Preparation and applications of linear low-density polyethylene

Abstract

Linear low-density polyethylene (LLDPE) is widely used in many fields like packaging and film due to its chemical resistance and high tensile strength. This review mainly introduces the preparations and applications of LLDPEs produced by Ziegler-Natta catalyst, metallocene-based catalyst, and late transition metal catalyst, respectively. The improved mechanical and conductivity properties of LLDPE by Ziegler-Natta catalysts, higher activity of the metallocene-based catalysts and high performance of LLDPE directly produced by late transition metal were highlighted. The enhancement of the resistance, flexibility, transparency properties, and yield is achieved using those catalysts and mild conditions. This also leads to more applications in electrical, medical, and surgical areas and can reach an industrial scale.

Polyethylene Blends for Improved Oxygen Barrier: Processing-Dependent Microstructure and Gas Permeability

“…Then, according to ASTM D3985, one side was maintained at 1 atm of nitrogen. Air (containing 20.9% oxygen) at 1 atm was maintained on the other side, and the amount of oxygen that passed through the sample film (in cm 3 STP /day) was measured using an oxygen sensor. This amount of oxygen was divided by the area of the film (in m 2 ) exposed to air and the partial pressure difference of the oxygen between the two compartments (0.209 atm) to yield the OTR in cm 3 STP /(m 2 •day•atm).…”

“…Air (containing 20.9% oxygen) at 1 atm was maintained on the other side, and the amount of oxygen that passed through the sample film (in cm 3 STP /day) was measured using an oxygen sensor. This amount of oxygen was divided by the area of the film (in m 2 ) exposed to air and the partial pressure difference of the oxygen between the two compartments (0.209 atm) to yield the OTR in cm 3 STP /(m 2 •day•atm). When following ASTM D1434, one side of the measurement cell was kept under vacuum while the other side held pure oxygen at 3−25 atm.…”

“…The amount of oxygen that passed through the film was measured using a vacuum gauge and was divided by the exposed area and the oxygen pressure to yield the ozone-containing concentration (OTR). Finally, the OTR obtained from either method was multiplied by the film thickness to obtain P Od 2 in cm 3 STP •mm/(m 2 •day•atm), which is the value intrinsic to the material and does not depend on the film thickness.…”

Coffee-ring formation through the use of the multi-ring mechanism guided by the self-assembly of magnetic nanoparticles

“…In this study, magnetic liquid droplets with this property are placed on the hydrophobic low-density polyethylene (LDPE) film. This non-polar material, due to its chemical resistance and flexibility is used mainly for packaging, and insulation, but recently it shows an increasing role in biomedical applications 24 . The results obtained in this work also fit perfectly into the new class of proposed green electronics materials 25 .…”

Programmable control over the coffee-ring formation through the use of the multi-ring mechanism guided by the self-assembly of magnetic nanoparticles

“…In this study, magnetic liquid droplets with this property are placed on the hydrophobic low-density polyethylene (LDPE) film. This non-polar material, due to its chemical resistance and flexibility is used mainly for packaging, and insulation, but recently it shows an increasing role in biomedical applications 23 . The results obtained in this work also fit perfectly into the new class of proposed green electronics materials 26 .…”