Enhanced flow behaviors of metallocene‐catalyzed linear low‐density polyethylene during ultrasound‐assisted extrusion

Wu, Hong; Bao, Wenting; Guo, Shaoyun

doi:10.1002/pen.21759

Cited by 8 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, some doubts have been expressed about the occurrence of the acoustic cavitation in non‐Newtonian viscoelastic systems as a primary mechanism underlying the effect of ultrasounds. For example, Chen and Lin,95 Chen et al,87,96 Kim and Lee,8 and Wu et al90 mentioned that the physical and chemical effects of the ultrasound on polymer melts could be explained in terms of vibration of molecular chains or segments rather than in terms of the acoustic cavitation. However, there is still a lack of a deep understanding of these possible mechanisms.…”

Section: Fundamental Mechanisms Underlying the Effects Of Ultrasound mentioning

confidence: 99%

An Overview of Progress and Current Challenges in Ultrasonic Treatment of Polymer Melts

Ávila‐Orta¹,

Espinoza-González²,

Martinez-Colunga³

et al. 2012

Adv Polym Technol

View full text Add to dashboard Cite

An overview of the current state of art of the ultrasonic treatment technology applied to polymer melts is presented. The research and technological advancements of the ultrasonic treatment as applied to development of polymeric materials are discussed. An analysis of the technological progress shows that the mechanism of the effects of ultrasound on polymer melts is not fully understood at present. Such lack in fully understanding the mechanism could limit the use of this versatile technology in future applications. Based on the critical analysis of the research progress to date, some key issues for a deeper understanding of the chemical and physical effects of ultrasound on polymer

show abstract

Section: Fundamental Mechanisms Underlying the Effects Of Ultrasound mentioning

confidence: 99%

An Overview of Progress and Current Challenges in Ultrasonic Treatment of Polymer Melts

Ávila‐Orta¹,

Espinoza-González²,

Martinez-Colunga³

et al. 2012

Adv Polym Technol

View full text Add to dashboard Cite

show abstract

“…This suggested that Q increased with ultrasound treatment under the same die pressure. Following Mooney's method, Wu et al . found that a 200‐W ultrasound treatment of metallocene‐catalyzed linear low density polyethylene (mLLDPE) melts increased the slip velocity at the capillary wall by 1.5‐fold.…”

Section: Resultsmentioning

confidence: 99%

Effects of ultrasonic vibration on the rheological behavior of high‐density polyethylene composites filled with flash aluminum flake pigments

Hong

Xiao

Zhang

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

The metallic effect of polymer composites was produced through the loading of flash aluminum flake pigments (FAFPs) into polymers. This production method could eliminate postprocessing techniques, such as spray coating, painting, or metallization. We used a self-improved, ultrasound-assisted capillary rheometer to explore the rheological behavior of high-density polyethylene composites filled with FAFPs in the absence and presence of ultrasound treatment. The effects of the ultrasound intensity, experimental temperature, filler content, and particle size on the composite viscosity were studied. The results show that the composite viscosity not only decreased as the ultrasound intensity, experimental temperature, and particle size increased but also decreased as the filler content decreased. A viscosity model of the polymer melts was proposed to illustrate the relationship between the viscosity and ultrasonic intensity. The viscosity obeyed the equations under ultrasonic vibration. The predicted results for the composite viscosity complied greatly with the experimental values.

show abstract

“…In particular, they showed that an ultrasonically aided single screw extrusion improved processing of LLDPE by reducing the die pressure and melt viscosity. Also, suppression of the sharkskin phenomenon on LLDPE extrudates was achieved27 along with breakup of the dispersed phase of polyolefin elastomer (POE) in metallocene catalyzed LLDPE/POE blend 28. Ultrasonically aided extrusion also led to an improvement of the elongation at break of LDPE/LLDPE blends 29.…”

Section: Introductionmentioning

confidence: 96%

“…A few studies on the effect of ultrasound on pure LLDPE were reported 27–30. In particular, they showed that an ultrasonically aided single screw extrusion improved processing of LLDPE by reducing the die pressure and melt viscosity.…”

Section: Introductionmentioning

confidence: 99%

Online ultrasonic film casting of LLDPE and LLDPE/clay nanocomposites

Niknezhad

Isayev

2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

Transparent cast films of linear low density polyethylene (LLDPE) with nanoclay up to 10 wt % were prepared in one step process using an ultrasonically assisted compounding extruder operating at various ultrasonic amplitudes combined with film casting machine operating at various take up speeds. Thermal, rheological, morphological, and mechanical properties and gas permeability of these films were studied. Ultrasonic treatment introduced an increase in the complex viscosity and storage modulus and a reduction in the tangent loss of LLDPE/clay nanocomposite melts. Cast films prepared by ultrasonic treatment at an amplitude of 7.5 lm showed the highest mechanical properties in both the machine and transverse directions and the lowest oxygen permeability. X-ray diffraction patterns along with the SEM and TEM images revealed the presence of the exfoliated structure due to the ultrasonic treatment for cast films containing up to 7.5 wt % of clay loading. NMR studies of LLDPE cast films showed an increase of branching due to the ultrasound treatment.

show abstract

Enhanced flow behaviors of metallocene‐catalyzed linear low‐density polyethylene during ultrasound‐assisted extrusion

Cited by 8 publications

References 30 publications

An Overview of Progress and Current Challenges in Ultrasonic Treatment of Polymer Melts

An Overview of Progress and Current Challenges in Ultrasonic Treatment of Polymer Melts

Effects of ultrasonic vibration on the rheological behavior of high‐density polyethylene composites filled with flash aluminum flake pigments

Online ultrasonic film casting of LLDPE and LLDPE/clay nanocomposites

Contact Info

Product

Resources

About