Fischer Joerg, Bradler Patrick R, Akhras Mohamad H, Wallner Gernot M, Lang Reinhold W
Johannes Kepler University Linz, Institute of Polymeric Materials and Testing, Altenberger Strasse 69, 4040 Linz, Austria.
Polymers (Basel). 2018 Jul 27;10(8):829. doi: 10.3390/polym10080829.
To assess the potential use of polyamide (PA) for solar-thermal systems applications, the effect of water with varying chlorine content on the fatigue crack growth (FCG) resistance of two PA formulations differing in their stabilizer packages was investigated at 80 °C. A commercial PA containing 30 wt % glass fibers and a standard stabilization package (PA-0) was used as the reference material. For the other formulation, the reference material PA-0 was compounded with two additional stabilizers (PA-S1). Keeping the specimen geometry and initial loading conditions the same, the total number of cycles to ultimate specimen failure was found to be reduced with an increase in chlorine content for both materials. As to the effect of the chlorine content on crack growth kinetics, the most pronounced effect in enhancing the crack growth rates or decreasing the FCG resistance was determined between 0 ppm and 1 ppm chlorine content. When comparing the relative change of FCG resistance in chlorinated water (10 ppm) to the FCG resistance in non-chlorinated water (0 ppm), the additional stabilization in the material PA-S1 appears beneficial over the stabilization in the reference material PA-0.
为评估聚酰胺（PA）在太阳能热系统应用中的潜在用途，研究了在80°C下，不同氯含量的水对两种稳定剂包不同的PA配方的抗疲劳裂纹扩展（FCG）性能的影响。一种含有30 wt%玻璃纤维和标准稳定剂包的商用PA（PA-0）用作参考材料。对于另一种配方，参考材料PA-0与另外两种稳定剂混合（PA-S1）。在保持试样几何形状和初始加载条件相同的情况下，发现两种材料的试样至最终破坏的总循环次数均随氯含量的增加而减少。至于氯含量对裂纹扩展动力学的影响，在氯含量为0 ppm至1 ppm之间，对提高裂纹扩展速率或降低抗FCG性能的影响最为显著。当比较氯化水中（10 ppm）的FCG阻力与非氯化水中（0 ppm）的FCG阻力的相对变化时，PA-S1材料中的额外稳定剂似乎比参考材料PA-0中的稳定剂更有益。
