Effect of thermoplastic coating on interfacial adhesion of oxygen-plasma-pretreated PBO/PPESK composites

Zhang, Xiangyi; Chen, Ping; Han, Debin; Qi, Yu; Ding, Zhiyong; Zhu, Xiuling

doi:10.1016/j.apsusc.2012.11.108

Cited by 13 publications

(9 citation statements)

References 29 publications

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“…The interfacial adhesion is usually poor between the aramid fiber and rubber matrix, which restricts the mechanical properties of the composites, due to a lack of reactive functional groups on the surface and the high crystallinity of the fiber. Epoxy resin coating is an often‐used surface treatment method of the aramid fiber . Thus, the elastic modulus of interphase varies between 3 GPa (fiber coated with the epoxy resin) and 128 MPa (rubber matrix).…”

Section: Resultsmentioning

confidence: 99%

Effects of short fiber tip geometry and inhomogeneous interphase on the stress distribution of rubber matrix sealing composites

Zhang

2014

J of Applied Polymer Sci

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The normal and interfacial shear stress distributions with flat fiber tip of short-fiber-reinforced rubber matrix sealing composites (SFRC) compared with the shear lag model were investigated by using the finite element method (FEM). The results indicate that stress values do not agree with those calculated by the shear lag model. The effect of different geometrical shapes of fiber tip on the stress distributions of SFRC was also investigated. The geometrical shapes of fiber tip under present investigation are flat, semi-elliptical, hemispherical, and circular cone, respectively. The results show that the hemispherical fiber tip transfers the load with less stress concentration and is contributed to controlling the interface debonding failure more effectively than other shapes of fiber tip. Further study on the effect of the inhomogeneous interphase properties on the normal and interfacial shear stresses of hemispherical fiber tip was also conducted. The results indicate that the normal stress increases with the increase of the interphase thickness and interfacial shear stress remains unchanged, and the normal stress values of SFRC with interphase are higher than those without interphase. The interphase elastic modulus has no influence on the stress distributions along the direction to the fiber axis. The stress distributions along the radial direction in the interphase end are largely dependent on the interphase elastic modulus, and the interfacial shear stress is larger than the normal stress, which reveals that a significant part of the external load is transferred from the fiber to the matrix through shear stresses within the interphase.

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Section: Resultsmentioning

confidence: 99%

Effects of short fiber tip geometry and inhomogeneous interphase on the stress distribution of rubber matrix sealing composites

Zhang

2014

J of Applied Polymer Sci

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“…The reason was that the surface of the aramid fiber was smooth, there was a lack of polar groups and chemical activity. In generally, epoxy resin coating was used as the surface treatment method of the aramid fiber . Thus, the elastic modulus of the interphase varied between E e = 3 GPa (fiber coated with the epoxy resin) and E m = 2 MPa (rubber matrix).…”

Section: Resultsmentioning

confidence: 99%

Effects of the short‐fiber tip geometry and interphase properties on the interfacial debonding behavior of rubber matrix composites

Zhang

2015

J of Applied Polymer Sci

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An axisymmetric finite element model of a single fiber embedded in a rubber matrix was established. A cohesive zone model was used for the fiber–matrix interface because of the interfacial failure. The effect of the fiber tip shape on the interfacial debonding of short‐fiber‐reinforced rubber matrix sealing composites (SFRCs) was investigated; the shapes were flat, semi‐elliptical, hemispherical, and conoid, respectively. The initial strain of the interfacial debonding (ε0) was obtained. We found that among the researched fiber tips, ε0 of the SFRC reinforced with the hemispherical tip fiber appeared to be the maximum. The initial locations of interfacial debonding were also determined. The results show that the initial locations of the interfacial debonding moved from the edge to the center of the fiber tip when the ratio of the semimajor axis and semiminor axis of the semi‐elliptical fiber tip increased gradually. Further study on the effect of the interphase properties on ε0 with the hemispherical fiber tip was conducted. The results indicate that an interphase thickness of 0.2 μm and an interphase elastic modulus of about 752 MPa were optimal for restraining the initiation of the interfacial debonding. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42774.

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“…The growing deviation of the composition dependence of the elastic modulus relative to that of the neat matrix from linearity is caused by fiber misalignment, bundling and mechanical length degradation all increasing with v F [4,5,47,48]. The low reinforcing efficiency of the PBO fibers is caused by their weak interfacial adhesion to PMMA as previously reported problematic issue for these fibers [49][50][51][52], extensive fiber bending compromising their unidirectional alignment in tensile direction and local plastic deformation expressed by the presence of the kink bands (Figure 1f) decreasing PBO effective fiber length significantly.…”

Section: Mechanical Propertiesmentioning

confidence: 95%

Toughening of PMMA by short poly(p-phenylene-2,6-benzobisoxazole) fibers

Zbončák¹,

Jančář²

2018

Express Polym. Lett.

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Abstract. We report on unique enhancement of fracture resistance of poly(methyl methacrylate) (PMMA) using short and low bending modulus poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers. While no significant effect of the PBO fibers on stiffness and strength was observed, the strain at break and fracture energy were enhanced substantially. The in situ observations of damage development during the tensile tests showed that the additional extrinsic toughening mechanisms consists of homogenous distribution of micro-cracking and delocalization of the deformation sites to the whole volume of the sample with micro-cracks bridged by the entangled PBO fiber mesh. Employing unique toughening mechanisms of PBO fiber network in hybrid PMMA/CF/PBO composites containing both carbon (CF) and PBO fibers lead to simultaneous enhancement of stiffness, strength and toughness suitable for wide range of engineering applications.

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Effect of thermoplastic coating on interfacial adhesion of oxygen-plasma-pretreated PBO/PPESK composites

Cited by 13 publications

References 29 publications

Effects of short fiber tip geometry and inhomogeneous interphase on the stress distribution of rubber matrix sealing composites

Effects of short fiber tip geometry and inhomogeneous interphase on the stress distribution of rubber matrix sealing composites

Effects of the short‐fiber tip geometry and interphase properties on the interfacial debonding behavior of rubber matrix composites

Toughening of PMMA by short poly(p-phenylene-2,6-benzobisoxazole) fibers

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