Functional interlayers with controlled adhesion developed for polymer composites

Pálesch, Erik; Knob, Antonin; Plichta, Tomas; Čech, Vladimír

doi:10.1016/j.tsf.2018.04.035

Cited by 15 publications

(20 citation statements)

References 21 publications

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“…The work of adhesion was used as the right parameter for the characterization of the interlayer adhesion measured by a nanoscratch test. A strong correlation was found between the IFSS in GF/polyester composites and the interlayer adhesion for the same plasma coating [38]. Model and experimental data showed that the shear strength at the interlayer/fiber interface is the key factor affecting the mechanical response of the plasma-coated fibers in a GF/polyester composite at microindentation testing.…”

Section: Selected Interlayers For Gf/polyester Compositementioning

confidence: 85%

“…The IFSS (blue square) ranged from 130 to 139 MPa at a fiber volume fraction of approximately 0.53 in the GF/polyester composite. The maximum IFSS at a 0.33 oxygen fraction corresponds to the highest adhesion of the interlayer on glass substrate characterized by the work of adhesion (red circle) [38]. A 3.4-fold increase in the adhesion of the a-CSiO:H film (0.33 oxygen fraction), due to a raised concentration of Si-O-C/Si-O-Si bonding species at the interlayer/glass interface, compared to the a-CSi:H film (zero oxygen fraction) was promising for using the adhesive film as a functional interlayer in the GF/polyester composite.…”

Section: Selected Interlayers For Gf/polyester Compositementioning

confidence: 99%

“…The IFSS trend corresponds to the adhesion trend (Figure 8a), but the statistical significance of the maximum IFSS is not entirely convincing. Although there are differences between the microindentation test and the nanoscratch test in the specimen loading and failure mechanics, and both the IFSS and the work of adhesion are calculated based on simplified assumptions, the interlayer adhesion on the glass surface was shown to control the shear strength in the GF/polyester composite [38]. The effect of GF pretreatment and post-treatment of plasma-coated GFs on IFSS is demonstrated for the same Interlayer A (type A: 0.33 oxygen fraction, 5.0 W) in Figure 8b.…”

Section: Selected Interlayers For Gf/polyester Compositementioning

confidence: 99%

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Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites

Knob¹,

Lukeš

Drzal

et al. 2018

Fibers

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Compatible interlayers must be coated on reinforcing fibers to ensure effective stress transfer from the polymer matrix to the fiber in high-performance polymer composites. The mechanical properties of the interlayer, and its interfacial adhesion on both interfaces with the fiber and polymer matrix are among the key parameters that control the performance of polymer composite through the interphase region. Plasma-synthesized interlayers, in the form of variable materials from polymer-like to glass-like films with a Young’s modulus of 10–52 GPa, were deposited on unsized glass fibers used as reinforcements in glass fiber/polyester composites. Modulus Mapping (dynamic nanoindentation testing) was successfully used to examine the mechanical properties across the interphase region on cross-sections of the model composite in order to distinguish the fiber, the interlayer, and the modified and bulk polymer matrix. The interfacial shear strength for plasma-coated fibers in glass fiber/polyester composites, determined from the microindentation test, was up to 36% higher than those of commercially sized fibers. The effects of fiber pretreatment, single and double interlayers, and post-treatment of the interlayer on interfacial shear strength were also discussed. Functional interlayers with high shear yield strength and controlled physicochemical properties are promising for high-performance polymer composites with a controlled interphase.

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Section: Selected Interlayers For Gf/polyester Compositementioning

confidence: 85%

Section: Selected Interlayers For Gf/polyester Compositementioning

confidence: 99%

Section: Selected Interlayers For Gf/polyester Compositementioning

confidence: 99%

See 1 more Smart Citation

Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites

Knob¹,

Lukeš

Drzal

et al. 2018

Fibers

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“…A deposition rate of 570 nm min −1 at the precursor input dropped to a minimum of 31 nm min −1 at a distance of 75 cm from the precursor input for 100 W. In the case of 2.0 W, the deposition rate only slightly varied between 16–49 nm min −1 along the tube. It has been found that plasma nanocoatings deposited from a mixture of a TVS precursor with oxygen gas at low power efficiently affect the interfacial properties of polymer composites [25], since the low power resulted in reduced network crosslinking, supported by increased oxygen fraction, which caused a decline of nanocoating mechanical properties favorable to reduce the shear stress across the composite interphase [16]. For this reason, pulsed plasma at 2.0 W and various oxygen fractions (0–0.71) in TVS/O2 mixture were tested for thin film deposition (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

Plasma Nanocoatings Developed to Control the Shear Strength of Polymer Composites

et al. 2019

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All reinforcements for polymer-matrix composites must be coated with a suitable material in the form of a thin film to improve compatibility and interfacial adhesion between the reinforcement and the polymer matrix. In this study, plasma nanotechnology was used to synthetize such functional nanocoatings using pure tetravinylsilane (TVS) and its mixtures with oxygen gas (O2) as precursors. The plasma-coated glass fibers (GFs) were unidirectionally embedded in a polyester resin to produce short composite beams that were analyzed by a short-beam-shear test to determine the shear strength characterizing the functionality of the nanocoatings in a GF/polyester composite. The developed plasma nanocoatings allowed controlling the shear strength between 26.2–44.1 MPa depending on deposition conditions, i.e., the radiofrequency (RF) power and the oxygen fraction in the TVS/O2 mixture. This range of shear strength appears to be sufficiently broad to be used in the design of composites.

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“…Incorporation of oxygen atoms into the plasma polymer network led to the formation of stronger chemical species in the backbone chain and side polar groups (hydroxyl, carbonyl) that reduced crosslinking of the plasma polymer network [6]. This chemical modification influenced not only the mechanical properties of plasma polymer films but also their adhesion to the silicon dioxide surfaces [8] and their surface free energy (wettability) [9].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of Oxidized Plasma-Polymerized Organosilicones and Their Correlation with Mechanical and Chemical Parameters

et al. 2019

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Pure tetravinylsilane and its oxygen mixture were used to deposit oxidized plasma polymer films at various effective power (0.1–10 W) and various oxygen fractions (0–0.71) using RF pulsed plasma. The optical properties (refractive index, extinction coefficient, band gap) of the deposited films were investigated by spectroscopic ellipsometry (230–830 nm) using an optical model and Tauc‒Lorentz parametrization. Analyses of chemical and mechanical properties of films allowed for the interpretation of changes in optical properties with deposition conditions. The refractive index was revealed to increase with enhanced effective power due to the increased crosslinking of the plasma polymer network but decreased when increasing the oxygen fraction due to the decrease of polymer crosslinking as the number of carbon bonds in the plasma polymer network was eliminated. A very strong positive correlation was found between the Young’s modulus and the refractive index for oxidized plasma polymer films. The optical properties of films correlated with their chemical properties for the specific deposition conditions used in this study. The band gap (1.9–2.9 eV) was assumed to be widened due to the increased concentration of vinyl groups in oxidized plasma polymer films.

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Functional interlayers with controlled adhesion developed for polymer composites

Cited by 15 publications

References 21 publications

Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites

Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites

Plasma Nanocoatings Developed to Control the Shear Strength of Polymer Composites

Optical Properties of Oxidized Plasma-Polymerized Organosilicones and Their Correlation with Mechanical and Chemical Parameters

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