Silane-modified carbon fibers reinforced cyanate ester/benzoxazine resin composites: Morphological, mechanical and thermal degradation properties

Zegaoui, Abdeldjalil; Derradji, Mehdi; Ma, Rui-kun; Cai, Wenfang; Medjahed, Aboubakr; Liu, Wenben; Dayo, Abdul Qadeer; Wang, Jun

doi:10.1016/j.vacuum.2018.01.025

Cited by 37 publications

(27 citation statements)

References 31 publications

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“…The enhancement seen in the thermal stabilities of the hybrid composites could be due to the excellent dispersion of the hybrid fibers within the resin matrix. Additionally, the high reaction interaction between the intra hydrogen bonding of the free hydroxyl groups of Poly(BA-a) with the silane treated hybrid fibers created more density and allowed the fibers to be used as thermal shielding, which made the evaporation of the macromolecules more difficult to attempt [33]. Furthermore, to explain the thermal enhancement of the hybrid composites, the thermal stability of CFs and KFs was also carried out by the TGA to obtain a clear indication about their roles in providing excellent thermal properties of the hybrid composites.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Hybrid Composites with Enhanced Mechanical and Thermal Properties Based on Polybenzoxazine and Chopped Kevlar/Carbon Hybrid Fibers

et al. 2018

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This work studied the structural, morphological, mechanical, and thermal properties of newly designed polymeric materials using high-performance hybrid fibers to reinforce the polybenzoxazine resins. To achieve this goal, hybrid fibers consisting of chopped Kevlar and carbon fibers were subjected to a silane surface treatment, incorporated into the resin matrix in various combinations, and then isothermally cured using the compression molding technique. The mechanical performances of the prepared composites were scrutinized in terms of bending and tensile tests. By way of illustration, the composites holding 20 wt % Kevlar fibers and 20 wt % carbon fibers accomplished a bending strength and modulus of 237.35 MPa and 7.80 GPa, respectively. Additionally, the same composites recorded a tensile stress and toughness of 77 MPa and 0.27 MPa, respectively, indicating an increase of about 234% and 32.8% when compared to the pristine resin’s properties. The thermogravimetric analysis denoted an excellent thermal resistance of the reinforced hybrid composites. Fourier transform infrared spectroscopy proved that the functional groups of the as-used coupling agent were effectively grafted on the external surfaces of the reinforcing systems, and further confirmed that the chemical reaction took place between the treated fibers and the polybenzoxazine matrix, although the scanning electron microscope showed a uniform dispersion and interfacial adhesion of the fibers within the resin matrix. In fact, the incorporation of treated fibers along with their good dispersion/adhesion could explain the progressive enhancement in terms of thermal and mechanical properties that were observed in the hybrid composites.

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Section: Resultsmentioning

confidence: 99%

Multifunctional Hybrid Composites with Enhanced Mechanical and Thermal Properties Based on Polybenzoxazine and Chopped Kevlar/Carbon Hybrid Fibers

et al. 2018

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“…More recently, rubber‐based materials and thermoplastics were introduced into CFs/PBZ composites in order to enhance the delamination toughness of composites . By incorporating polysulfone (PES) into the interlaminar region of CF/PBZ composites, Stanley and his group observed that H‐bonding interactions are established between PES particles and BZ resin ( Figure ) during polymerization contributing to the formation of a strong interphase which absorbed higher energy during the crack growth.…”

Section: Polybenzoxazine/carbon Materials Compositesmentioning

confidence: 99%

Developing Polybenzoxazine Composites Based on Various Carbon Structures

Bîru

Gârea

Iovu

2019

Macro Chemistry & Physics

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The synthesis of composite materials based on various carbon structures and polybenzoxazines (PBZs) gives products with noticeable thermal, electrical, and mechanical properties. The role of different carbon materials is emphasized in terms of the main advantages in both structure and properties. On the other hand, the PBZ features are significant considering the high glass transition temperatures, low flammability, high char yields, and good thermal stability. This review article describes the synthesis, structure, and properties of polybenzoxazine composites based on carbon fibers, carbon nanotubes, graphene, graphene oxide, and other carbonaceous materials. Particular attention is given to the interactions possible to occur between the polybenzoxazine matrix and carbon component.

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“…[38][39][40] Additionally, 7 day curing is enough for silane coupling agent to react with cement based on previous research studies. 41,42 Aer curing, extra amount of the modied tail sealant at the bottom of cement paste was cleaned up, while the composite specimen was cut in half lengthwise to examine whether there was any interfacial transition zone formed. As expected, there was an obvious cement-tail sealant interface as show in Fig.…”

Section: Cement-tail Sealant Interface Modied By Mptmsmentioning

confidence: 99%

A cement paste–tail sealant interface modified with a silane coupling agent for enhancing waterproofing performance in a concrete lining system

Yang

Tao

et al. 2019

RSC Adv.

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Although hydrophobic surface coating of concrete is currently used to enhance waterproofing performance of underground structures, the chemical and mechanical incompatibility between an inorganic cement and organic coating makes it a challenge to ensure long-term waterproofing properties of underground facilities, especially for tunnel lining systems. This study explores the feasibility of using a silane coupling agent to improve compatibility between the cement and tail sealant interface, which aims to reduce the water leakage risk of lining systems. The enhanced waterproofing performance of the cement-tail sealant interface modified with the silane agent was confirmed by its hydrophobicity (i.e. reduced wetting ability) and reduced permeability, which was evaluated by static water-contact angle and impermeability pressure measurements. The processes underlying the enhanced waterproofing performance of the cement-tail sealant interface were revealed by chemical bonding, microstructure and porosity characterization. Fourier transform infrared spectroscopy (FTIR) results of the cement-tail sealant interface confirm the reactions between the silane agent and cement hydration products, while both microstructure and porosity results reveal that the cement-tail sealant interface is denser and less porous, relative to the control cement grout.Conventional tail sealant was used as the base material in this study, which is composed of hydraulic uid, polyisobutylene, cotton ber and active calcium carbonate. Among these ingredients, hydraulic uid and polyisobutylene act as base oil and Fig. 1 (a) Schematic illustration of how a tail shield is applied on the surface of linings, (b) a sketch map of transverse section of a tunnel lining system and (c) a picture of a typical cross-section of a tunnel lining system. 7166 | RSC Adv., 2019, 9, 7165-7175 This journal is

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Silane-modified carbon fibers reinforced cyanate ester/benzoxazine resin composites: Morphological, mechanical and thermal degradation properties

Cited by 37 publications

References 31 publications

Multifunctional Hybrid Composites with Enhanced Mechanical and Thermal Properties Based on Polybenzoxazine and Chopped Kevlar/Carbon Hybrid Fibers

Multifunctional Hybrid Composites with Enhanced Mechanical and Thermal Properties Based on Polybenzoxazine and Chopped Kevlar/Carbon Hybrid Fibers

Developing Polybenzoxazine Composites Based on Various Carbon Structures

A cement paste–tail sealant interface modified with a silane coupling agent for enhancing waterproofing performance in a concrete lining system

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