Improving the rheology of linear low-density polyethylene (LLDPE) and processability of blown film extrusion using a new binary processing aid

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-06-13 DOI:10.1515/ipp-2022-4309

Sarah Ramezan-Nejad, S. Mohamadi, N. Sharifi-Sanjani

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Abstract

Abstract To improve the processability of LLDPE, a binary processing aid composed of polyethylene glycol (PEG) and hydrocalumite was designed. Hydrocalumite containing HPO32− was successfully synthesized with co-precipitation of calcium and aluminum hydroxide in the presence of phosphorous acid. Scanning Electron Microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, Thermogravimetric analyses (TGA) and Ion chromatography were utilized for the characterization of the synthesized hydrocalumite. SEM images showed the layered structure. Ion Chromatography demonstrated the molar ratio of Ca2+/Al3+ was 2:1.3 as an interlayer ion. The influence of PEG/hydrocalumite with the different ratios as a processing aid on the rheological properties of LLDPE was investigated by capillary rheometry. The results obtained showed that PEG/hydrocalumite processing aid with a ratio of 1:3 exhibited the best effect on the reduction of critical stress due to the best coverage of the extruder surface. The measurement of processing parameters in the blown film extruder revealed that hydrocalumite interacted with metallic oxides, created a slippery film layer on the die wall. This leads to a decrease in the die pressure and power consumption by 11% and 21%, respectively. SEM analysis confirmed a delay in Sharkskin instability at a higher shear rate.

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使用新型二元加工助剂改善线性低密度聚乙烯（LLDPE）的流变性和吹塑薄膜挤出的可加工性

摘要为了提高LLDPE的加工性能，设计了一种由聚乙二醇（PEG）和水铝石组成的二元加工助剂。在亚磷酸存在下，通过钙和氢氧化铝的共沉淀，成功地合成了含HPO32−的氢钙石。利用扫描电子显微镜（SEM）、傅立叶变换红外光谱（FTIR）、热重分析（TGA）和离子色谱法对合成的水铝石进行了表征。SEM图像显示了层状结构。离子色谱表明，Ca2+/Al3+的摩尔比为2:1.3。采用毛细管流变仪研究了不同配比的PEG/水铝石作为加工助剂对LLDPE流变性能的影响。结果表明，比例为1:3的PEG/水铝石加工助剂由于对挤出机表面的覆盖最好，对降低临界应力的效果最好。吹塑薄膜挤出机中工艺参数的测量表明，水铝石与金属氧化物相互作用，在模具壁上形成光滑的膜层。这导致模具压力和功耗分别降低11%和21%。SEM分析证实了在较高剪切速率下Sharkskin不稳定性的延迟。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.