Dawoud Michael, Taha Iman
Sustainable Materials in Polymer Engineering, Aalen University, Beethovenstraße 1, 73430 Aalen, Germany.
Polymers (Basel). 2024 Aug 14;16(16):2301. doi: 10.3390/polym16162301.
The effect of contamination of polypropylene (PP) with selected polymers is studied to simulate the effect of mis-sorting in recycling streams. Polystyrene (PS), polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile butadiene styrene (ABS), and polylactic acid (PLA) were compounded with PP at different concentrations varying between 3 and 10%. Infrared spectroscopy proved the absence of chemical bonds between the constituents. Generally, melt flowability, except for the PP/PLA blend, and crystallinity were only slightly affected by the incorporation of the contaminating polymers. Samples of the polymer blends were injection moulded and further tested for their tensile and impact properties. Critical behaviour was induced by the introduction of a weld line as a result of the application of multiple gating points during injection moulding. Results generally show the applicability of PP mixtures within the investigated range of contamination, without much sacrifice in mechanical performance. However, in the case of ABS and PLA, more care should be taken when designing complex parts with weld lines, due to reduced toughness.
研究了聚丙烯（PP）被选定聚合物污染的影响，以模拟回收流中分类错误的影响。将聚苯乙烯（PS）、聚对苯二甲酸乙二酯（PET）、聚碳酸酯（PC）、丙烯腈-丁二烯-苯乙烯共聚物（ABS）和聚乳酸（PLA）与PP以3%至10%的不同浓度进行共混。红外光谱证明各组分之间不存在化学键。一般来说，除了PP/PLA共混物外，熔体流动性和结晶度仅受到污染聚合物掺入的轻微影响。将聚合物共混物的样品注塑成型，并进一步测试其拉伸性能和冲击性能。由于注塑成型过程中使用了多个浇口点而引入了熔合线，从而引发了临界行为。结果总体表明，在所研究的污染范围内，PP混合物具有适用性，且机械性能不会有太大牺牲。然而，对于ABS和PLA，在设计带有熔合线的复杂部件时应更加小心，因为其韧性会降低。
