在回收低密度聚乙烯和线性低密度聚乙烯存在下，低密度聚乙烯/线性低密度聚乙烯共混物的结构、流变、热、机械和光学性能的相关性,Polymer Engineering and Science

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在回收低密度聚乙烯和线性低密度聚乙烯存在下，低密度聚乙烯/线性低密度聚乙烯共混物的结构、流变、热、机械和光学性能的相关性
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2024-01-10 , DOI: 10.1002/pen.26614
Romina Esmaeilzade ₁ , Kozodaev Alexey Stainslavovich _{2,

3} , Mohammad Hossein Jandaghian ₁ , Leila Sadat Rokni Hosseini ₁ , Luma Hussain Saleh ₄ , Simin Zarghampour ₅

Affiliation

工业后低密度和线性低密度聚乙烯吹塑薄膜经过机械回收，可在包装应用吹塑薄膜的生产中重新利用。该工艺能够生产成本更低、性能相似的薄膜，同时保护环境并减少废弃材料的处理量。机械回收过程产生回收颗粒。这个过程包括切碎、清洗、干燥和再加工。这些回收材料及其不同浓度的原始形式的混合物被成型为吹塑薄膜，低密度聚乙烯和线性低密度聚乙烯组分的固有负载量分别为 70 和 30 wt%。回收材料的傅里叶变换红外光谱结果显示没有污染或与其他材料发生化学反应。对原始和回收的低密度聚乙烯和线性低密度聚乙烯进行凝胶渗透色谱分析，结果表明回收过程中发生了链段和交联。从差示扫描量热法结果来看，样品热性能的下降表明存在交联。研究了回收过程引起的结构变化对流变性能的影响。共混组分的混溶性通过 Cole-Cole 图进行评估，然后通过 Han 和 Van Gurp-Palman 曲线进一步证明。随着交联的存在，机械性能显示出好转。薄膜本体和表面上的交联结构对光的折射导致薄膜光学性能的下降是显而易见的。

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Correlation of structure, rheological, thermal, mechanical, and optical properties in Low Density Polyethylene/Linear Low Density Polyethylene blends in the presence of recycled Low Density Polyethylene and Linear Low Density Polyethylene

Post-industrial low-density and linear low-density polyethylene blown films are mechanically recycled for reutilizing in the production of blown films for packaging applications. This process enables the production of films with lower cost and similar properties while preserving the environment and lowering the amount of waste material disposed of. The mechanical recycling process results in the production of recycled pellets. This process includes chopping, washing, drying, and reprocessing. Mixtures of these recycled materials and their virgin form with various concentrations are shaped into blown films with inherent 70 and 30 wt% loadings for low-density polyethylene and linear low-density polyethylene components, respectively. Fourier transform infrared spectroscopy results of the recycled material show no contamination or chemical reaction with other materials. Gel permeation chromatography is carried out on the virgin and recycled low-density polyethylene and linear low-density polyethylene, and the results indicate the occurrence of chain session and crosslinking during the recycling process. The decline in the thermal properties of the samples, seen from the differential scanning calorimetry results, indicates the presence of crosslinks. The effect of structural changes caused by the recycling process on the rheological properties is studied. The miscibility of the blend components is evaluated by Cole–Cole plots and then further proved by Han and Van Gurp–Palman curves. Mechanical properties display an upturn following the presence of the crosslinkes. A decline in the optical properties in the films caused by the refraction of light by the crosslink structure in the film bulk and on the surface is evident.

更新日期：2024-01-10

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