Abstract The influence of organomodified nanoclay (montmorillonite) on the crystallization and melting mechanisms isotactic polypropylene (iPP) was studied. Films both neat polymer clay nanocomposites were prepared after molecular weight optimization through melt extrusion. Products exhibited tactoidlike morphology since no compatibilizers used. effect introduction within studied isothermal linear heating. results indicated that low concentrations induce formation β‐crystalline structure,...

Isotactic polypropylenes (iPP) with different melt flow indexes (MFI) were used to fabricate nanocomposites (NCs) 10 wt % loadings of multi-wall carbon nanotubes (MWCNTs) using ultrasound-assisted extrusion methods determine their effect on the morphology, flow, and electrical properties NCs. Three types iPPs MFIs 2.5, 34 1200 g/10 min. Four NC fabrication based used. In first method without ultrasound assistance was second third methods, an probe attached a hot chamber located at exit die...

Ag/TiO2 nanocomposites are usually regarded as an effective synergy for high antimicrobial performance under ultraviolet-visible light conditions. This study confirmed that the surface plasmon resonance of Ag NPs plays important role in relation to size and consequently with antibacterial effect nanocomposite. We observed visible reactivity TiO2 cannot be amplified when it is supporting have inactive photocatalytically surface. The results effectiveness nanocomposite based on supported-TiO2...

The main variables involved in solid-state polymerization of PET homopolymers, originally with molecular weight within the commercial range, were sequentially studied to determine their influence polymerized products. These precursor crystallinity, catalyst, and time reaction temperature. An increasing sequence was then used study bulk crystallization behavior Avrami analyses. It determined that thermal conditions at dissolution affect prereaction morphology. This important process because...

Thermo-mechanical degradation of polypropylene (PP) during reprocessing causes significant changes in its properties and presents a challenge to recycling. In this study, PP was reprocessed multiple times (1 5 cycles, at 240, 260, or 280 °C), the physical structural material were evaluated. comparison virgin PP, polymer presented higher carbonyl index, melt flow lower average molecular weight, narrower polydispersity. Changes these parameters became more pronounced as processing time...

Metamaterial behavior of polymer nanocomposites (NCs) based on isotactic polypropylene (iPP) and multi-walled carbon nanotubes (MWCNTs) was investigated the observation a negative dielectric constant (ε′). It is demonstrated that as switches from to positive, plasma frequency (ωp) depends strongly ultrasound-assisted fabrication method, well melt flow index iPP. NCs were fabricated using extrusion methods with 10 wt % loadings MWCNTs in iPPs different indices (MFI). AC electrical...

Silver nanoparticles supported on titanium dioxide (Ag/TiO 2 ) were incorporated and evaluated as antibacterial additive for polystyrene materials. These particles synthesized using a deposition-precipitation method by adding silver nitrate metallic precursor, sodium hydroxide reducing agent, commercial TiO (P25) support. Rectangular pieces of (PS) containing 100, 300, 500, 700 ppm (wt.%) the made an extrusion-injection molding process, they their properties against Escherichia coli Pour...

Abstract A relationship between chain graft density calculated by coarse‐grained simulation and the one obtained from experimental results is compared in present work. Two slip additives for polypropylene films were studied, erucamide stearyl erucamide. The diffusion equation (Fick's second law) was used to relate real‐time with simulations rendered additive surface as a function of coefficient friction. normalized values showed qualitative trend consistent experimentally observed results.

The transformation of fog at a non-visible water layer on membrane low-density polyethylene (LDPE) and ethylene-vinyl acetate (EVA) was evaluated. Nonionic surfactants major demand in the polyolefin industry were studied. A kinetic study using hot chamber showed that condensation is controlled by both diffusion permanency surfactant more than change surface energy developed wetting agents. greatest anti-fog effect LDPE/EVA close to 3000 h. contact angle results demonstrated ability agent...

Use of multi-wall carbon nanotubes (MWCNTs) in external layers (A-layers) ABA-trilayer polypropylene films was investigated, with the purpose determining intrinsic and extrinsic factors that could lead to antistatic behavior transparent films. The incorporation 0.01, 0.1, 1 wt % MWCTNs A-layers done by dilution through masterbatch method. Masterbatches were fabricated using isotactic (iPP) different melt flow indexes 2.5, 34, 1200 g/10 min, ultrasound assist methods. It found containing...

The connection between fundamental interactions acting in molecules a fluid and macroscopically measured properties, such as the viscosity colloidal particles coated with polymers, is studied here. role that hydrodynamic Brownian forces play dispersions also discussed. It argued many body systems which all these take place can be accurately solved using computational simulation tools. One of those modern tools technique known dissipative particle dynamics, incorporates forces, well basic...

The microkinetics of crystallization and the melting behavior solid-state polymerized poly(ethylene terephthalate) (PET) have been studied. After correlating data with secondary nucleation theory a single regime growth, positive correlation was found between molecular weight, free energy products, transport activation energy. results indicate that PET might be correlated III if is assumed to apply. They also support model involving primary increased branching when weight increases. PET,...

ABSTRACT The present work considers the evaluation of recycled polymers, which are generally incompatible and degraded during recycling with fatal consequences to their thermal mechanical properties. Regarding this subject, synthesis a new compatibilizer in network form was carried out order counter such incompatibility. In sense, low density polyethylene (LDPE) poly(ethylene terephthalate) (PET) were compatibilized via implementation an interpenetrating polymer (IPN), specifically...

Abstract Incorporating nanoparticles into polymer matrices for enhanced antimicrobial properties is particularly interesting. This study examines how the interlayer distribution of zinc oxide (ZnO) decorated with silver (AgNPs) within poly(methyl methacrylate) (PMMA) films impacts their activity. Various PMMA multilayer were prepared, additive intentionally placed in outer, core, bottom, or throughout all layers. Their efficacy was tested against gram‐negative ( Escherichia coli ) and...

The crystallization of isotactic polypropylene wax (iPP) in the presence different sorbitol structures was studied. Dibenzylidene Sorbitol (DBS), as well two its derivatives with one or methyl groups DBS molecule (MDBS and DMDBS, respectively), were tested nanometer-size fibrillar templates. early nucleation stage crystal morphology analyzed Real-Time Wide-Angle X-ray Scattering (WAXS) polarized optical microscopy (POM). It found that iPP crystals showed an α-phase unit cell for three...