Heat transfer in microcellular polystyrene/multi-walled carbon nanotube nanocomposite foams

Gong, Pengjian; Buahom, Piyapong; Tran, Minh-Phuong; Park, Chul; Pötschke, Petra

doi:10.1016/j.carbon.2015.06.003

Cited by 165 publications

(99 citation statements)

References 60 publications

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“…Owing to the weak melt strength of iPP, several approaches such as cross-linking, 34 branching, 28,32,35 blending, 23 and nanoparticle addition 22,24,33,36 have been investigated as ways to modify iPP to possess adequate melt strength and foaming processability. Cellulose nanober (CNF), 37 which is derived from abundant and renewable resources, has highly promising applications as a cell nucleating agent and a reinforcing agent for plastic foams.…”

Section: -30mentioning

confidence: 99%

Evolution of cellular morphologies and crystalline structures in high-expansion isotactic polypropylene/cellulose nanofiber nanocomposite foams

et al. 2018

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Herein, the development of cell morphology and crystalline microstructure of injection-molded isotactic polypropylene/cellulose nanofiber (PP/CNF) composite foams with 2-10-fold expansion ratios was investigated through scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS). Compared with isotactic polypropylene (iPP) foams, the added CNF improved the cell morphology and resulted in a great reduction in cell size. Additionally, the PP lamella orientation and crystal type were notably altered during the core-back FIM process. As the expansion ratio increased, the original isotropic lamellae in the iPP foams were transformed into an oriented lamellar structure and then further transformed into a typical shish-kebab structure, while hybrid shishkebab structures were simultaneously generated in the high-expansion PP/CNF nanocomposite foams. Accordingly, the highest content of b-crystals was observed in the low-expansion iPP foams. In contrast, the b-crystal content in PP/CNF composites decreased monotonously as the expansion ratio increased, which resulted from the combined effects of CNF's nucleating ability for a-crystals and the more dominant extensional flow effect assisted by the added CNF.

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Section: -30mentioning

confidence: 99%

Evolution of cellular morphologies and crystalline structures in high-expansion isotactic polypropylene/cellulose nanofiber nanocomposite foams

et al. 2018

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“…Recently, faced with global energy crisis and environmental pollution, both industries and academics have made efforts to manufacture new‐generation lightweight products by using less raw material and consuming less energy . Conventional foam injection molding (CFIM) technology is achieved by injecting the mixture of polymer melt and supercritical fluid (SCF) into a closed mold cavity with a short‐shot, and the expandable melt/gas mixture generates a foam structure under low pressure . However, it is known that the differences of shearing stress and temperature in both the direction of the flow and the direction perpendicular to the flow usually result in a nonuniform cell structure, which deteriorates the mechanical properties of the foamed products .…”

Section: Introductionmentioning

confidence: 99%

Polystyrene Foam with High Cell Density and Small Cell Size by Compression‐Injection Molding and Core Back Foaming Technique: Evolution of Cells in Cavity

Bai

Dong

Xiao

et al. 2018

Macro Materials & Eng

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Many efforts have been made to obtain uniform cell structures from foam injection molding techniques. However, cell nucleation mechanism and complex dynamics during the cell formation have rarely been well understood. Here, high‐pressure foam injection molding (HPFIM) is achieved by combining the injection–compression molding with core back foaming (ICMCBF) technique. The influences of compression pressure and time on the cell structure of polystyrene foam during the foaming process are studied. Compared with low pressure for conventional foam injection molding, high compression pressure (200 bar) and fast pressure drop rate of ICMCBF endow the foam with the highest cell density (1.59 × 107 cells cm−3), and the smallest cell size (15 µm). The tensile strength and impact strength are enhanced by about 60% (from 22.3 to 35.6 MPa) and 80% (from 3.6 to 6.8 MPa), respectively. This study gives a critical understanding of the cell nucleation and growth mechanism of the foam injection molding and supplies a new strategy for the fabrication of foam with uniform cell structure.

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“…illuminated that the cell morphology, cell density, and expansion ratio of linear PP were improved by addition of nanoclay. Gong et al . improved the heat transfer of polystyrene using microcellular foaming with multi‐walled carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous decision analysis on the structural and mechanical properties of polymeric microcellular nanocomposites foamed using CO₂

Daryadel

Azdast

Hasanzadeh

et al. 2017

J of Applied Polymer Sci

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In this study, the effects of nano Fe 2 O 3 content and foaming temperature and time are investigated on the various structural and mechanical properties of polypropylene in a batch foaming process with CO 2 using Taguchi approach. Cell size, relative density, and specific impact strength and hardness are considered as different criteria. The results indicated that the cell sizes are below 10 lm and a 20% improvement is observed in the microcellular nanocomposite samples containing 4 wt % nano Fe 2 O 3 . A 20% improvement is observed in specific impact strength by increasing 4 wt % of nano Fe 2 O 3 . Also, a simultaneous decision analysis is performed and the best sample with respect to considered structural and mechanical properties is selected using multi-criteria decision making methods. The results demonstrated that the microcellular nanocomposite foams containing 4 wt % of nano Fe 2 O 3 are the best samples.

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Heat transfer in microcellular polystyrene/multi-walled carbon nanotube nanocomposite foams

Cited by 165 publications

References 60 publications

Evolution of cellular morphologies and crystalline structures in high-expansion isotactic polypropylene/cellulose nanofiber nanocomposite foams

Evolution of cellular morphologies and crystalline structures in high-expansion isotactic polypropylene/cellulose nanofiber nanocomposite foams

Polystyrene Foam with High Cell Density and Small Cell Size by Compression‐Injection Molding and Core Back Foaming Technique: Evolution of Cells in Cavity

Simultaneous decision analysis on the structural and mechanical properties of polymeric microcellular nanocomposites foamed using CO₂

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Heat transfer in microcellular polystyrene/multi-walled carbon nanotube nanocomposite foams

Cited by 165 publications

References 60 publications

Evolution of cellular morphologies and crystalline structures in high-expansion isotactic polypropylene/cellulose nanofiber nanocomposite foams

Evolution of cellular morphologies and crystalline structures in high-expansion isotactic polypropylene/cellulose nanofiber nanocomposite foams

Polystyrene Foam with High Cell Density and Small Cell Size by Compression‐Injection Molding and Core Back Foaming Technique: Evolution of Cells in Cavity

Simultaneous decision analysis on the structural and mechanical properties of polymeric microcellular nanocomposites foamed using CO2

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Simultaneous decision analysis on the structural and mechanical properties of polymeric microcellular nanocomposites foamed using CO₂