Up to now, metal–organic frameworks (MOFs) with open nanostructures have shown outstanding capabilities in trapping smoke particles compared the original MOFs. However, only a few MOF-based strategies been reported synthesize hierarchical porous cages thus far, which are mainly restricted environmentally unfriendly wet-chemical liquid methods. Herein, as proof-of-concept, gas-steamed framework approach was designed fabricate series of cheeselike porosity. Briefly, zeolitic imidazolate...

Abstract Combined effects of clay treatment and compatibilizer polymers on the structure properties polypropylene/clay nanocomposites were studied. Dynamic mechanical analysis was used to analyze comparatively dynamic response different prepared from polypropylene montmorillonite‐rich bentonite, relate such with material microstructure. Two bentonites used: a purified Spanish natural bentonite organophillized by means 11‐undecyl‐ammonium ion commercial dimethyl dehydrogenated tallow ammonium...

Abstract This article presents the analysis of processing parameters influence on foaming behavior and cellular structure PP‐montmorillonite foams. Polypropylene nanocomposites containing 5.0 phr an organically‐modified montmorillonite (MMT) were initially melt‐compounded in a twin‐screw extruder with azodicarbonamide (ADC) later foamed using one‐step compression‐molding process. The morphology foams was assessed both scanning transmission electron microscopies. A time‐dependant...

Microcellular foams of poly(methyl methacrylate) with variable concentrations an organically modified montmorillonite, oMMT (2.5–10 wt %), were prepared using a supercritical CO2 dissolution physical foaming process. Particular importance was given to the analysis influence montmorillonite on desorption behavior out several nanocomposites. The saturation concentration found be two times higher in nanocomposites when compared pure PMMA and comparative curves showed that remained for long...

Microcellular foams of polystyrene (PS), poly(styrene-co-acrylonitrile) (SAN), and poly(methyl methacrylate) (PMMA) having organically modified layered double hydroxides (LDH) were prepared using a high-pressure CO2 dissolution foaming process characterized both structurally thermo-mechanically. The saturation concentration was found to increase with the incorporation LDH nanoparticles into PMMA, while opposite effect observed in PS SAN nanocomposites respect pure polymers. desorption...

Abstract The properties of polypropylene (PP) foams can be extended by controlling the cellular structure and adding functional fillers. PP‐based microcellular having an interesting combination mechanical transport were prepared two different batch foaming processes. processes employed a semisolid state CO 2 dissolution physical process chemical one based on gases generated thermal decomposition blowing agent in molten state. role nanofillers (5 wt% organoclay 10–20 cellulosic fibers) foam...

This work presents the preparation and characterization of compression‐moulded montmorillonite carbon nanofibre‐polypropylene foams. The influence these nanofillers on foaming behaviour was analyzed in terms parameters final cellular structure morphology Both induced formation a more isometric‐like foams, mainly observed for MMT‐filled nanocomposite Alongside their crystalline characteristics, foams were also characterized compared with unfilled ones regarding dynamic‐mechanical thermal...

This article presents the preparation of microcellular polypropylene foams produced by a CO 2 batch-foaming process and their characterization regarding influence pressure drop rate on foaming behavior dynamic—mechanical properties. A polypropylene-based material was prepared melt-mixing in twin-screw extruder, cooled, pelletized later compression-molded hot-plate press to solid discs. These discs were finally foamed inside high vessel dissolving carefully controlling its sudden...

The present work proposes to investigate the effect of an ultrahigh molecular weight silicone rubber (UHMW-SR) and two ethylene methyl acrylate copolymers (EMA) with different (MA) content on mechanical fire performance a fireproof acrylonitrile butadiene styrene copolymer (ABS) composite, optimum amount ammonium polyphosphate (APP) aluminum diethyl phosphinate (AlPi). ABS formulations global flame retardant 20 wt.% (ABS P) were melt-compounded, without EMA UHMW-SR, in Brabender mixer....

By having a challenging prospect of developing more environmentally friendly flame-retardant (FR) acrylonitrile-butadiene-styrene (ABS) formulations, an initial study related to the effect combining ammonium polyphosphate (APP) with cork powder (C), bio-waste industry on ABS-FR thermal stability and fire performance is proposed discussed in present work. ABS composites global filler weight content 30 wt.% were prepared by using melt-compounding process. Two different types decomposition...

Abstract Poly (lactic acid) (PLA) nanocomposites based on single and hybrid organic‐modified montmorillonites were previously studied in terms of their morphological, thermal fire performance. As surfactants the organoclays influenced compatibility between nanofillers PLA with different degrees clay platelets dispersion, present work investigated effect these features mechanical properties nanocomposites. specimens analyzed by dynamic‐mechanical‐thermal analysis, which pointed out changes...

In this paper, carbon-nanofibre-reinforced polypropylene foams were prepared and characterized regarding their foaming behaviour, cellular structure both thermo-mechanical as well electrical properties. Polypropylene (PP) nanocomposites containing 5, 10 20 wt% of carbon nanofibres (CNF) a chemical blowing agent by melt-mixing inside twin-screw extruder subsequently water-cooled pelletized. The extruded later foamed using one-step compression-moulding process. properties the CNF-reinforced PP...

Carbon nanofibre-reinforced polypropylene nanocomposites containing from 5 to 20 wt.% of carbon nanofibres and a chemical blowing agent were melt-compounded later foamed using compression-moulding. Alongside their foaming behaviour analysis cellular characterization, foams showing an increasingly finer isometric structure with increasing the amount nanofibres, thermal conductivity was determined Transient Plane Source Method (TPS). Contrarily electrical conductivity, which has previously...

This paper presents the characterization of cellular structure and thermal conduction behaviour polypropylene foams produced using different foaming processes, with aim selecting best possible PP foam insulator. Thermal conductivity results have shown that global heat transfer is controlled by relative density. For densities higher than 0.2, differences were insignificant, data being predicted mixture's rule Russell's model. In low density range, all proposed models underestimated overall...

Polycarbonate foams reinforced with 0,5 wt% of graphene were obtained by firstly melt-mixing the polycarbonate and in an internal mixer, compression-moulding melt-compounded grinded material lastly dissolving CO2 inside a high pressure vessel. The desorption behaviour unfilled nanocomposite was studied terms saturation concentration diffusion coefficient, graphene-filled displaying higher loss rate when compared to neat polycarbonate. cellular structure found be highly dependent on...

Abstract Composites of polystyrene (PS) and poly(styrene‐ co ‐acrylonitrile) (SAN) containing a fraction dodecylsulfate‐modified Mg–Al layered double hydroxide (LDH) were prepared by means melt‐extrusion process. The structure morphology analyzed with wide‐angle X‐ray scattering transmission electron microscopy, respectively. spectra the PS matrix composite displayed diffraction peak characteristic hybrid LDH basal plane at 2θ = 3.1 deg. SAN did not exhibit such peak. Both composites an...