Effect of Mold Temperature on the Impact Behavior and Morphology of Injection Molded Foams Based on Polypropylene Polyethylene–Octene Copolymer Blends

Muñoz-Pascual, Santiago; López-González, Eduardo; Saiz‐Arroyo, Cristina; Rodríguez‐Pérez, Miguel Ángel

doi:10.3390/polym11050894

Cited by 11 publications

(14 citation statements)

References 44 publications

(60 reference statements)

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“…Materials 2020, 13,2358 3 of 15 In this research, a 22% talc-filled PP was processed initially through conventional injection moulding (IM) then produced using variations of FIM process. For the PBA, super critical N2 was used (through the MuCell ® system) and the CBA used was TecoCell ® H1.…”

Section: Methodsmentioning

confidence: 99%

A Design of Experiment Approach for Surface Roughness Comparisons of Foam Injection-Moulding Methods

et al. 2020

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The pursuit of polymer parts produced through foam injection moulding (FIM) that have a comparable surface roughness to conventionally processed components are of major relevance to expand the application of FIM. Within this study, 22% talc-filled copolymer polypropylene (PP) parts were produced through FIM using both a physical and chemical blowing agent. A design of experiments (DoE) was performed whereby the processing parameters of mould temperatures, injection speeds, back-pressure, melt temperature and holding time were varied to determine their effect on surface roughness, Young’s modulus and tensile strength. The results showed that mechanical performance can be improved when processing with higher mould temperatures and longer holding times. Also, it was observed that when utilising chemical foaming agents (CBA) at low-pressure, surface roughness comparable to that obtained from conventionally processed components can be achieved. This research demonstrates the potential of FIM to expand to applications whereby weight saving can be achieved without introducing surface defects, which has previously been witnessed within FIM.

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Section: Methodsmentioning

confidence: 99%

A Design of Experiment Approach for Surface Roughness Comparisons of Foam Injection-Moulding Methods

et al. 2020

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“…Finally, a recent novel approach to the problem (using injection moulding with chemical blowing agent) is given by Gong et al [40] and Muñoz-Pascual [41]. Gong et al [39] obtained foamed PP/POE blends.…”

Section: Introductionmentioning

confidence: 99%

Foams with Enhanced Ductility and Impact Behavior Based on Polypropylene Composites

Muñoz-Pascual

Saiz‐Arroyo²,

Vuluga

et al. 2020

Polymers

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In this work, formulations based on composites of a linear polypropylene (L-PP), a long-chain branched polypropylene (LCB-PP), a polypropylene–graft–maleic anhydride (PP-MA), a styrene-ethylene-butylene-styrene copolymer (SEBS), glass fibers (GF), and halloysite nanotubes (HNT-QM) have been foamed by using the improved compression molding route (ICM), obtaining relative densities of about 0.62. The combination of the inclusion of elastomer and rigid phases with the use of the LCB-PP led to foams with a better cellular structure, an improved ductility, and considerable values of the elastic modulus. Consequently, the produced foams presented simultaneously an excellent impact performance and a high stiffness with respect to their corresponding solid counterparts.

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“…The elastomer morphology in foams is also conditioned, as it was proved in a previous study, 34 by the lower viscosity of the materials after including the gas phase, 45 and their higher thermal insulation capability. In the first case, the lower shear rate deformed less the droplets, showing lower deformation in the shear layer.…”

Section: Resultsmentioning

confidence: 84%

Effect of the elastomer viscosity on the morphology and impact behavior of injection molded foams based on blends of polypropylene and polyolefin elastomers

Muñoz-Pascual

Saiz‐Arroyo²,

Vananroye

et al. 2020

J of Applied Polymer Sci

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The impact resistance of injection‐molded polypropylene (PP) parts is severely reduced when they are foamed. It is necessary to implement strategies, such as elastomer toughening, to increase the impact behavior of foamed parts. However, the knowledge on the effect of elastomer addition on the morphology, cellular structure, and impact of injection‐molded cellular parts is very limited. In this work, foamed parts based on blends of PP and polyolefin elastomers have been produced and characterized. A high and a low viscosity octene‐ethylene copolymer (EOC) and a high viscosity butene‐ethylene copolymer (EBC) were employed. The blends have been thermally and rheological characterized. Solids materials and foams (relative density 0.76) were injection‐molded. The solid phase and cellular structure morphologies were studied using scanning electron microscopy. The results showed that elastomer toughening has been successful to obtain an improvement of the impact behavior in solid and cellular polymers. In this case, EOC materials provide an appropriate interfacial adhesion and optimized cellular structure which results in high impact resistance. The optimum elastomer to improve the properties is the EOC with a higher viscosity which provides impact resistance with n values below 3 due to the toughening of polymer matrix, thick skin thickness, and low cell size.

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Effect of Mold Temperature on the Impact Behavior and Morphology of Injection Molded Foams Based on Polypropylene Polyethylene–Octene Copolymer Blends

Cited by 11 publications

References 44 publications

A Design of Experiment Approach for Surface Roughness Comparisons of Foam Injection-Moulding Methods

A Design of Experiment Approach for Surface Roughness Comparisons of Foam Injection-Moulding Methods

Foams with Enhanced Ductility and Impact Behavior Based on Polypropylene Composites

Effect of the elastomer viscosity on the morphology and impact behavior of injection molded foams based on blends of polypropylene and polyolefin elastomers

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