Sibele P. Cestari, Rafael V. dos Santos, Daniela F. S. Freitas, Rafael H. Cestari, Marcos L. Dias, Luis C. Mendes
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In the pursuit of more sustainable practices within the circular economy, the estimation of polymer contents in mixed plastic blends is essential. This study presents a simple method for determining the polypropylene (PP) and polyethylene (PE) content in heterogeneous mixtures of recycled plastic. A calibration curve was developed using differential scanning calorimetry data, allowing for rough estimations of PP and PE ratios. Seven recycled PE/PP blends were analyzed, and cross-contamination of polymers was observed. Linear and quadratic fits of the enthalpy of fusion and degree of crystallinity were applied to estimate polymer contents. The quadratic fit of the degree of crystallinity provided the most accurate estimation, with standard deviations of 1.4% for PE and 3.7% for PP. This method offers a simple and accessible tool for small-scale recyclers to improve the efficiency of plastic recycling, filling a gap left by more complex scientific studies on polyolefins.
期刊介绍：
Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology.
As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology.
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