Hybrid Chemomechanical Plastics Recycling: Solvent-free, High-Speed Reactive Extrusion of Low-Density Polyethylene.

被引:22
作者
Martey, Shawn [1 ]
Addison, Bennett [2 ]
Wilson, Nolan [2 ]
Tan, Bin [3 ]
Yu, Jianger [3 ]
Dorgan, John R. [3 ]
Sobkowicz, Margaret J. [1 ]
机构
[1] Univ Massachusetts, Dept Plast Engn, 1 Univ Ave, Lowell, MA 01854 USA
[2] Natl Renewable Energy Lab, Renewable Resources & Enabling Sci Ctr, Golden, CO 80401 USA
[3] Michigan State Univ, Dept Chem Engn & Mat Sci, 3815 Technol Blvd, Lansing, MI 48824 USA
关键词
heterogeneous catalysis; plastic recycling; polyethylene; twin-screw extrusion; zeolites; MECHANICAL DEGRADATION; CATALYTIC PYROLYSIS; ZSM-5; ZEOLITES; Y ZEOLITE; CRACKING; TEMPERATURE; RELAXATION; RHEOLOGY; BRANCHES; SPECTRA;
D O I
10.1002/cssc.202100968
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Low-density polyethylene (LDPE) is ubiquitous in the packaging industry owing to its flexibility, toughness, and low cost. However, it is typically contaminated with other materials, seriously limiting options for mechanical recycling. Interest in chemical recycling techniques such as pyrolysis and hydrothermal liquefaction is growing, but most of these processes face technoeconomic challenges that have limited commercial deployment. This study concerns a hybrid chemomechanical approach using reactive twin-screw extrusion (TSE) for tailoring the molecular weight and chain structure of reclaimed LDPE. Two types of zeolite catalysts at several loading levels are evaluated over a range of processing conditions. Structural, thermal, and rheological properties of the extruded samples are investigated and compared to virgin LDPE and LDPE extruded without the catalyst. NMR spectroscopy is used to investigate changes in the structure of the polymer. LDPE extruded with microporous Y zeolite shows lower degradation temperature and increased short chain branching. Mesoporous MCM-41 also induces increased branching but has no effect on the degradation temperature. The theoretical mechanical energy input for the chemical modification is calculated by using process modeling. The demonstrated hybrid reactive extrusion process provides a potential low-cost, simple approach for repurposing LDPE-based flexible packaging as coatings and adhesives.
引用
收藏
页码:4280 / 4290
页数:11
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