Shear and extensional rheology of polyethylenes recycled using a solvent dissolution process

IF 2.3 3区工程技术 Q2 MECHANICS

Rheologica Acta Pub Date : 2024-04-11 DOI:10.1007/s00397-024-01446-y

Guinevere Tillinghast, Kevin L. Sánchez-Rivera, George W. Huber, H. Henning Winter, Jonathan P. Rothstein

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Abstract

There is high market demand for increasing the viability of current plastic recycling processes. In this work rheology is used to evaluate the mechanical properties of a solvent dissolution recycled polymer compared to its virgin untreated precursor. Solvent dissolution and precipitation are used to target multi-layer, multi-component, industry films, which cannot be mechanically recycled. Polyethylene was chosen as the primary polymer of interest. Polymer thermal stability was monitored via time-resolved rheology; consecutive frequency sweeps over the course of an hour while under isothermal conditions. Additional rheological experiments were performed within the identified thermally stable conditions. Small-angle oscillatory shear was complemented with steady shear viscosity experiments over a wide range of shear rates. Extensional rheology was used to determine changes in molecular weight and cross link density. Rheological characterization is supplemented with gas chromatography–mass spectrometry of the solvent wash to determine components stripped from the virgin polymers during solvent treatment.

Graphical abstract

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利用溶剂溶解工艺回收聚乙烯的剪切和拉伸流变学特性

市场对提高当前塑料回收工艺可行性的需求很高。在这项研究中，流变学被用来评估溶剂溶解回收聚合物与其未经处理的原生前体相比的机械性能。溶剂溶解和沉淀用于针对多层、多组分的工业薄膜，这些薄膜无法进行机械回收。聚乙烯被选为主要的相关聚合物。聚合物的热稳定性通过时间分辨流变学进行监测；在等温条件下，在一小时内连续扫描频率。在确定的热稳定条件下还进行了其他流变实验。除了小角度振荡剪切实验外，还在很大的剪切速率范围内进行了稳定剪切粘度实验。延伸流变学用于确定分子量和交联密度的变化。流变学表征还辅以溶剂洗液的气相色谱-质谱分析，以确定在溶剂处理过程中从原始聚合物中剥离的成分。

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."