Ageing properties and polymer/fuel interactions of polyamide 12 exposed to (bio)diesel at high temperature
Ageing properties and polymer/fuel interactions of polyamide 12 exposed to (bio)diesel at high temperature
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DOI：
10.1038/s41529-018-0065-y
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发表时间：
2019-01
影响因子：
5.1
通讯作者：
Xin Wei;Loris De Vico;P. Larroche;K. Kallio;Stefan Bruder;Martin Bellander;U. Gedde;M. Hedenqvist
中科院分区：
文献类型：
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作者：
Xin Wei;Loris De Vico;P. Larroche;K. Kallio;Stefan Bruder;Martin Bellander;U. Gedde;M. Hedenqvist
从油料作物和动物脂肪中提取的生物柴油已被开发成为运输部门石油燃料的一种有前途的碳中性替代品，但生物柴油/石油柴油与汽车燃料系统中聚合物成分之间的相容性一直存在争议。在本研究中，研究了汽车燃料系统中最常用的聚合物之一聚酰胺12（PA 12）在暴露于石油柴油、生物柴油及其混合物（20体积%）后的降解情况生物柴油/80 vol. %石油柴油）。燃料吸附动力学，玻璃化转变温度数据和机械性能都表明，燃料塑化的PA 12。此外，单体和低聚物被萃取从PA 12的燃料。长期暴露导致氧化和退火引起的聚合物结晶度增加。将增塑、氧化和退火效应与拉伸机械性能相结合，以评估PA 12材料的老化和降解的总体程度。在高温下对PA 12所证明的燃料-聚合物相互作用和老化机制是“通用的”，因为许多其他聚合物也会在不同程度上发生这种相互作用和老化机制，这表明在高温下暴露于燃料的应用中选择聚合物时应谨慎。
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.