Microcellular foam of polymer blends of HDPE/PP and their composites with wood fiber

Rachtanapun, Pornchai; Selke, Susan; Matuana, Laurent M.

doi:10.1002/app.12170

Cited by 122 publications

(163 citation statements)

References 16 publications

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“…Dilution of one polymer with a small amount of the other has been found to be preferable relative to near-equal-mass mixtures. Rachtanapun et al [187] have found that blending HDPE and PP leads to reduced crystallinity, which facilitates CO 2 foaming, whereas the addition of wood fiber to the same blend inhibits foaming because of reduced CO 2 solubility and increased CO 2 escape rate. However, in some systems, crystalline structures can assist foaming.…”

Section: Cells CM à3mentioning

confidence: 98%

Thermodynamics and Kinetic Processes of Polymer Blends and Block Copolymers in the Presence of Pressurized Carbon Dioxide

2008

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Environmentally‐responsible materials processing is becoming an important global consideration in a wide variety of technologies, especially those wherein volatile and/or residual organic solvents cannot be tolerated. In this context, polymer processing has benefited tremendously from advances achieved using high‐pressure CO2 as a viscosity modifier, plasticizing agent, foaming agent, and reaction medium. Pressurized CO2 is environmentally benign, inexpensive, sustainable, and versatile owing to its gas‐like viscosity and liquid‐like solubility, which can be tuned through judicious choice of temperature and pressure. The addition of high‐pressure CO2 to homopolymer blends and block copolymers can have a profound impact on polymer thermodynamics and kinetic processes since the number of interacting species increases. As a result, the compressibility as well as plasticization and intermolecular screening effects become non‐negligible. In this work, we review how these factors influence such polymeric systems, and discuss commercial polymer processes and applications that benefit from the use of high‐pressure CO2.

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Section: Cells CM à3mentioning

confidence: 98%

Thermodynamics and Kinetic Processes of Polymer Blends and Block Copolymers in the Presence of Pressurized Carbon Dioxide

2008

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“…It was shown by Pilla et al [2] that the simultaneous addition of talc and CE leads to increased cell density and more uniform cell structure. Fillers, such as wood particles [8] or clay nanoparticles [9] are also known to act as crystal nucleating agents and change the melt viscosity. Moreover fillers influence the microstructure and thus the mechanical and thermal properties of the foams [10].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of natural fibre reinforced PLA foams prepared by supercritical CO2 assisted extrusion

Bocz¹,

Tábi²,

Vadas³

et al. 2016

Express Polym. Lett.

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Abstract. Natural fibre reinforced polylactic acid (PLA) foams, as potential green replacements for petroleum-based polymer foams, were investigated. Highly porous (ε > 95%) microcellular PLA foams were manufactured by supercritical CO 2 assisted extrusion process. To overcome the inherently low melt strength of PLA, epoxy-functionalized chain extender was applied, while talc was added to improve its crystallization kinetics. The combined application of chain extender and talc effectively promoted the formation of uniform cell structures. The effect of cellulose and basalt fibre reinforcement on the foamability, morphology, structure and mechanical properties of the PLA foams were investigated as well. The addition of 5 wt% natural fibres promoted the cell nucleation, but caused non-uniform distribution of cell size due to the microholes induced by local fibre-matrix debonding. The compression strength of the manufactured basalt fibre reinforced PLA foams reached 40 kPa.

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“…[3,5,13,15]. As is the case with physical blowing agents, chemical blowing agents produce gas that is dissolved in the polymer [9,12]. The gas release reaction can be endothermic or exothermic [7,9,15,18].…”

Section: Introductionmentioning

confidence: 99%

“…As is the case with physical blowing agents, chemical blowing agents produce gas that is dissolved in the polymer [9,12]. The gas release reaction can be endothermic or exothermic [7,9,15,18]. When using chemical blowing agents, one should take into account the fact that their decomposition temperature must be exceeded in order to produce the required amount of gas.…”

Section: Introductionmentioning

confidence: 99%

“…They do not determine, however, if the blowing agents have any impact on the effectiveness and efficiency of the extrusion process. Also, investigation of the extrusion process with regard to decomposition, number of cells, mechanical properties and structure of cellular extruded products made of HDPE/PP, PVC were conducted [9,12,18]. The studies about investigate the effectiveness of manufacturing cellular products are also significant [2,14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of Blowing Agents on the Effectiveness of Poly(vinyl Chloride) Extrusion

Garbacz

Jachowicz

Tor-Świątek

2016

Adv. Sci. Technol. Res. J.

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The cellular extrusion is a method for manufacturing profiles, bars, low density cellular coatings and other cellular products that have no hollow cavities on the surface and show minimal processing shrinkage, while their properties are similar to those of products produced by conventional extrusion. The paper deals with cellular extrusion of PVC. The investigation of the process was conducted using state-of-the-art endothermic and exothermic blowing agents that were dosed in up to 1.5% by weight. The experiments involved measuring output, energy consumption and energy efficiency of the process.

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Microcellular foam of polymer blends of HDPE/PP and their composites with wood fiber

Cited by 122 publications

References 16 publications

Thermodynamics and Kinetic Processes of Polymer Blends and Block Copolymers in the Presence of Pressurized Carbon Dioxide

Thermodynamics and Kinetic Processes of Polymer Blends and Block Copolymers in the Presence of Pressurized Carbon Dioxide

Characterisation of natural fibre reinforced PLA foams prepared by supercritical CO2 assisted extrusion

The Effect of Blowing Agents on the Effectiveness of Poly(vinyl Chloride) Extrusion

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