Abstract The effect of successive injection moldings on the thermal, rheological, and mechanical properties a polypropylene impact copolymer (PP) was investigated. crystal content decreased as molecular weight due to chain scission with repeated molding. Young modulus yield stress remained constant, despite drop in strain break. Virgin recycled PP matrix were filled nanosized calcium carbonate (CaCO 3 ) particles. morphology thermal nanocomposites virgin CaCO particles also studied. strongly...

The present article investigates the recycling effect on properties of dilute suspension HDPE reinforced by SGF without coupling agents. This at different proportions loading was produced melt compounding cycles with a single screw extruder. differential scanning calorimetry results have shown an increase in crystallinity proportion and number extrusions. varies from 8.2% for neat 5 extrusions to 13.3% 10% 3 Besides, rheological measurements decrease viscosity matrix 33,800 Pa.s 24,500 after...

Abstract Degradation of poly(butylene terephthalate) (PBT) induced by blending time at 260°C leads to an increase both carboxylic end groups and melt viscosity index a decrease the molecular weights. Crystallization kinetics pure PBT blended with epoxide, which was used reduce free acid concentration, were compared. Lower concentrations obtained, but weights still decreased. The crystallization pigments and/or mineral fillers also studied. Dyes, some are known for their nucleation activity,...

Calcium carbonate (CaCO 3 ) reinforced polypropylene/ethylene propylene rubber (PP/EPR) copolymer composites for automotive use were developed by means of extrusion and injection molding process. Three kinds CaCO (stearic acid treated untreated) nanoparticles microparticles used as fillers. The influence stearic acid, particle size, filler content on the state distribution morphology investigated SEM rheological measurements. Two different morphologies observed: EPR dispersed in PP matrix a...

The calorimetric characteristics of carbon black (CB)/poly(ethylene-co-alkyl acrylate) composites depend on both the CB and acrylate contents. An increase content in pure copolymers tends to decrease all crystalline characteristics: Tc,n, nonisothermal crystallization temperature; Tm, melting temperature, ΔHm, enthalpy. modifies kinetics poly(ethylene-co-ethyl (EEA) alone blends with poly(ethylene-co-24% w/w methyl (24EMA) poly(ethylene-co-35% (35EMA). In presence CB, temperature EEA,...

The mechanical and toughening properties of ternary nano-composites (polypropylene/polyolefin elastomer/calcium carbonate) are investigated. Blends polypropylene (PP)/ethylene-alpha olefin copolymer (polyolefin elastomer)/nano calcium carbonate were prepared through a two-step process. Stearic acid-treated CaCO 3 (denoted CC322) non-treated CC31) used at content 1%, 3%, 5%. Two polyolefin elastomers (POE), ethylene-butene ethylene-octene copolymers 5 wt% also to adjust the phase structure...

Abstract The influence of pigments and mineral fillers on the crystallization kinetics poly(vinylidene fluoride) (PVDF) in its blends with poly(methyl methacrylate) (PMMA) was studied by Differential Scanning Calorimetry Optical Microscopy. introduction organic or into PVDF results a more less significant increase non‐isothermal temperatures, depending additives used. In PVDF, pigment nucleation activity is quite different from that previously found poly(butylene terephthalate) (PBT)....

Abstract Crystallization of semi‐crystalline polyolefins (i‐polypropylenes and HD‐polyethylenes) in their blends with amorphous cycloolefin copolymers (COC) were studied. The thermal behaviour the was characterized by Differential Scanning Calorimetry (DSC) whereas blend morphologies investigated Electronic Microscopy (SEM). In iPP/COC blends, a phenomenon fractionated crystallization is evidenced when i‐PP finely dispersed COC matrix. Such behavior generally observed number droplets much...

Abstract The use of volume fractions in the empirical mixing laws to predict glass transition temperatures (Tg) polymer blends provides good agreement with experimental values, even for systems different densities. No adjustment parameter is therefore required whereas Gordon‐Taylor and Kwei equations based on weight need a fitting which has be determined from data. This assumption was validated Tg measurements through DSC experiments conducted PMMA /PVDF have significantly

AbstractAbstractCo-continuous extruded polyester-carbon black filled polyalkene blends exhibit a slightly positive temperature coefficient, which depends on the nature of polyester. From studies various polyesters (poly(butylene terephthalate), poly(ethylene and some their blends), it appears that coefficient becomes higher when are heated above glass transition Polyalkene melting induces hysteresis effect between heating cooling steps. Attempts to catalyse grafting through enhanced...

The common reed, Phragmites australis , is a plant species quite similar to the currently used bio-based aggregates and available on most continents. purpose of this work characterise reed compare its properties other plants already studied for building use. This study presents different focussing chemical composition, hydrophobicity nature how character could be explained. To that end, wettability also water adsorption measurements were carried out flour in comparison miscanthus, wood hemp...

Abstract Crystallization of binary blends semi-crystalline polyolefins (i-polypropylene and HD-polyethylenes) amorphous cycloolefin copolymers (COC) was followed by Differential Scanning Calorimetry (DSC). Blend morphologies were investigated Electronic Microscopy (SEM). The thermal behavior morphology iPP–COC are characteristic immiscible blends. two crystallization exotherms observed on cooling from the melt explained in terms fractionated crystallization. This phenomenon occurs when iPP...

Abstract The dynamic mechanical and dielectric behaviours of Polypropylene (PP) (Ethylene‐Vinyl Acetate) Copolymer (EVA) blends are reported as a function the morphology. For EVA contents lower than 20%, show two‐phase morphology characteristic immiscible blends, with spherical droplets finely dispersed in PP matrix. After stretching molten state, fibers is observed. Mechanical Relaxation Spectroscopy display three relaxation processes: α‐relaxations associated to glass transitions...

Abstract The effects of the composition and resulting morphology on crystallization rheology blends containing poly(butylene terephthalate) (PBT) an ethylene‐ co ‐ethyl acrylate (EEA) copolymer, two immiscible polymers, were studied over entire range volume fractions. Differential scanning calorimetry (DSC) thermograms recorded during cooling showed important differences, mainly in terms PBT temperatures, depending blend composition. In addition to classical peaks EEA, a third peak appeared...