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人工氣候老化對熱塑性彈性體SBS結構與性能的影響

Effects of artificial weathering on the structure and mechanical properties of thermoplastic elastomer SBS

  • 摘要: 利用紫外老化試驗箱,對熱塑性彈性體SBS進行人工加速老化實驗,采用色度計、顯微鏡、傅里葉變換紅外光譜儀和力學試驗機研究人工氣候老化對SBS的顏色、表面形貌、顯微結構和力學性能的影響.結果表明:隨著老化時間的延長,SBS表面顏色逐漸變黃,裂紋逐漸變密,有羰基>C=O生成,試樣的斷裂強度、扯斷伸長率和撕裂強度先迅速降低,然后趨于穩定;而邵氏硬度隨老化時間逐漸增大;其力學性能向硬而脆的方向發展;扯斷伸長率變化幅度是檢測降解變化的最明顯指標.

     

    Abstract: Artificial accelerated weathering test on thermoplastic elastomer SBS was conducted by using a fluorescent UV/condensation weathering device. The changes in surface color, morphology, structure and mechanical properties were monitored by spectrometer, microscope, Fourier transform infrared spectroscopy and tensile testing machine. The results showed that the surface color of SBS turned to yellow with increasing aging time, and the cracks became dense gradually. Carbonyl (>C=O) group was observed from ATR FTIR spectrum. The elongation at break, tensile stress at break and tear strength decreased quickly in the initial stage of aging procedure and then stabilized, while the Shore A hardness increased with the increase of aging time. The mechanical properties turned to be hard and brickle with the evolvement of aging. The change of elongation at break can be used to detect the degradation of SBS.

     

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