Structure, mechanical, and fracture properties of nanoreinforced and HNBR‐toughened polyamide‐6

Abstract

Hydrogenated nitrile rubber (HNBR) and synthetic nanofillers, viz. water-swellable sodium fluorohectorite (FH) and water dispersible boehmite alumina (BA), were used to toughen and reinforce polyamide-6 (PA-6). FH and BA were introduced in HNBR latex that was dried prior to melt mixing with PA-6. Binary blend (PA-6/ HNBR) and ternary nanocomposites (PA-6/HNBR/nanofiller) were produced and their structure-property relationships studied. HNBR was coarsely and microscale dispersed in PA-6. FH, slightly intercalated, was present in PA-6 and in the PA-6/HNBR interphase, whereas BA was mostly located in the HNBR droplets. HNBR improved the ductility of the PA-6/HNBR blend at cost of stiffness and strength. The fracture toughness and energy, determined on notched Charpy specimens at different temperatures (T ¼ À30 C, room temperature, and T ¼ 80 C) were improved by blending with HNBR at 9 wt %. Additional incorporation of the nanofillers in 2.5 wt % enhanced the stiffness and strength of the PA-6/HNBR blend but reduced its ductility. The fracture toughness of the ternary nanocomposites was between those of PA-6 and PA-6/HNBR, whereas their fracture energy fairly agreed with that of the parent PA-6.

Nano-Scale Reinforcing and Toughening Thermoplastics: Processing, Structure and Mechanical Properties

“…Additional incorporation of CNF increases the tensile strength and reduces the elongation at break of the POM/PU blend confirming that CNF acts as reinforcement. For the incorporation of FH and BA particles based on HNBR/PA-6 systems (Siengchin & Karger-Kocsis, 2011), the ductility was strongly reduced compared to the PA-6 matrix. Due to the rubbery character of the incorporated HNBR, the PA-6/HNBR blend exhibits markedly lower stiffness than the parent PA-6.…”

Binary and ternary composites of polystyrene, styrene–butadiene rubber and boehmite produced by water-mediated melt compounding: Morphology and mechanical properties

“…Compounding with both rubber and rigid nanoparticles [14][15] has attracted considerable attention in R&D activities due to the promise of simultaneous improvements in stiffness and toughness characteristics of the corresponding polymeric composites. It was shown recently that the ternary composite composed of nanofiller/rubber/polyamide-6 (PA-6) and produced by water-mediated melt compounding (WM) outperformed the parent PA-6 with respect to fracture toughness [16]. We have also demonstrated on the example of polyoxymethylene (POM) that both toughening and reinforcing can be achieved on line using this compounding technique [17].…”

Room temperature and low temperature toughness improvement in SAN/ASA blends by blending with CPE, HNBR, and BR

“…Hydrogenated nitrile butadiene rubber (HNBR) and chlorinated polyethylene (CPE) are both special rubbers with many brilliant properties, e.g., aging resistance, thermal stability, oil resistance, and so on. They have excellent toughening effect in many polymer matrix, such as SAN, nylon, and PVC, etc. In our previous works, the toughening effect of CPE and HNBR in SAN/ASA blends has been studied, respectively.…”