Foams with Enhanced Ductility and Impact Behavior Based on Polypropylene Composites

Muñoz-Pascual, Santiago; Saiz‐Arroyo, Cristina; Vuluga, Zina; Corobea, Mihai Cosmin; Rodríguez‐Pérez, Miguel Ángel

doi:10.3390/polym12040943

Cited by 14 publications

(12 citation statements)

References 51 publications

(71 reference statements)

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“…When it is impacted by a strong external force, the dispersed EPDM particles act as a large number of stress concentration points, which can cause craze shear band in PP, and the craze branches around it, thus absorbing a lot of energy, At the same time, the stress field between a large number of crazes interferes with each other, which reduces the pressure at the craze end and hinders the craze expansion, so the toughness is significantly improved. [ 41,42 ] The existence of cell structure can also promote the impact strength. [ 9 ] The interaction of the two factors make the impact property of foamed PP increased by 55.7% from 15.60 to 24.29 MPa.…”

Section: Resultsmentioning

confidence: 99%

Preparation Process Orthogonal Optimization and Mechanical Properties of Microcellular Foam Polypropylene

Huang

Qin

et al. 2021

Macro Materials & Eng

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Melt strength, pressure and the amount of gas have significant effects on the foaming of polypropylene (PP). It is convenient to study the influence of these factors on foaming effect by orthogonal test. The experiment result shows that within the set factors and levels, the improvement of melt and the concentration of foaming masterbatch has the greatest influence on the cell size and density of foamed PP, respectively. When the concentration of azodicarbonamide (ADC) is 15 %, PP/ethylene‐propylene terpolymer (EPDM) = 90:10, and SiO2 content is 3%, the foaming effect is the best. At this time, the cell diameter decreases by 42.7%, cell density increases by more than 7.5 times compared with that without optimization. Material density decreases from 0.92 to 0.56 g cm−3. It is also found that good closed‐cell structure can improve the bending and impact properties of PP in varying degrees, especially the impact strength is 55.7% higher than that of neat PP. Finally, the promoting mechanism of cell structure on mechanical properties of materials is discussed, which is of great significance for the preparation of microfoamed PP materials and the deep research of its cell structure.

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Section: Resultsmentioning

confidence: 99%

Preparation Process Orthogonal Optimization and Mechanical Properties of Microcellular Foam Polypropylene

Huang

Qin

et al. 2021

Macro Materials & Eng

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“…Because of their brittle material characteristics, FC mixes have some disadvantages against the polymeric foam use. The high ductility properties of the polymeric foams make them advantageous in terms of the energy absorption capacity [20][21][22]. In some specific rock masses like those with swelling, squeezing or burst problems, the energy absorption capacity property is a quite important parameter for selection of support materials [23][24][25].…”

Section: Discussionmentioning

confidence: 99%

An Investigation of Foam Concrete Usability as a Cavity Filler Material in Mining

Komurlu

2021

GSE

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Strength and deformability properties of different cavity filler materials of a phenolic foam, a polyurethane based foam and a foam concrete (FC) mix were investigated and compared in this study. Instead of using polymeric foam fillers, FC usage was found to supply better load bearing capacity and modulus of elasticity values. The fresh FC mixes consisting of cement, water and foaming agents are able to be filled into the mine cavities. In the cavity filling applications, typical polymer foams cause support reactions with low stiffnesses and let the rock mass at the roof to be loosened. A relatively stiff cavity filling material can help rock masses to bear itself by prevention of the loosening. To avoid excessive deformations of the rock masses, the deformation modulus is an important parameter as well as the strength property. The FC filler materials were found advantageous because of economical supply of improved load bearing capacities and stiffness values for controlling the rock mass convergences.

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“…Polymeric foams are widely used in protective applications due to their high energy absorption capability [1][2][3], and the properties of a variety of open-cell and closed-cell foams have been widely studied under quasi-static compression [4][5][6], impact, and high strain rate loading conditions [7,8]. Foam materials and other materials can be combined into composite materials with excellent properties as needed [9][10][11]. For example, when polymer foam material is used as the core of sandwich composite [12][13][14], its impact resistance and energy absorption effect are significantly improved compared with similar materials [15,16].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

2021

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Foams are widely used in protective applications requiring high energy absorption under impact, and evaluating impact properties of foams is vital. Therefore, a novel test method based on a shock tube was developed to investigate the impact properties of closed-cell polyethylene (PE) foams at strain rates over 6000 s−1, and the test theory is presented. Based on the test method, the failure progress and final failure modes of PE foams are discussed. Moreover, energy absorption capabilities of PE foams were assessed under both quasi-static and high strain rate loading conditions. The results showed that the foam exhibited a nonuniform deformation along the specimen length under high strain rates. The energy absorption rate of PE foam increased with the increasing of strain rates. The specimen energy absorption varied linearly in the early stage and then increased rapidly, corresponding to a uniform compression process. However, in the shock wave deformation process, the energy absorption capacity of the foam maintained a good stability and exhibited the best energy absorption state when the speed was higher than 26 m/s. This stable energy absorption state disappeared until the speed was lower than 1.3 m/s. The loading speed exhibited an obvious influence on energy density.

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Foams with Enhanced Ductility and Impact Behavior Based on Polypropylene Composites

Cited by 14 publications

References 51 publications

Preparation Process Orthogonal Optimization and Mechanical Properties of Microcellular Foam Polypropylene

Preparation Process Orthogonal Optimization and Mechanical Properties of Microcellular Foam Polypropylene

An Investigation of Foam Concrete Usability as a Cavity Filler Material in Mining

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

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