Toughened and stiffened nanocomposites based on an amorphous polyamide modified with both styrene/ethylene‐co‐butylene/styrene triblock copolymer and an organoclay

Abstract

Polymer nanocomposites (PNs) based on an amorphous polyamide (aPA) modified with both a maleated rubber (mSEBS) for toughening, and with an organically modified organoclay for stiffening were obtained in the melt state. The PNs were highly dispersed and the organoclay was exclusively located in the aPA matrix. However, they showed a fine particle size that was larger than that of the corresponding blends. This indicates a lower compatibilization in the PNs that was attributed to a slight surfactant migration to the matrix during processing in the melt state. The increases in the modulus of elasticity upon organoclay (OMMT) addition were high enough to counteract the modulus decrease inherent to a 15% rubber addition. This allowed us to obtain a toughened aPA with a modulus similar to that of the unmodified aPA. The critical interparticle distance was lower in the PNs than in the corresponding blends. This decrease was attributed to the higher modulus of elasticity of the PNs matrix. V C 2011Wiley Periodicals, Inc. J Appl Polym Sci 124: [935][936][937][938][939][940][941][942] 2012

Halloysite Nanotubes Filled in Asymmetric Blend of Polyamide 6, 12/poly (Ethylene‐Octene) Elastomer: Tough‐to‐Brittle Transition in Nanocomposites

“…The domain‐size ( D n ) of the dispersed rubber particles increased with 5 wt% of HNT loading whereas on further increasing the HNT content (>5 wt %), the domain size remained nearly unaffected. Similar observations are reported in case of PA‐6/SEBS‐g‐MA/clay and a‐PA/SEBS‐g‐MA/clay nanocomposites …”

“…Similar observations are reported in case of PA-6/SEBS-g-MA/clay and a-PA/SEBS-g-MA/clay nanocomposites. [24,25] Dynamic Mechanical Analysis Dynamic mechanical analysis of the injection molded test specimens with dimensions of 35 Â 13 Â 3 mm 3 has been carried out to obtain the viscous and elastic response in the temperature range of À80 C to 130 C and the effect of HNT incorporation on the T g of investigated nanocomposites. The DMA revealed variation of storage and loss moduli (E' and E") as a function of HNT content and temperature are shown in Figure 4.…”

Organoclay‐reinforced compatible blends of polypropylene with an amorphous polyamide

“…Ascertaining the elasticity modulus of the NCs with two different amounts of the dispersed phase in the gPP matrix allows us to find out whether or not a dispersed nanocomposite phase in the matrix and its content influence its modulus, as compared with the presence of the nanoclay in the matrix. This has been studied in the case of rubbery modified NCs where the impact strength is the most important property. However, to our knowledge, no studies have been carried out on dispersed polymeric nonrubbery phases where the modulus of the NCs plays a more important role.…”

Super Toughening, Strengthening, and Antimicrobial Behaviors of Cyclic Olefinic Copolymer/Few Layer Graphene Nanocomposites

“…Usually, the incorporation of small concentrations of graphene in the polymer matrices enhanced the stiffness and strength at the expense of ductility depending upon the dispersion and interaction with the matrix . While, in some particulate‐filled polymer nanocomposites, the increase in toughness as compared with neat polymer is also found . However, nanoclay or nanosilica based polymer nanocomposites showed an order of magnitude increase in the toughness along with the reinforcement in strength and stiffness .…”