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首页> 外文期刊>Journal of Applied Polymer Science >Evaluation of the Properties of Bitumen Modified by SBS Copolymers with Different Styrene-Butadiene Structure
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Evaluation of the Properties of Bitumen Modified by SBS Copolymers with Different Styrene-Butadiene Structure

机译：不同苯乙烯-丁二烯结构的SBS共聚物改性沥青的性能评价

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摘要

Four styrene-butadiene-styrene(SBS) modified bitumens had been prepared by a base bitumen, a crosslinking agent and four SBS copolymers which differ in styrene blocks content and molecular configuration (radial or linear) under the same experimental conditions. Conventional properties, morphology, thermal behavior and microstructure were investigated by means of conventional tests, fluorescence microscopy, differential scanning calorimetry (DSC), and Fourier transform infrared (FT-IR) spectroscopy. In terms of linear SBS polymers, the SBS molecule with the styrene content of 30% has a perfect dispersion and complete stretching in bitumen matrix, and in this case, the conventional properties and thermal stability of bitumen are enhanced substantially. However, the star SBS polymer due to long branched chains forming the preferable steric hindrance to enhance the intensity of base bitumen, plays a more important role in improving the conventional properties of base bitumen than linear SBS polymers. Furthermore, the FT-IR spectra indicate that, the main bands assignations of four modified bitumens are identical and the significant variation is the peak intensity. And a noncomplete crosslinking reaction happens between the bitumen and each SBS polymer, which can efficiently prevent excessive crosslinking from affecting the intrinsic bitumen characteristics.
机译：在相同的实验条件下，通过基础沥青，交联剂和四种SBS共聚物制备了四种苯乙烯-丁二烯-苯乙烯（SBS）改性的沥青，它们的苯乙烯嵌段含量和分子构型（径向或线性）不同。通过常规测试，荧光显微镜，差示扫描量热法（DSC）和傅里叶变换红外（FT-IR）光谱研究了常规性能，形态，热行为和微观结构。就线性SBS聚合物而言，苯乙烯含量为30％的SBS分子在沥青基质中具有完美的分散性和完全的拉伸，并且在这种情况下，沥青的常规性能和热稳定性大大提高。然而，星形SBS聚合物由于长支链形成优选的位阻以增强基础沥青的强度，在改善基础沥青的常规性能方面比线性SBS聚合物起着更重要的作用。此外，FT-IR光谱表明，四个改性沥青的主要谱带分配是相同的，并且最大的变化是峰强度。而且，沥青与每种SBS聚合物之间会发生不完全的交联反应，从而可以有效地防止过度交联影响固有的沥青特性。

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