Polyoxymethylene foam: From an investigation of key factors related to porous morphologies and microstructure to the optimization of foam properties

Mantaranon, Nantinee; Chirachanchai, Suwabun

doi:10.1016/j.polymer.2016.05.001

Cited by 29 publications

(11 citation statements)

References 42 publications

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“…Mantaranon et al [100] prepared polyoxymethylene (POM) foam based on using a blowing agent, i.e., azodicarbonamide (ADAC). Their results indicated that the ADCA initiates cyanic acid with CO 2 , and allows for monodispersed bubbles without significant degradation of POM.…”

Section: Research Progress Of Various Foaming Methodsmentioning

confidence: 99%

“…The fracture toughness of the polymer foams can be improved by the addition of toughening agents [140,141]. The toughening agents can be separated into addition-type (elastomers, inorganic nanoparticles) and reaction-type (polyvinyl alcohol, polyethylene glycol, and PU prepolymer) agents [100,142,143,144,145,146,147,148,149,150,151,152]. Wang et al [11] studied the fracture toughness of nanocellular PP/PTFE nanocomposite foams.…”

Section: Current Problems and Possible Solutionsmentioning

confidence: 99%

“…Mantaranon et al [100] studied the mechanical properties and impact strength of POM foams. Their results indicated that the impact strength of the foams increased from 3.7 to 9.4 kJ/m 2 with increasing ADCA content from 1 to 3 phr.…”

Section: Current Problems and Possible Solutionsmentioning

confidence: 99%

“…Cell size of polyoxymethylene (POM) foams as a function of blowing agent content, reproduced from [100] with permission, copyright Elsevier, 2016.…”

Section: Figurementioning

confidence: 99%

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Recent Trends of Foaming in Polymer Processing: A Review

et al. 2019

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Polymer foams have low density, good heat insulation, good sound insulation effects, high specific strength, and high corrosion resistance, and are widely used in civil and industrial applications. In this paper, the classification of polymer foams, principles of the foaming process, types of blowing agents, and raw materials of polymer foams are reviewed. The research progress of various foaming methods and the current problems and possible solutions are discussed in detail.

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Section: Research Progress Of Various Foaming Methodsmentioning

confidence: 99%

Section: Current Problems and Possible Solutionsmentioning

confidence: 99%

Section: Current Problems and Possible Solutionsmentioning

confidence: 99%

“…Cell size of polyoxymethylene (POM) foams as a function of blowing agent content, reproduced from [100] with permission, copyright Elsevier, 2016.…”

Section: Figurementioning

confidence: 99%

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Recent Trends of Foaming in Polymer Processing: A Review

et al. 2019

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“…The cell size and cell density observations showed that PLA/HNT/AC gave 259.9% of higher cell density and 74.1% of smaller cell size than that of PLA/HNT samples. This is attributed to the presence of azodicarbonamide during melt-mixing stage that it enhanced the dispersion of the nanoparticles in the matrix by decreasing the viscosity of the polymer [3,[12][13][14]. The better dispersed nanofiller supported cell formation.…”

Section: Resultsmentioning

confidence: 99%

Polylactide/Halloysite Nanocomposite Foams: Particle Dispersion and Mechanical Strength

Eryıldız

Altan

2019

Acta Phys. Pol. A

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Polylactide (PLA) foams have been used in biomedical applications such as scaffolding and tissue engineering due to its biocompatibility. However, its brittleness and low melt strength limit it wide range of applications. In this study, halloysite nanotube (HNT) was used in order to improve the properties of the PLA foams. PLA/HNT composites were compounded on twin screw extruder within constant concentration of HNT (0.5 wt%). In extruder processing, compounding was realized in two different ways. In the first one, PLA/HNT was melt-mixed by the addition of 1 wt% azodicarbonamide (AC) in order to enhance the dispersion of the nanoparticles in the matrix. In the second one, azodicarbonamide was not added into the extruder during compounding of PLA/HNT. After melt-mixing process, neat PLA and PLA/HNT pellets were subject to chemical foaming on a conventional injection molding machine and tensile test samples were obtained. Mechanical test and morphological investigations were made in order to observe the tensile properties and foam cell generation of PLA composites. It has been seen that HNT addition in 0.5 wt% increased the tensile strength and elongation of PLA/HNT about 50% and 70%, respectively. Morphological results showed that HNT could improve the cell formation of PLA foams by decreasing the cell pore size and cell density. The usage of AC in melt-mixing stage of the polymer composite induced a slight increment in the tensile properties of the material due to the dispersant and plasticizer effect of azodicarbonamide.

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Investigation of thermoplastic elastomer (TPE) foaming process using blowing agent by rheological and morphological methods

Kong

Lee

Kim

et al. 2018

J of Applied Polymer Sci

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The effects of a chemical blowing agent (CBA) or an encapsulated physical blowing agent (PBA) on morphological development in ethylene octene copolymer (EOC) matrix using dicumyl peroxide (DCP) as a curing agent were investigated by rheological, mechanical, and morphological methods. Temperature ramp tests were carried out to understand curing and foaming processes. Curing temperature (Tcure) was determined as the crossover temperature where storage modulus G′ coincided with loss modulus G′′ in the rheological point of view. For the CBA, Tcure increased with increasing CBA concentration, whereas for the PBA, Tcure decreased with increasing PBA concentration. Other critical temperatures T1st, T2nd by foaming process were determined using the axial normal force. With these critical temperatures (Tcure, T1st, T2nd), curing and foaming mechanisms can be estimated. Simultaneously, volume expansions of samples were observed with camera. Morphology and mechanical analysis were conducted on fully cured and foamed ECP (is defined as EOC with DCP) with blowing agent. ECP with the CBA exhibited an irregular open‐cell structure, whereas when produced using the PBA, it formed a regular closed‐cell structure. Specific tensile strength tended to increase with increasing PBA concentration but as blowing agent concentration increased elongation at break decreased. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47358.

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Polyoxymethylene foam: From an investigation of key factors related to porous morphologies and microstructure to the optimization of foam properties

Cited by 29 publications

References 42 publications

Recent Trends of Foaming in Polymer Processing: A Review

Recent Trends of Foaming in Polymer Processing: A Review

Polylactide/Halloysite Nanocomposite Foams: Particle Dispersion and Mechanical Strength

Investigation of thermoplastic elastomer (TPE) foaming process using blowing agent by rheological and morphological methods

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