Microdebond test development and interfacial shear strength evaluation of basalt and glass fibre reinforced polypropylene composites

Abstract

Interfacial adhesion of basalt and glass fibre reinforced polypropylene composites was studied using microdebond testing technique. A focus was put on a simple approach of applying extruded thermoplastic films as a matrix material for microdroplet formation. The ability of different viscosity and thickness polypropylene films to form symmetrical droplets under a temperature range of 200–240℃ was evaluated. Emphasis was put on polypropylene matrix chemistry, silane fibre surface treatment and testing loading rate impact on interfacial performance change in polypropylene-basalt fibre and polypropylene-glass fibre microcomposites. It was found that it was possible to obtain high symmetrical droplet yield out of polypropylene films of melt flow rate 50 and 125 g/10 min and 55–85 µm thickness at 240℃. The presence of maleic anhydride grafted polypropylene coupling agent increased the interfacial shear strength significantly. Microcomposites with glass fibre had higher interfacial shear strength in comparison with the used basalt fibre, mainly due to the difference in their sizing. Various silane-based fibre surface coatings did not result in significant interfacial adhesion changes. Polypropylene-glass fibre microcomposite interfacial shear strength at 0.5, 3.0 and 10.0 mm min–1 loading rates had similar values with high maximum pull-out force scatter at 0.5 and 3.0 mm min–1 loading rates and low scatter at 10.0 mm min–1.

Enhancing the interfacial adhesion between continuous basalt fibers and epoxy resin by depositing silicon dioxide nanonparticles

“…7 and 42 mJ/m 2 respectively, and the γ p W and γ d W of glycerol are 51.7 and 21.1 mJ/m 2 respectively.The IFSS between CBFs-g-x%-KH550-d-SiO 2 and EP matrix was characterized via droplet microdebond test43 based on a composite material interface microscopic tester (Beijing Fuyouma Technology Co., Ltd., Beijing, China). The length of CBFs-g-x%-KH550-d-SiO 2 embedded in EP droplet was set about 10 µm.…”

The feasibility of continuous basalt fibre‐reinforced polymer application to composite cross‐arms

“…The interface between basalt fibre and polypropylene is only 2.53 MPa, lower than the 4.07 MPa of glass fibre [32]. The same interface treatment method was used to treat basalt and glass fibres, showing that glass fibre can provide greater interface strength [33]. The reason for this phenomenon is that the surface polarity of basalt fibre is greater than that of glass fibre, and the sizing agent suitable for glass fibre cannot spread well on the surface of basalt fibre, so the interface bonding effect of basalt fibre is weak [34, 35].…”

Methods and models for fibre–matrix interface characterisation in fibre-reinforced polymers: a review

“…The preparation of thermoplastic droplets is, therefore, less established. An optimised method was proposed [301] using a cardboard frame with a single fibre glued to it and a rectangularly cut polymer film mounted on the fibre and melted in a convection oven. This is an alternative to those of V-shaped polymer strips [302,303], melting polymer pellets to form films and sandwiching GFs between two films [304] or knotting polymer fibre around CF [305].…”