecular Weights on Wax Migration and Evaporation of Rubber Vulcanizates at Room Temperature

상온 노화 후 고무가황물에서 왁스의 이동과 증발에 미치는 왁스의 분자량 분포

  • Published : 2009.12.31
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Abstract

Ozone caused the crack on the surface of a rubber article by oxidation of double bond at room temperature. Wax migrates to the surface of a rubber article and makes a physical barrier to prevent process of ozonation. We investigated change of molecular weight distribution of waxes in unfilled NR, SBR, and BR vulcanizates before and after aging at room temperature for 6 months. Migration and evaporation behaviors of wax in a rubber article at ambient conditions help understand a role of wax as an antidegradant and appearance contamination of a rubber article. The relative intensity distribution of n-alkanes of the NR specimen after the aging was shifted to higher molecular weight compared with the relative intensity distribution before the aging, while those of the SBR specimen before and after the aging did not show a big difference.

오존은 상온에서 폴리머 이중 결합의 산화작용을 활발하게 하여 표면 갈라짐을 유발시킨다. 왁스는 고무 표면으로 이동하여 물리적 방어막을 형성하여 오존의 작용을 방지한다. 비보강 NR, SBR, BR 가황물을 상온에서 6개월간 노화 시켜 노화 전후의 왁스의 분자량 분포 변화를 조사하였다. 상온 조건에서 고무 가황물에 있는 왁스의 이동과 증발 거동은 노화방지제로서의 왁스의 역할과 고무 제품의 외관 오염을 이해하는데 도움을 준다. NR 시험편에서 알칸의 상대 세기 분포는 노화 후 고분자량쪽으로 이동하였으나 SBR 시험편의 경우에는 노화 전후의 분자량 분포 모양에는 큰 차이가 없었다.

Keywords

References

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