Self-reinforced composites based on commercial PP woven fabrics and a random PP copolymer modified with quartz

Lucchetta, Maria Clarisbel; Arias, Juan Pablo Morales; Mollo, M.; Bernal, Celina Raquel

doi:10.1002/pat.3772

Cited by 8 publications

(12 citation statements)

References 29 publications

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“…was also used as reinforcement. In this fabric, a range of melting temperature between 173 °C and 178 °C was observed This result indicated that this fabric presented zones with different melting temperatures, as a result of the different stretching levels obtained during processing.…”

Section: Methodsmentioning

confidence: 71%

“…The results of the mechanical characterization of the woven PP fabric have been previously reported in another investigation . They are also included in this work only for comparison: maximum longitudinal and transversal stress values were 153.4 MPa and 117.4 MPa, respectively.…”

Section: Resultsmentioning

confidence: 96%

“…To characterize the non‐woven fabric under uniaxial tension, rectangular coupons having 15 mm in width, 165 mm in length, and 0.4 mm in thickness were also tested under uniaxial tension at 50 mm/min. The woven fabric had been previously characterized in another investigation …”

Section: Methodsmentioning

confidence: 99%

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Self‐reinforced polypropylene composites based on low‐cost commercial woven and non‐woven fabrics

Mijares

Agaliotis

Bernal

et al. 2017

Polymers for Advanced Techs

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In the present paper, different self‐reinforced polypropylene (PP) composites based on low‐cost commercial woven (w) and non‐woven (nw) fabrics were obtained. Hot compaction (HC) and film stacking (FS) followed by compression molding were used to prepared the composites. The fracture and failure behavior of the different materials was determined under different testing conditions through quasi‐static uniaxial tensile tests, Izod impact experiments and by means of fracture mechanics tests on mode I double‐edge deeply notched tensile specimens. In the case of the composite obtained by film stacking + compression molding (rPP/nw/w‐FS) and the hot‐compacted composite (nw/w‐HC) containing simultaneously woven and non‐woven fabrics, the acoustic emission technique was applied in situ in the tensile tests to determine their consolidation quality and to identify the failure mechanisms responsible for their fracture behavior. It was observed that both composites exhibited relatively similar high consolidation quality. However, the hot‐compacted composite presented a more uniform distribution of failure mechanisms (debonding and fiber fracture) than the film‐stacked composite. The hot‐compacted composite containing both types of reinforcements exhibited the best combination of mechanical (tensile, impact, and fracture) properties. Therefore, this composite appeared as the most promising for structural applications among the different composites investigated.

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Section: Methodsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 96%

See 1 more Smart Citation

Self‐reinforced polypropylene composites based on low‐cost commercial woven and non‐woven fabrics

Mijares

Agaliotis

Bernal

et al. 2017

Polymers for Advanced Techs

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“…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 . Recently, researchers also drew attention to the advantages of using organic and inorganic fibres and fillers in SRPCs, but the feasibility of such hybrid composite preparation with the injection moulding technology was not yet studied.…”

Section: Introductionmentioning

confidence: 99%

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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“…Since the concept of SPCs was first proposed by Capiati and Porter, [ 4 ] a variety of methods for preparing SPCs have been developed, including film stacking, [ 8, 9 ] solution/powder impregnation, [ 10, 11 ] hot compaction, [ 12, 13 ] co‐extrusion, [ 14, 15 ] sintering, [ 16 ] extrusion‐calendering [ 17 ] and injection molding (i.e., injection molding using pre‐impregnated SPC pellets [ 18, 19 ] and injection molding on an insert [ 20, 21 ] ). All these approaches can be classified as physical forming methods.…”

Section: Introductionmentioning

confidence: 99%

Dissolution window in in situ polymerization preparation of polyamide single‐polymer composites

Song

Wang

Xie

et al. 2021

Polymer Engineering & Sci

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Single‐polymer composites (SPCs) are promising composite materials in which the reinforcement and matrix have the same chemical composition. In situ polymerization shows a broad application potential for producing SPCs due to its wide temperature window. However, the dissolution of fiber reinforcements in the liquid monomer destroys the oriented chain structure of the fibers and affects the properties of SPCs. In this study, the polymerization time was adjusted by varying the activator dosage. The influence of the dissolution of fibers on the properties and the structure of SPCs was investigated. The maximum tensile strength was achieved at the highest activator dosage. A longer duration was required for the polymerization due to the low‐activator dosage, which led to the destruction of the oriented chain structure and the formation of a large amount of oligomers on account of the dissolution. Eventually, SPCs showed a low strength and a high deformation at break. In order to realize a good reinforcing effect, a sufficiently large dissolution window must be created by reducing the polymerization time. This study enhanced our understanding of the structure–property relationships of SPCs and provided a way to improve their mechanical characteristics.

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Self-reinforced composites based on commercial PP woven fabrics and a random PP copolymer modified with quartz

Cited by 8 publications

References 29 publications

Self‐reinforced polypropylene composites based on low‐cost commercial woven and non‐woven fabrics

Self‐reinforced polypropylene composites based on low‐cost commercial woven and non‐woven fabrics

Flame retarded self‐reinforced polypropylene composites prepared by injection moulding

Dissolution window in in situ polymerization preparation of polyamide single‐polymer composites

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