Development and Characterization of the Injection-Molded Polymer Composites Made from Bicomponent Fibers

Andrzejewski, Jacek; Szostak, Marek; Krasucki, Janusz; Barczewski, Mateusz; Sterzyński, Tomasz

doi:10.1080/03602559.2014.935414

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…It can be seen that compared with the non‐reinforced ePP, a 4‐fold increase of the tensile strength and a 7‐fold increase of the tensile modulus were achieved by preparing short‐fibre reinforced SR‐PPCs. The achieved noticeable improvement of the tensile properties is significantly better than achieved earlier by injection moulding technology using co‐extruded composite pellets or bicomponent PP fibres as raw materials . In our system, the homopolymer fibres did not aggregate and could maintain their mechanical performance during processing and thus serve as adequate reinforcement in the composite.…”

Section: Resultsmentioning

confidence: 99%

“…The achieved noticeable improvement of the tensile properties is significantly better than achieved earlier by injection moulding technology using co-extruded composite pellets or bicomponent PP fibres as raw materials. 7,8 In our system, the homopolymer fibres did not aggregate and could maintain their mechanical performance during processing and thus serve as adequate reinforcement in the composite.…”

Section: Mechanical Propertiesmentioning

confidence: 98%

“…In the case of polypropylene, the increasing ethylene copolymer content is also positively correlated to the increase of the impact strength . Sterzynski et al used co‐extruded composite pellets and bicomponent fibres as input materials for injection moulding of SRPCs, but to achieve homogeneous distribution of reinforcing fibres in the injection moulded products proved to be rather challenging, and due to undesired fibre aggregations the reinforcing efficacy remained moderate in both cases. Kmetty et al proposed to use pre‐impregnated pellets, prepared by film‐stacking of high tenacity polymer fibres and copolymer matrix, serving as adequate starting material for injection moulding of SRPCs with homogeneous fibre distribution and improved mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

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Flame retarded self‐reinforced polypropylene composites prepared by injection moulding

Vadas

Kmetty

Bárány

et al. 2017

Polymers for Advanced Techs

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A method was elaborated to prepare flame retarded self-reinforced polypropylene composites by injection moulding. The effect of intumescent flame retardant (FR) loading was comprehensively investigated on the morphology, flammability, and mechanical properties of the self-reinforced polypropylene composites and compared with non-reinforced counterparts of identical additive contents. Homogeneous distribution of both the reinforcing polypropylene fibres and the FR additive was achieved endowing significantly improved strength and stiffness accompanied with increased fire resistance. At 10% FR content, 37% reduction of peak of heat release rate, UL94 V-2 rating, and LOI of 24.5 vol% were achieved without compromising the improved mechanical performance of the injection moulded self-reinforced composites, ie, a 4-fold increase of tensile strength and a 7-fold increase of tensile modulus were reached compared with the non-reinforced counterpart. At higher loading (15% FR), the FR properties improved further (LOI of 29.5 vol% was reached); however, due to the abrasive effect of the FR particles in the matrix, the structure of the reinforcing fibres tends to get damaged during the thermo-mechanical processing, and thus their reinforcing efficacy deteriorated. It is demonstrated that the combination of polymer fibre reinforcement with other fillers (such as FRs) is advantageous and feasible even by injection moulding, but the balance between the individual attributed properties needs to be found. This concept provides advantages in terms of interfacial properties, mechanical performance to weight ratio, recyclability, and environmental impact; 1 therefore, SRPCs gain increasing interest in both academia and industries.Nowadays, SRPCs are mainly produced by 3 processing methods:hot compaction, consolidation of coextruded tapes, and film stacking. 2 All of these methods yield in sheet-like (pre) products; these ways 3-dimensional parts with complex geometry cannot be directly produced. Therefore, increasing attempts are being made to produceSRPCs by the more versatile injection moulding method. Polymer fibres with highly aligned molecular or supramolecular structure, 3 generally created during spinning or drawing, can serve as suitable reinforcements in the structurally similar polymer matrix. One of the greatest challenges in using thermoplastic fibres to reinforce thermoplastic matrices is in their combination into a well-consolidated composite, which, normally achieved by thermal means, is complicated by the narrow window between the melting temperature of the matrix and that of the reinforcing fibres. 4 One possible way to disturb the regularity of the macromolecular chain and thus lower the crystalline melting temperature is copolymerization. Using a block or graft copolymer as matrix giving constituent fairly wide processing window can be ensured for SRPC preparation, wide enough even for injection moulding technology. 5 In the case of polypropylene, the increasing ethylene copolymer content is also positively corr...

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Section: Resultsmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flame retarded self‐reinforced polypropylene composites prepared by injection moulding

Vadas

Kmetty

Bárány

et al. 2017

Polymers for Advanced Techs

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“…This detector is largely used in material which composition has many elements [11] . Previous studies including SEM analysis of bicomponent fibers focused only in physical structure of the material [1][2][3] .…”

Section: Morphology and Elemental Identification Of Fibers By Sem/edsmentioning

confidence: 99%

“…Andrzejewski, et al [3] studied a new concept of bicomponent fibers as a base material for self-reinforced composite. The objective of this study was to explore the different thermal properties performed by bicomponent fibers when they are processed by different techniques, such as extrusion and injection molding.…”

Section: Introductionmentioning

confidence: 99%

Sheath-core bicomponent fiber characterization by FT-IR and other analytical methodologies

et al. 2018

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The bicomponent fibers are a special class of fibers that consolidate two polymers in only one fiber in order to explore individual properties of each polymer and can be designed in a spatial configuration that allows the enhancement in application of this material. Thereby, an appropriate characterization of bicomponent fibers is very valuable to process monitoring, quality control and forensic investigation. The sheath-core bicomponent fiber composed by polyethylene (PE), polypropylene (PP) and titanium dioxide (TiO 2) was analyzed by Fourier transform infrared (FT-IR) spectroscopy and other analytical methodologies. Results obtained by FT-IR using modern accessories showed efficiency to characterize the polymers of sheath (PE) and core (PP), moreover these polymers were confirmed by DSC (Differential Scanning Calorimetry). The morphology and elemental composition were also studied by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS). The thermogravimetric analysis (TGA) and colorimetric analysis allowed characterize and quantify the concentration of TiO 2 .

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Polypropylene composites obtained from self‐reinforced hybrid fiber system

Andrzejewski

Tutak

Szostak

2015

J of Applied Polymer Sci

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The purpose of the study was to obtain a composite material with the self-reinforced structure, which processing provide increased mechanical properties. The composites used in presented work were prepared from the two types of fiber mixtures, both were based on polypropylene fibers, the difference was in used cellulose or wood flour filler. Composites were prepared using the hot compaction method. The presented research describes the effect of the composite composition and processing conditions. The results include the static tension measurements, tensile impact tests and thermal analysis, including: DSC and DMTA. The structure has been studies using the SEM observations. Results of presented studies confirm the self-reinforcing effect in obtained hybrid composites. It provides in the comparison to the standard wood polymer composites to the higher level of material reinforcement with lower amount of natural filler.

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Development and Characterization of the Injection-Molded Polymer Composites Made from Bicomponent Fibers

Cited by 7 publications

References 23 publications

Flame retarded self‐reinforced polypropylene composites prepared by injection moulding

Flame retarded self‐reinforced polypropylene composites prepared by injection moulding

Sheath-core bicomponent fiber characterization by FT-IR and other analytical methodologies

Polypropylene composites obtained from self‐reinforced hybrid fiber system

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