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Modification of asphalt binder by the blend of chemically grafted thermoplastics and SBS: Influence of blend composition, chemical grafting, sulphur content, and MFI value
Polymer Bulletin ( IF 3.2 ) Pub Date : 2021-09-04 , DOI: 10.1007/s00289-021-03868-7
Akanksha Pandey 1 , Alok Sharma 1 , Sham S. Ravindranath 1
Affiliation  

Thermoplastic elastomers, such as styrene–butadiene–styrene (SBS), significantly enhance the properties of asphalt binders. This study first highlights the drawbacks of binder modification using chemically grafted polyethylene (g-PE) and then demonstrates the process by which g-PE can be used in combination with SBS. The important role of chemical grafting, sulphur content, and melt flow index (MFI) value in obtaining practically usable ‘g-PE/SBS’ modified binders have been illustrated. The results show that ungrafted and g-PE produces modified binders with highly inferior properties, and the polymers phase separate from the binder within few hours of preparation. % Elastic recovery of the ungrafted and g-PE modified binders was < 30%, and the softening point was 10 to 25 °C lower than SBS modified binders. Modification using the ‘50/50’ g-PE/SBS blend also resulted in inferior modified binders. On the other hand, the ‘25/75’ g-PE/SBS blend resulted in modified binders with properties similar to SBS modified binders. Chemical grafting, sulphur content of 0.21 wt.%, and melt flow index value > 2 are the essential factors that resulted in acceptable ‘25/75’ g-PE/SBS modified binders. Cost analysis shows that the use of g-PE can reduce the overall cost of asphalt pavement. The strategy illustrated in this study can be adopted for low-cost polymers and the effective utilization of waste plastics.



中文翻译:

通过化学接枝热塑性塑料和 SBS 的混合物改性沥青粘合剂:混合物成分、化学接枝、硫含量和 MFI 值的影响

热塑性弹性体,如苯乙烯-丁二烯-苯乙烯 (SBS),显着增强了沥青粘合剂的性能。该研究首先强调了使用化学接枝聚乙烯 ( g- PE)改性粘合剂的缺点,然后展示了g- PE 可以与 SBS 结合使用的过程。已经说明了化学接枝、硫含量和熔体流动指数 (MFI) 值在获得实际可用的 ' g -PE/SBS' 改性粘合剂中的重要作用。结果表明,未接枝和g- PE 产生的改性粘合剂性能非常差,聚合物在制备后的几个小时内与粘合剂相分离。% 未接枝和g 的弹性恢复-PE改性粘合剂<30%,软化点比SBS改性粘合剂低10~25℃。使用“ 50/50 ”-PE/SBS 共混物进行改性也导致改性粘合剂质量较差。另一方面,“ 25/75 ”-PE/SBS 共混物产生的改性粘合剂具有与 SBS 改性粘合剂相似的性能。化学接枝、0.21 wt.% 的硫含量和熔体流动指数值 > 2 是产生可接受的“ 25/75 ” g -PE/SBS 改性粘合剂的基本因素。成本分析表明,使用g- PE可以降低沥青路面的综合成本。本研究中阐述的策略可用于低成本聚合物和废塑料的有效利用。

更新日期:2021-09-04
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