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Effect of water spray on degradation of styrene-butadiene-rubber during accelerated weathering tests
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.polymdegradstab.2020.109379
Makiko Kano , Yoshito Ohtake , Takeshi Yamanobe , Hiroki Uehara

Accelerated weathering tests using a xenon lamp were performed on styrene-butadiene rubber (SBR) under two conditions: only photo irradiation (photo-irradiated condition) and the addition of intermittent water spraying to photo irradiation (photo-irradiated/water-sprayed condition). Degradation mechanisms under these conditions were evaluated based on changes in chemical structure, hardness, and morphology of the exposed surface during weathering tests. The morphology of the exposed surfaces differed significantly between the two weathering conditions. Random minute cracks, known as crazes, were clearly observed under the photo-irradiated/water-sprayed condition. To clarify the origin of such craze propagation, the temperature change accompanying water spraying was traced. A combination of temperature decrease during water spraying and subsequent increase due to water evaporation was repeated under the photo-irradiated/water-sprayed condition. Such periodic temperature change caused the sample to expand and contract; however, the exposed surface could not follow this dimensional change, resulting in craze. This result indicates that water spraying is a degradation factor for accelerated weathering tests on SBR, especially change of surface shape.



中文翻译:

加速老化试验中喷水对苯乙烯-丁二烯橡胶降解的影响

在两个条件下,使用氙气灯在丁苯橡胶(SBR)上进行了加速风化试验:仅光辐照(光辐照条件)和在光辐照中添加间歇喷水(光辐照/水喷雾条件) 。在老化条件下,根据暴露表面的化学结构,硬度和形态变化,评估了这些条件下的降解机理。在两种风化条件下,暴露表面的形态显着不同。在光辐照/喷水条件下,可以清楚地观察到随机的微小裂纹,即所谓的裂纹。为了弄清这种热潮蔓延的起源,追踪了随水喷雾而引起的温度变化。在光照射/喷水条件下,重复进行喷水过程中温度降低和随后因水蒸发而导致温度升高的组合。这种周期性的温度变化导致样品膨胀和收缩。但是,暴露的表面不能遵循此尺寸变化,从而导致开裂。该结果表明,喷水是SBR加速风化试验的降解因子,尤其是表面形状的变化。

更新日期:2020-10-11
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