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Ageing properties and polymer/fuel interactions of polyamide 12 exposed to (bio)diesel at high temperature
npj Materials Degradation ( IF 5.1 ) Pub Date : 2019-01-04 , DOI: 10.1038/s41529-018-0065-y
Xin-Feng Wei , Loris De Vico , Pierre Larroche , Kai J. Kallio , Stefan Bruder , Martin Bellander , Ulf W. Gedde , Mikael S. Hedenqvist

Biodiesel derived from oil crops and animal fats has been developed as a promising carbon-neutral alternative to petroleum fuels in the transport sector, but the compatibility between biodiesel/petroleum diesel and polymer components in the automotive fuel system has not been free from controversy. In this present study, the degradation of polyamide 12 (PA12), one of the most common polymers used in vehicle fuel systems, has been investigated after exposure to petroleum diesel, biodiesel and a mixture of these (20 vol.% of biodiesel/80 vol.% petroleum diesel). Fuel sorption kinetics, glass transition temperature data and mechanical properties all showed that the fuels plasticized the PA12. In addition, monomers and oligomers were extracted from PA12 by the fuels. The long-term exposure led to oxidation and an annealing-induced increase in crystallinity of the polymer. The plasticization, oxidation and annealing effects were combined with the tensile mechanical properties to assess the overall degree of ageing and degradation of the PA12 material. The fuel-polymer interactions and ageing mechanisms, demonstrated here at high temperature for PA12, are 'generic' in the sense that they are also expected to occur, to various degrees, with many other polymers and they indicate that care should be taken when choosing polymers in applications where they will be exposed to fuels at high temperature.



中文翻译:

高温下暴露于(生物)柴油的聚酰胺12的老化性能和聚合物/燃料相互作用

在交通运输领域,已开发出从油料作物和动物脂肪中提取的生物柴油,作为有前景的碳中性替代石油燃料的替代方法,但生物柴油/石油柴油与汽车燃料系统中的聚合物组分之间的相容性一直存在争议。在本研究中,已经研究了聚酰胺12(PA12)的降解,聚酰胺12(PA12)是在车辆燃料系统中使用的最常见的聚合物,在接触石油柴油,生物柴油及其混合物(占生物柴油20%(体积)/ 80)后,已进行了降解研究。 vol。%石油柴油)。燃料的吸附动力学,玻璃化转变温度数据和机械性能均表明,燃料使PA12增塑。另外,通过燃料从PA12中提取了单体和低聚物。长期暴露会导致氧化,并导致退火导致聚合物结晶度增加。将增塑,氧化和退火效果与拉伸机械性能相结合,以评估PA12材料的整体老化和降解程度。PA12在高温下表现出的燃料-聚合物相互作用和老化机理是“通用的”,因为它们也预期会与许多其他聚合物在不同程度上发生,它们表明在选择时应格外小心聚合物将在高温下暴露于燃料的应用中。

更新日期:2019-11-18
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