The degree of crystallinity cellulose was used for assessing the degradation level coated and uncoated samples pine wood after weathering. X-ray diffraction (XRD) Fourier Transform Infrared (FT-IR) spectroscopy measured changes in surface resulting from weathering, both natural artificial. Both techniques revealed an increase index (CI) when subjected to An size crystallites also observed by XRD measurements. These results were related reduction amorphous fractions wood, and, consequently,...

Electrical energy storage technologies have become a critical aspect of the whole clean system, which is fundamentally based on batteries. In past decades, innovations in batteries changed appearance our lifestyle with portable devices. More recently, electrical vehicles led mind toward promising world without fossil fuels. However, minimizing weight and/or volume such design driver, and last decade, idea moving electric accumulation inside structural parts has been proposed named (SBs),...

Marine pollution is one of the biggest environmental problems, mainly due to single-use or disposable plastic waste fragmenting into microplastics (MPs) and nanoplastics (NPs) entering oceans from coasts together with human-made MPs. A rapidly growing worry concerning human safety has stimulated research interest in potential risks induced by chemicals associated MPs/NPs. In this framework, present review analyzes recent advances adsorption desorption studies different contaminants species,...

Abstract The propagation of low‐intensity ultrasound in polymers, acting as a high‐frequency dynamic mechanical deformation, can be successfully used to monitor changes the modulus polymers associated with glass transition, crystallization, cross‐linking, and other chemical physical phenomena related viscoelastic behavior, such gelation phenomena. velocity sound is polymer storage density, whereas absorption ultrasonic waves energy dissipation material and, therefore, loss modulus....

Microplastic (MP) pollution represents one of the biggest environmental problems that is further exacerbated by continuous degradation in marine environment MPs to nanoplastics (NPs). The most diffuse plastics oceans are commodity polymers, mainly thermoplastics widely used for packaging, such as polyethylene terephthalate (PET). However, huge interest chemical vector role micro/nanoplastics, their fate and negative effects on human health still under discussion research sparse due also...

This work contributes to fill one of the gaps regarding nanoplastic interactions with biological systems by producing polyethylene terephthalate (PET) model nanoplastics, similar those found in marine environment, means a fast top-down approach based on mechanical fragmentation. Their size distribution and morphology were characterized laser diffraction atomic force microscopy (AFM). autofluorescence was studied spectrofluorimetry fluorescence imaging, being key property for evaluation their...

In this work, a potentially economic and environmentally friendly method for the synthesis of bacterial cellulose (BC) by Gluconacetobacter xylinus from biomass containing orange peel extract was evaluated. Orange used as culture medium without any hydrolysis treatment, thus speeding up procedure. The efficacy carbon source compared with that sucrose. formed thicker gels than those using X-ray diffraction (XRD) revealed both high crystallinity index crystallite size BC nanofibers in samples...

Porosity represents a critical issue in composite manufacturing often leading to parts rejection. The aim of this work was develop multiphysic model capable predict the conditions porosity generated by water processed autoclave lamination. developed does not assess void growth phenomenon, as other models literature, but it enables prediction thermodynamic for water-generated porosity, where they could occur and how prevent their presence suitably modifying process parameters. potential...

In this work, the potential of preformed thermoplastic matrix composite tapes for manufacturing pipes by filament winding assisted in situ ultrasonic welding was evaluated. Unidirectional E-glass-reinforcedamorphous poly (ethylene terephthalate) were laid up and consolidated a machine that modified with set-up enabling welding. The obtained specimens characterized means morphological dynamic mechanical analysis as well void content evaluation, order to correlate parameters properties.

Liquid resin infusion processes are becoming attractive for aeronautic applications as an alternative to conventional autoclave-based processes. They still present several challenges, which can be faced only with accurate simulation able optimize the process parameters and replace traditional time-consuming trial-and-error procedures. This paper presents experimentally validated model simulate of aeronautical component by accounting anisotropic permeability reinforcement chemophysical...

Abstract This study enhances the continuous induction welding of unidirectional carbon fiber‐reinforced low‐melt PAEK, addressing challenge posed by anisotropic electrical conductivity fibers, which causes uneven eddy current distribution, inadequate heating, and weak joint strength. A metallic susceptor moving with coil along weld line but not remaining in bonding interface was introduced to selectively heat area, preventing unnecessary matrix melting. Experimental validation Finite Element...

Abstract An overview of the current state art ultrasonic treatment technology applied to polymer melts is presented. The research and technological advancements as development polymeric materials are discussed. analysis progress shows that mechanism effects ultrasound on not fully understood at present. Such lack in understanding could limit use this versatile future applications. Based critical date, some key issues for a deeper chemical physical identified. © 2012 Wiley Periodicals, Inc....