Effect of compounding sequence on the morphology of organoclay‐filled PA6/PP/MAPP blends

Abstract

Four types of compounding sequences were utilized to prepare organoclay-filled polyamide 6 (PA6)/polypropylene (PP)/maleic anhydride grafted PP (MAPP) blends. The amount of PA6 molecules grafted to MAPP during in situ compatibilization reaction and the distribution ratio of organoclay in the continuous phase and interface zone were determined quantitatively. The relationship among dispersion and distribution states of organoclay, the amount of PA6 grafted to MAPP as well as the deformation, breakup and coalescence of dispersed droplets was elucidated to interpret the difference in phase morphology. Crystallization behavior and dynamic mechanical properties were also investigated and correlated with the morphology of the materials. It has been shown that the PA6/organoclay masterbatch approach results in the smallest average domain size because of the best organoclay dispersion, the highest amounts of PA6 grafted to MAPP, and organoclay at the interface, which efficiently stabilizes the droplets and prevents coalescence of the droplets. The material prepared by this approach has the biggest improvement in dynamic storage modulus.

Effect of glass fiber on the electrical resistivities of polyoxymethylene/maleic anhydride‐grafted polyethylene/multiwalled carbon nanotube composites

“…The GF (ECS 305K), with a length of 4.5 mm and amino groups (the atomic concentration of N is 2.36% as measured by XPS) on the surface, was provided by Chongqing Polycomp International (Chongqing, China). The MAPE and MAPP were prepared in our laboratory . The HDPE (5200B) was provided by SINOPEC Beijing Yanshan Company (Beijing, China).…”

Polyamide blend-based nanocomposites: A review

“…The presence of the filler added via the single-step procedure widened the range of co-continuity and, thus, enhanced the mechanical strength at high temperatures due to the continuity of the PA6 phase. Wang et al [69] prepared organoclay-filled PA6/PP/ maleic anhydride-grafted PP (MAPP) blends using four types of compounding sequences (e.g., direct mixing, one-step mixing, a master-batch approach, or a pre-blending approach). The PA6/organoclay master-batch approach resulted in the smallest average domain size because it had the best organoclay dispersion, the highest amounts of PA6 grafted to MAPP, and localization of the organoclay at the interface, which efficiently stabilized the droplets and prevented droplet coalescence.…”

“…In the presence of compatibilizer it will further influences morphology evolution by reducing interfacial tension and suppressing droplets coalescence. It was found that in most of the cases adding organoclay to the preblend of PA6/the second polymer/maleinized polymer gives the smallest particle size, because the reaction between PA6 and the maleinized polymer can be maximized if organoclay is added after preblending [69]. In general, the microstructure in PA blend-based nanocomposites was significantly influenced by the blending sequence, which affecting their mechanical properties.…”

Effect of Mixing Sequence on Phase Morphology and Mechanical Properties in Polyamide 6/Butadiene (Core) Styrene Acrylonitrile-G-Maleic Anhydride (Shell) Latex/Organoclay Ternary Nanocomposites

“…[16,17] There are many reports focused on polyamide/maleated elastomer/organoclay composites. [18][19][20][21][22][23] The functionalized rubber contains a reactive group, maleic anhydride (MA), which can react in situ with the terminal amide groups of polyamides so as to improve the interfacial compatibility because of the formation of graft copolymers. Therefore, MA-grafted elastomers, like ethylene-propylene rubber-g-MA or EPDM (ethylene-propylene-diene rubber)-g-MA, are frequently used for toughening polyamides.…”