Surface modification of glass fibers by oxidized plasma coatings to improve interfacial shear strength in GF/polyester composites

2017 ◽  
Vol 40 (S1) ◽  
pp. E186-E193 ◽  
Author(s):  
V. Cech ◽  
A. Knob ◽  
T. Lasota ◽  
J. Lukes ◽  
L.T. Drzal
Keyword(s):  
Shear Strength ◽  
Surface Modification ◽  
Interfacial Shear Strength ◽  
Glass Fibers ◽  
Interfacial Shear ◽  
Polyester Composites ◽  
Plasma Coatings

scholarly journals Enhanced Interfacial Shear Strength and Critical Energy Release Rate in Single Glass Fiber-Crosslinked Polypropylene Model Microcomposites

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2552 ◽  
Author(s):  
Uwe Gohs ◽  
Michael Mueller ◽  
Carsten Zschech ◽  
Serge Zhandarov
Keyword(s):  
Shear Strength ◽  
Electron Beam ◽  
Energy Release Rate ◽  
Glass Fiber ◽  
Release Rate ◽  
Interfacial Shear Strength ◽  
Glass Fibers ◽  
Critical Energy ◽  
Interfacial Shear ◽  
Critical Energy Release Rate

Continuous glass fiber-reinforced polypropylene composites produced by using hybrid yarns show reduced fiber-to-matrix adhesion in comparison to their thermosetting counterparts. Their consolidation involves no curing, and the chemical reactions are limited to the glass fiber surface, the silane coupling agent, and the maleic anhydride-grafted polypropylene. This paper investigates the impact of electron beam crosslinkable toughened polypropylene, alkylene-functionalized single glass fibers, and electron-induced grafting and crosslinking on the local interfacial shear strength and critical energy release rate in single glass fiber polypropylene model microcomposites. A systematic comparison of non-, amino-, alkyl-, and alkylene-functionalized single fibers in virgin, crosslinkable toughened and electron beam crosslinked toughened polypropylene was done in order to study their influence on the local interfacial strength parameters. In comparison to amino-functionalized single glass fibers in polypropylene/maleic anhydride-grafted polypropylene, an enhanced local interfacial shear strength (+20%) and critical energy release rate (+80%) were observed for alkylene-functionalized single glass fibers in electron beam crosslinked toughened polypropylene.

SYNERGISTIC EFFECTS OF PLASMA POLYMERIZATION AND COVALENT SURFACE MODIFICATION OF CARBON FIBERS

2021 ◽  
Author(s):  
DANIEL J. EYCKENS ◽  
LACHLAN SOULSBY ◽  
FILIP STOJCEVSKI ◽  
ATHULYA WICKRAMASINGHA ◽  
LUKE C. HENDERSON
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Surface Modification ◽  
Carbon Fibers ◽  
Plasma Polymerization ◽  
Interfacial Shear Strength ◽  
Synergistic Effects ◽  
Interfacial Shear ◽  
Carbon Fibres ◽  
Electrochemical Pretreatment

This work demonstrates the efficacy in performing an electrochemical pretreatment on carbon fibres to improve the effect of plasma polymerization of acrylic acid on these surfaces. Modified samples demonstrated improve physical properties including tensile strength and Young’s modulus, as well as an increase in composite performance as measured by the interfacial shear strength. The electrochemical pretreatment was shown to enhance the advantages observed when coating fibres using plasma polymerization.

Modification of the Interface in Carbon Nanotube-Grafted T-Glass Fiber

2012 ◽  
Author(s):  
H. Kawada ◽  
S. Sato ◽  
M. Kameya
Keyword(s):  
Shear Strength ◽  
Epoxy Resin ◽  
Interfacial Shear Strength ◽  
Glass Fibers ◽  
Chemical Vapor ◽  
Interfacial Shear ◽  
Interfacial Region ◽  
Shear Lag ◽  
Reinforced Plastics ◽  
Elastic Shear

In recent years, carbon nanotubes (CNTs) have attracted a lot of interest as an additional component in fiber reinforced plastics (FRP) to improve the properties of the fiber/matrix interface. An improvement of the apparent interfacial shear strength (ISS) was achieved by grafting CNTs onto reinforcement fibers instead of dispersing CNTs in the matrix. In one study, composites containing CNT-grafted fibers and epoxy resin demonstrated 26% ISS improvement over the baseline composites. However, few studies are focused on glass fibers, due to their low heat resistance. In this study, the effects of grafting CNTs onto T-glass fibers were evaluated by investigating the mechanical and interfacial properties of the CNT-grafted fiber/epoxy resin model composites. Elastic shear-lag analysis was also used to investigate the effect of CNTs on ISS. We used the chemical vapor deposition (CVD) method to graft CNTs onto T-glass fibers. As a result, CNTs were grafted relatively uniformly and cylindrically onto the fibers, which indicates that the CNT-grafting process was appropriate. The CNT-grafted fiber/epoxy resin model composites showed a significant (46∼67%) increase of interfacial shear strength. The formation of an interfacial region containing CNTs was observed around each fiber. Elastic shear-lag analysis showed a 20% increase of ISS. Those results imply that the elastic modulus of the interfacial region around the fibers was higher than that of epoxy resin.

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

Fibers ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 58 ◽  
Author(s):  
Antonin Knob ◽  
Jaroslav Lukes ◽  
Lawrence Drzal ◽  
Vladimir Cech
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Glass Fiber ◽  
Polymer Composites ◽  
Polymer Matrix ◽  
High Performance ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
High Performance Polymer ◽  
Polyester Composites

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.

Estimation of the True Interfacial Shear Strength for Composite Materials With the Microbond Test

2013 ◽  
Author(s):  
Jason T. Ash ◽  
Lidvin Kjerengtroen ◽  
William M. Cross ◽  
Jon J. Kellar
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Computational Study ◽  
Optical Glass ◽  
Glass Fibers ◽  
Test System ◽  
Interfacial Shear ◽  
Bead Geometry ◽  
Failure Theory ◽  
Microbond Test

Conservative estimates of the true interfacial shear strength (IFSS) were obtained by applying the Coulomb-Mohr failure theory to microbond test data in this combined experimental and computational study. Experimentally, interfacial strengths of unsaturated polyester on untreated and silane treated optical glass fibers were measured with an axisymmetric microbond test system. Commonly reported average IFSS values were 6.51 MPa for untreated fibers and 8.01 MPa for silane treated fibers with coefficients of variation that ranged from 9.7–22%, which was an improvement from the previous parallel blade system that ranged from 17–66%. Axisymmetric finite element analysis (FEA) was completed with the aid of a Microbond Input Generator program that reduced model development and analysis time by 97% from 1000 minutes to under 30 minutes making this feasible to perform FEA on every experimental microbond sample. FEA models include the complex microbond bead geometry, contact loading conditions, and constituent material properties measured according to ASTM standards. Application of the Coulomb-Mohr failure theory revealed a conservative estimate of the true IFSS in the absence of compressive radial stresses to be 19.2 MPa for untreated fibers and 25.1 MPa for silane treated fibers. Comparisons are also made with the maximum IFSS value.

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