PDF(Pubmed)
Abstract：
The properties of recycled post-consumer rigid polyethylene packaging waste were studied, using sorted waste washed in the laboratory with water alone and with added detergent, and compared with large-scale high-intensity washed flakes. The washed flakes were compounded using three different temperature profiles in a twin-screw extruder and then injection molded. A higher compounding temperature reduced the thermo-oxidative stability, the average molecular mass, and the viscosity of the samples. Rheological measurements suggested that changes in chain branching occurred at different compounding temperatures. The strength and the elongation at break were also influenced by the compounding temperature in both the molten and solid states. Detergent washing maintained the thermo-oxidative stability in contrast to washing with water. The large-scale washed samples had a relatively high thermo-oxidative stability, a higher melt elasticity, and a lower elongation at break in both the molten and solid states than the laboratory-scale washed samples. The thermal properties, melt elasticity, Young\'s modulus, yield stress, and yield strain of the samples were not, however, significantly affected by either the compounding temperature or the washing medium and intensity. The results indicated that recycled post-consumer rigid polyethylene packaging waste has properties that can support further applications in new products.
摘要：
研究了回收的消费后硬质聚乙烯包装废物的性能，使用在实验室中单独用水和添加洗涤剂洗涤的分类废物，并与大型高强度洗涤片进行了比较。在双螺杆挤出机中使用三种不同的温度分布混合洗涤的薄片,然后注塑。较高的混合温度降低了热氧化稳定性，平均分子量,和样品的粘度。流变学测量表明，在不同的混合温度下发生了链支化的变化。强度和断裂伸长率也受熔融态和固态混合温度的影响。与用水洗涤相比,洗涤剂洗涤保持了热氧化稳定性。大规模洗涤的样品具有相对较高的热氧化稳定性，较高的熔体弹性，与实验室规模的洗涤样品相比，在熔融状态和固态下的断裂伸长率均较低。热特性，熔体弹性，杨氏模量,屈服应力，样品的屈服应变没有，然而,受复合温度或洗涤介质和强度的显著影响。结果表明，回收的消费后硬质聚乙烯包装废物具有可以支持新产品进一步应用的特性。
