Composites

Zhang, Guigen; Lu, Helen H.; Mamidwar, Sachin; Wang, Min

doi:10.1016/b978-0-12-816137-1.00029-5

Cited by 8 publications

(10 citation statements)

References 14 publications

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“…For example, in a study by Wang et al, a 40 wt % boron nitride nanosheet incorporation into a polymer matrix resulted in up to ∼50% tensile strength reduction, likely due to the accumulation of the h-BN sheets within the composites. The contacting points in these agglomerations can either act as crack initiation sites or enhance crack propagation, leading to premature failure of the composites during mechanical loading. Therefore, appropriate surface treatment of h-BN to ensure better wettability in the PEEK matrix can improve the tensile strength of the composites .…”

Section: Resultsmentioning

confidence: 99%

Design of Highly Thermally Conductive Hexagonal Boron Nitride-Reinforced PEEK Composites with Tailored Heat Conduction Through-Plane and Rheological Behaviors by a Scalable Extrusion

Gul

Arican²,

Cansever³

et al. 2022

ACS Appl. Polym. Mater.

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The challenge of developing highly thermally conductive polymeric composites to meet the growing thermal management demands has recently attracted a lot of attention. To achieve a through-plane thermal conductivity higher than 2 W/mK, a high filler concentration within the poly(ether ether ketone) (PEEK) matrix is required, thus adding to the complexity of polymer processing. In this study, an optimized twin-screw extrusion melt-compounding technique was developed by tuning the melt flow of unfilled PEEK, feeding zones, and process cycles for dispersion of hexagonal boron nitride (h-BN) in the PEEK polymer. The prepared composites demonstrated exceptionally high in-plane and through-plane thermal conductivity of 12.451 and 2.337 W/mK, respectively, at 60 wt % h-BN loading. This improvement of thermal conduction in both directions can be attributed to two factors: (1) formation of through-thickness surface contacts between h-BN particles due to shear-driven exfoliation during compounding stage and (2) high degree of alignment of h-BN platelets achieved during molding stage. The calorimetric and thermogravimetric analyses indicated that the prepared composites possess enhanced crystallinity compared to unfilled PEEK and are thermally stable in elevated temperature ranges. The rheological characterization exhibited a progressive increase in viscosity and shear-thinning behavior of composite melts proportional to the h-BN concentration. Using the temperature and time-dependent rheological results, viscosity buildup profiles were constructed to outline allowable melt viscosity ranges for each composite composition. These profiles can be utilized to tailor the residence time of a composite melt by varying the filler concentration and process temperature during advanced manufacturing processes such as extrusion-based additive manufacturing and powder bed fusion. Hence, we provide a facile and industrially scalable method for development of h-BN-filled PEEK composites with high thermal dissipation characteristics aimed for thermal management in various harsh environment applications.

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Section: Resultsmentioning

confidence: 99%

Design of Highly Thermally Conductive Hexagonal Boron Nitride-Reinforced PEEK Composites with Tailored Heat Conduction Through-Plane and Rheological Behaviors by a Scalable Extrusion

Gul

Arican²,

Cansever³

et al. 2022

ACS Appl. Polym. Mater.

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“…Thermoplastic laminates (TLs) are composite materials made by stacking layers of fibers and thermoplastic polymer and compacting them to get the desired thickness and strength. 1,2 Compared to other lightweight structural materials, TLs are receiving a great deal of interest in different industrial sectors due to high specific stiffness and strength, excellent fatigue resistance, and good corrosion resistance. 3,4 They also offer numerous advantages over their thermoset counterparts because of their toughness and practically unlimited shelf-life of the raw materials.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of bio-polyamide 11/basalt thermoplastic laminates by hot compaction: The key-role of matrix rheology

Vitiello

Papa

Lopresto

et al. 2022

Journal of Thermoplastic Composite Materials

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The rheology of the polymer matrix plays a crucial role in determining the quality of thermoplastic laminates. To highlight this aspect, we prepared laminates based on polyamide 11 (PA11), a bio-based matrix with tricky rheology, and basalt fiber fabrics. The PA11 viscosity rapidly increases over time due to degradation phenomena. Samples were prepared by two procedures differing in terms of duration and intensity of the hot compaction step. Morphological analyses revealed that the fast procedure ensures a better impregnation of the fabrics, with a substantial reduction of the volume of voids (1%, against 9% of the slow procedure). This reflects in considerable increases of the flexural modulus (ca. + 20%) and strength (ca. + 60%) and a significant reduction the extent of impact damage. This study provides useful guidelines for a correct selection of the processing parameters based on the knowledge of the rheological behavior of the polymer matrix.

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“…In addition, it is inadequate for particulate reinforcement to form aggregates, as this will provide crack initiation sites or act to enhance crack propagation, causing premature failure of the composites under mechanical stresses [17]. Therefore, it is ideal that particles in composites are in a well-dispersed state.…”

Section: Introductionmentioning

confidence: 99%

Tensile and flexural properties of polyester composites reinforced by iron filings

Ogundiji¹,

Oyatogun²

2022

tribomat

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The effects of iron filings on the tensile and flexural properties of unsaturated polyester reinforced by iron filings have been studied. Particulate polyester composite reinforced by iron filings of different wt. % were synthesised and characterised. The mass percentage of the iron filings, varied from 0, 5, 10, 15, 20, 25 to 30 % were added to unsaturated polyester resin with 2 grams of methyl ethyl ketone peroxide catalyst and 0.5 grams of cobalt naphthalene accelerator to synthesise the composites. Tensile and flexural tests were carried out on the samples. The metallographic study was carried out using an optical microscope and scanning electron microscope. Results showed that tensile properties, including energy absorbed at fracture, percentage elongation, and tensile strength of the composite improved with increasing wt. % of filing particles up to 15 wt. %. This trend was also observed in the flexural strength results. The sample with 15 wt. % iron filings was observed to have the optimum reinforcement effect with a tensile strength of 34.91 MPa, a flexural strength of 111.06 MPa, and a modulus of elasticity of 1581.29 MPa.

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Composites

Cited by 8 publications

References 14 publications

Design of Highly Thermally Conductive Hexagonal Boron Nitride-Reinforced PEEK Composites with Tailored Heat Conduction Through-Plane and Rheological Behaviors by a Scalable Extrusion

Design of Highly Thermally Conductive Hexagonal Boron Nitride-Reinforced PEEK Composites with Tailored Heat Conduction Through-Plane and Rheological Behaviors by a Scalable Extrusion

Manufacturing of bio-polyamide 11/basalt thermoplastic laminates by hot compaction: The key-role of matrix rheology

Tensile and flexural properties of polyester composites reinforced by iron filings

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