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Effect of the processing conditions on the microstructure and properties of rotational molded polyamide 11

机译：加工条件对滚塑聚酰胺11微观组织和性能的影响

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摘要

Rotomolded containers for solvents and hydrocarbons require the use of high-permeability resins such as polyamide (PA). The published studies with this material are very scarce. In this work, a commercial grade of PA11 was rotational-molded using different processing temperatures and characterized with a range of techniques. The study aims at investigating the influence of the processing conditions on the microstructure and properties of molded parts. The results showed that the spherulitic morphology and the mechanical properties are affected by the processing temperature, the optimum processing range being between 220 degrees C and 240 degrees C. Overheating causes a decrease of the impact strength and a severe increase in the formation of pinholes at the outer surface due to polymer degradation and formation of volatile products. The thermo-oxidation reactions occurring at the inner surface of the samples result in the formation of products that absorb in the UV and visible light regions and cause the microhardness and the melt viscosity of the material to increase. The extent and severity of the degradation at the inner surface may be easily assessed by fluorescence microscopy. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 108:939-946,2008.
机译：用于溶剂和碳氢化合物的滚塑容器需要使用高渗透性的树脂，例如聚酰胺（PA）。用这种材料发表的研究非常匮乏。在这项工作中，使用不同的加工温度对商业级的PA11进行了旋转成型，并通过一系列技术对其进行了表征。该研究旨在调查加工条件对成型零件的微观结构和性能的影响。结果表明，加工温度对球晶的形貌和力学性能都有影响，最佳加工范围为220℃至240℃。过热会降低冲击强度，并严重增加针孔的形成。外表面由于聚合物降解而形成挥发性产物。发生在样品内表面的热氧化反应导致形成产品，这些产品在紫外线和可见光区域吸收，并导致材料的显微硬度和熔体粘度增加。内表面降解的程度和严重程度可以通过荧光显微镜容易地评估。 （c）2008 Wiley Periodicals，Inc. J Appl Polym Sci 108：939-946,2008。

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