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High temperature resistant polysulfone/silica double-wall microcapsules and their application in self-lubricating polypropylene

机译：高温耐多合砜/二氧化硅双壁微胶囊及其在自润滑聚丙烯中的应用

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摘要

Polysulfone (PSF)/silica hybrid double-wall microcapsules containing lubricant are synthesized. The lubricant-loaded PSF microcapsules are prepared by a simple solvent evaporation method, and the surface of the PSF microcapsules are modified and activated by dopamine. The activated PSF microcapsules are then microencapsulated again by a silica wall using a sol-gel method. The mean diameter and wall thickness of the synthesized double-wall microcapsules are approximately 90 and 6 mm, respectively. High thermal stability of the microcapsules with a thermal degradation onset temperature of 300 degrees C is obtained. The microcapsules are able to withstand the high-temperature shaping conditions necessary for the polypropylene (PP) composites system used (260 degrees C for 60 min). The silica walls effectively protect the PSF microcapsules from softening transformation. Tribology testing of PP self-lubricating composites incorporating 10 wt% lubricant-loaded microcapsules yields 54.9% and 54.3% reductions in the coefficient friction and wear rate under middle load and middle sliding speed conditions, respectively, compared to the pure PP. The tribological behavior of the self-lubricating PP is further assessed under different applied loads and sliding speed combinations. The formation of a boundary lubricating film from releasing lubricant and the entrapment of wear debris in the cavities left by the ruptured microcapsules are the major self-lubricating mechanisms. These PSF/silica hybrids double-wall microcapsules can be applied to many other polymers to produce unique selflubricating materials.
机译：合成含有润滑剂的聚砜（PSF）/二氧化硅杂化双壁微胶囊。通过简单的溶剂蒸发方法制备润滑剂加载的PSF微胶囊，并且PSF微胶囊的表面被多巴胺改性和活化。然后使用溶胶 - 凝胶法通过二氧化硅壁再次微胶囊来微胶囊。合成的双壁微胶囊的平均直径和壁厚分别为约90和6mm。获得具有300℃的热降解的微胶囊的高热稳定性。微胶囊能够承受所用聚丙烯（PP）复合材料（260℃，60分钟）所需的高温成形条件。二氧化硅壁有效保护PSF微胶囊免受软化转化。与纯PP相比，PP自润滑复合材料掺入10wt％润滑剂加载的微胶囊的PP自润滑复合材料的含量产生54.9％和54.3％，在中间载荷和中间滑动速度条件下减少了54.9％和54.3％。在不同施加的负载和滑动速度组合下进一步评估自润滑PP的摩擦学行为。释放润滑剂的边界润滑膜的形成以及破裂微胶囊留下的腔中的磨损碎片的夹杂物是主要的自润滑机构。这些PSF /二氧化硅杂交物双壁微胶囊可以应用于许多其他聚合物以产生独特的自润滑材料。

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  • 来源
    《RSC Advances》 |2017年第79期|共8页
  • 作者

    Li Haiyan; Ma Yingjie; Li Zhike; Ji Jing; Zhu Yanji; Wang Huaiyuan;

  • 作者单位

    Northeast Petr Univ Coll Chem &

    Chem Engn Prov Key Lab Oil &

    Gas Chem Technol Daqing 163318 Peoples R China;

    Northeast Petr Univ Coll Chem &

    Chem Engn Prov Key Lab Oil &

    Gas Chem Technol Daqing 163318 Peoples R China;

    Northeast Petr Univ Coll Chem &

    Chem Engn Prov Key Lab Oil &

    Gas Chem Technol Daqing 163318 Peoples R China;

    Northeast Petr Univ Coll Civil &

    Architecture Engn Heilongjiang Key Lab Disaster Prevent Mitigat &

    P Daqing 163318 Peoples R China;

    Northeast Petr Univ Coll Chem &

    Chem Engn Prov Key Lab Oil &

    Gas Chem Technol Daqing 163318 Peoples R China;

    Northeast Petr Univ Coll Chem &

    Chem Engn Prov Key Lab Oil &

    Gas Chem Technol Daqing 163318 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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