Effect of graphite nanoplatelets on fracture behavior of HDPE/PA66 microfibrillar composites

Abstract

Effect of in situ formation of PA66 fibrils and modification with graphite nanoplatelets (GNP) on fracture behavior of the high‐density polyethylene (HDPE)‐matrix microfibrillar composites (MFC) has been evaluated using tensile impact strength (TIS) and J‐integral methods. According to J‐integral, the main mechanism of failure is unstable crack growth; dissimilar layout of both methods causes different contribution of reinforcement with GNP and PA66 fibrils to fracture process evaluated. More marked orientation and parallel loading lead to increase in impact energy by both GNP and fibrils in TIS; on the other hand, much lower contribution of fibres and even negative effect of GNP pre‐blended in HDPE was found for J‐integral as a consequence of load acting in perpendicular direction. The fact that lower addition of GNP pre‐blended in PA66 does not deteriorate impact behavior indicates that such modification of MFC is an efficient way to get materials with enhanced, well‐balanced parameters. POLYM. ENG. SCI., 59:382–388, 2019. © 2018 Society of Plastics Engineers

High erosion resistance thermoplastic polyurethanes composites fabricated via intercalation reinforced interfacial interaction

“…[16][17][18][19] The common modifiers, such as coupling agents, surfactants, and acids, are limited in their application because of the complicated reaction steps, environmental unfriendliness, low grafting rate, and high cost. [20][21][22] In view of these, mussel-inspired chemistry with dopamine (DA) considered as a mild and ecofriendly reagent for nanofiller surface modification has attracted tremendous interest in research by virtue of their extraordinary adhesion, simplicity, and stability properties. [23][24][25] DA can form a poly(dopamine) (PDA), and its modification enhances hydrogen bond interactions between the nanofiller and the polymeric matrix, thus improving the dispersion of the nanofiller.…”

“…In order to solve the above problem, surface functionalization strategy is frequently used to achieve good dispersion and enhance interfacial interactions 16–19 . The common modifiers, such as coupling agents, surfactants, and acids, are limited in their application because of the complicated reaction steps, environmental unfriendliness, low grafting rate, and high cost 20–22 . In view of these, mussel‐inspired chemistry with dopamine (DA) considered as a mild and ecofriendly reagent for nanofiller surface modification has attracted tremendous interest in research by virtue of their extraordinary adhesion, simplicity, and stability properties 23–25 .…”