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首页> 外文期刊>Journal of Applied Polymer Science >Upcycling of polypropylene with various concentrations of peroxydicarbonate and dilauroyl peroxide and two processing steps
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Upcycling of polypropylene with various concentrations of peroxydicarbonate and dilauroyl peroxide and two processing steps

机译：具有各种浓度的过氧钴和过氧化锑的聚丙烯升高和两种加工步骤

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摘要

The influence of two peroxides (peroxydicarbonate/dilauroyl peroxide) with various concentrations (10-200 mmol/kg PP) and their effective opportunity to introduce long chain branched (LCB) were investigated. The dependence of a single and double extrusion step and the changes of the properties were studied. Experiments were carried out in a single screw extruder at 180 degrees C for the first extrusion step (modification) and at 240 degrees C for the second extrusion step (processing simulation). Melt flow rate and dynamic rheological properties were studied at a measuring temperature of 230 degrees C. For the definitive determination of long chain branched polypropylene (LCB-PP) served the extensional rheology measurements. The mechanical properties were examined via tensile test and impact tensile test. Summarized, LCB (melt strength) could be observed via extensional rheology for all modified specimens and the mechanical properties were maintained or even improved for the modified samples. Particularly, samples containing dilauroyl peroxide display excellent mechanical properties in this study.
机译：研究了两种不同浓度（10-200 mmol/kg PP）的过氧化物（过氧二碳酸酯/过氧化苯甲酰）的影响及其引入长支链（LCB）的有效机会。研究了单次和双次挤压步骤的相关性以及性能的变化。实验在单螺杆挤出机中进行，第一个挤出步骤（改造）温度为180℃，第二个挤出步骤（加工模拟）温度为240℃。在230°C的测量温度下研究了熔体流动速率和动态流变特性。为了确定长链支化聚丙烯（LCB-PP）的性能，需要进行拉伸流变测量。通过拉伸试验和冲击拉伸试验对其力学性能进行了检测。综上所述，通过拉伸流变学可以观察到所有改性试样的LCB（熔体强度），并且改性试样的力学性能得以保持甚至改善。特别是，在本研究中，含有过氧化二月桂酰的样品显示出优异的机械性能。

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