Polymers for Advanced Technologies: Processing, Characterization and Applications


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Light curing was performed for 40 s and polymerization shrinkage was evaluated at 5, 10, 40, 60, , and s. The ADF presented lower linear shrinkage than all other RBCs, and restorative bulk-fill composites exhibited an intermediate behavior. Full article. Abstract The capability of Atomic Force Microscopy AFM to characterize composite material interfaces can help in the design of new carbon-based nanocomposites by providing useful information on the structure—property relationship.

In this paper, the potentiality of AFM is explored to investigate the dispersion and [ The capability of Atomic Force Microscopy AFM to characterize composite material interfaces can help in the design of new carbon-based nanocomposites by providing useful information on the structure—property relationship. In this paper, the potentiality of AFM is explored to investigate the dispersion and the morphological features of aeronautical epoxy resins loaded with several carbon nanostructured fillers.

The FTIR results show that, among the examined nanoparticles, exfoliated graphite EG with a predominantly two-dimensional 2D shape favors the hardening process of the epoxy matrix, increasing its reaction rate. A feedback-loop controls the distance between tip and specimen, which is evaluated by a computer and results in a visual picture of the sample topography. Abstract Antimicrobial packaging systems are recognized as effective approaches to prolong food shelf life.

In this context, Bio-based PA11 loaded with a food-grade zeolite were prepared using ball milling technology in the dry state. Zeolite was filled with sodium salicylate, as an antimicrobial agent, [ Antimicrobial packaging systems are recognized as effective approaches to prolong food shelf life. Morphological organization, evaluated using SEM analysis, indicated the homogeneous distribution of the filler within the polymer matrix.

The filler improves the thermal stability of PA11 and mechanical properties, also enhancing its barrier properties against CO 2 and O 2. The elongated form of the zeolite particles, evaluated through SEM analysis, was used to model the permeability data. Abstract Modified crosslinked polyethylene XLPE with appreciably enhanced DC electrical insulation properties has been developed by chemical modification of grafting chloroacetic acid allyl ester CAAE , exploring the trapping mechanism of charge transport inhibition.

The bound state traps deriving from grafted molecule are analyzed by [ Modified crosslinked polyethylene XLPE with appreciably enhanced DC electrical insulation properties has been developed by chemical modification of grafting chloroacetic acid allyl ester CAAE , exploring the trapping mechanism of charge transport inhibition. The bound state traps deriving from grafted molecule are analyzed by first-principles calculations, in combination with the electrical DC conductivity and dielectric breakdown strength experiments to study the underlying mechanism of improving the electrical insulation properties.

The substantial deep traps are generated in XLPE-graft-CAAE molecules by polar group of grafted CAAE and accordingly decrease charge mobility and raise charge injection barrier, consequently suppressing space charge accumulation and charge carrier transport. The well agreement of experiments and quantum mechanics calculations suggests a prospective material modification strategy for achieving high-voltage polymer dielectric materials without nanotechnology difficulties as for nanodielectrics. The highest occupied molecular orbital HOMO is referenced as energy zero and smearing is 0.

Abstract Adhesion of cords to elastomers is crucial for many elastomeric products, such as tires and V-belts. The best adhesion system so far is based on a combination of resorcinol, formaldehyde, and a latex RFL.


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However, this cord treatment has serious disadvantages in terms [ Adhesion of cords to elastomers is crucial for many elastomeric products, such as tires and V-belts. However, this cord treatment has serious disadvantages in terms of processing and toxicity. A promising alternative is a plasma treatment of the cords prior to be embedded in the elastomer. For rayon cords, a plasma polymerization of sulfur-containing precursors results in adhesion levels close to RFL treatment.

However, for polyethylene terephthalate PET cords, this treatment is not satisfactory. For rayon, an even higher adhesion level was realized. Abstract This work is aimed at studying the suitability of ultra-high molecular weight polyethylene UHMWPE fibers for the production of polyethylene homo-composites processed by rotational molding. This work is aimed at studying the suitability of ultra-high molecular weight polyethylene UHMWPE fibers for the production of polyethylene homo-composites processed by rotational molding. A preliminary screening of different processing routes for the production of homo-composite reinforcing bars was performed, highlighting the relevance of fiber impregnation and crystalline structure on the mechanical properties.

A combination of co-extrusion and compression molding was found to optimize the mechanical properties of the reinforcing bars, which were incorporated in the LLDPE matrix during a standard rotational molding process. Apart from fiber placement and an increase in processing time, processing of homo-composites did not require any modification of the existing production procedures. Plate bending tests performed on rotational molded homo-composites showed a modulus increase to a value three times higher than that of neat LLDPE.

What is POLYMER ENGINEERING? What does POLYMER ENGINEERING mean? POLYMER ENGINEERING meaning

Abstract Wall slip in the flow of powder injection molding PIM compounds can be the cause of unrealistically low viscosity values, and can lead to a failure of flow simulation approaches. Regardless of its importance, it has been considered only scarcely in the rheological [ Wall slip in the flow of powder injection molding PIM compounds can be the cause of unrealistically low viscosity values, and can lead to a failure of flow simulation approaches. Regardless of its importance, it has been considered only scarcely in the rheological models applied to PIM materials.

In this paper, an online extrusion rheometer equipped with rectangular slit dies was used to evaluate the slip velocity of commercial as well as in-house-prepared PIM feedstocks based on metallic and ceramic powders at close-to-processing conditions. The tested slit dies varied in their dimensions and surface roughness. The wall-slip effect was quantified using the Mooney analysis of slip velocities. The smaller gap height 1 mm supported the wall-slip effect.

It was shown that both the binder composition and the powder characteristic affect slip velocity.


  • by Apple Academic Press.
  • Department of Polymer and Process Engineering,Indian Institue of Technology Roorkee?
  • Reviewed Publications (251):.
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  • Slip velocity can be reduced by tailoring a powder particle size distribution towards smaller particle fractions. The thickness of the polymer layer formed at the channel wall is higher for water-soluble feedstocks, while in the case of the catalytic polyacetal feedstocks the effect of surface roughness was manifested through lower viscosity at smooth surfaces. Abstract In this study we present polymeric microneedles composed of multiple layers to control drug release kinetics.

    Layered microneedles were fabricated by spraying poly lactic- co -glycolic acid PLGA and polyvinylpyrrolidone PVP in sequence, and were characterized by mechanical testing and ex vivo skin insertion [ In this study we present polymeric microneedles composed of multiple layers to control drug release kinetics. Layered microneedles were fabricated by spraying poly lactic- co -glycolic acid PLGA and polyvinylpyrrolidone PVP in sequence, and were characterized by mechanical testing and ex vivo skin insertion tests. Histological examination confirmed that the microneedles were successfully inserted into the skin and indicated biphasic release of dyes incorporated within microneedle matrices.

    The results showed that the tertiary structure of BSA was well maintained in both PLGA and PVP layers while the secondary structures were slightly changed during microneedle fabrication. The blank PLGA layer acted as a diffusion barrier, resulting in a reduced initial burst.

    The formation of the PLGA diffusion barrier was visualized using confocal microscopy.

    Our results suggest that the spray-formed multilayer microneedles could be an attractive transdermal drug delivery system that is capable of modulating a drug release profile. Once inserted, the microneedle would be embedded in the skin due to dissolution of water-soluble polymers, and rapidly release drugs incorporated in a water-soluble matrix. Biodegradable tips would remain in the skin, releasing drugs for an extended period of time. Abstract One of the fundamental issues in the Fused Filament Fabrication FFF additive manufacturing process lies in the mechanical property anisotropy where the strength of the FFF-3D printed part in the build-direction can be significantly lower than that in other directions.

    The physical phenomenon [ One of the fundamental issues in the Fused Filament Fabrication FFF additive manufacturing process lies in the mechanical property anisotropy where the strength of the FFF-3D printed part in the build-direction can be significantly lower than that in other directions. The physical phenomenon that governs this issue is the coupled effect of macroscopic thermal mechanical issues associated with the thermal history of the interface, and the microscopic effect of the polymer microstructure and mass transfer across interfaces.

    In this study it was found that the use of This increase in the interlayer adhesion strength is attributed to the increase in polymer reptation due to ultrasonic vibration-induced relaxation of the polymer chains from secondary interactions in the interface regions.

    Polymers for Advanced Technologies

    The errors bar represent the standard deviation measured at four sections for each given track width. The error bar represents the standard deviation of adhesion strength measured for four test specimens at a given track width, both in control and ultrasound condition. Marasso , Matteo Cocuzza and Francesco Perrucci. Abstract Stereolithography 3D printing is today recognized as an effective rapid prototyping technique in the field of polymeric materials, which represents both the strengths and the weaknesses of this technique.

    The strengths relate to their easy handling and the low energy required for processing, [ Stereolithography 3D printing is today recognized as an effective rapid prototyping technique in the field of polymeric materials, which represents both the strengths and the weaknesses of this technique. The strengths relate to their easy handling and the low energy required for processing, which allow for the production of structures down to the sub-micrometric scale.

    The weaknesses are a result of the relatively poor mechanical properties. Unfortunately, the choice of the right material is not sufficient, as the printing parameters also play a crucial role. For this reason, it is important to deepen and clarify the effect of different printing conditions on final product characteristics. In this paper, the behavior of commercial Standard Blend ST Blend acrylic resin printed with stereolithography SL apparatus is reported, investigating the influence of printing parameters on both the tensile properties of the printed parts and the build accuracy.

    Twenty-four samples were printed under different printing conditions, then dimensional analyses and tensile tests were performed. It was possible to find out the optimum printing setup to obtain the best result in terms of mechanical resistance and printing accuracy for this kind of resin.

    VKcp | Department of Chemical Engineering

    Finally, a micrometric spring was printed under the optimal conditions to demonstrate the possibility of printing accurate and tiny parts with the commercial and inexpensive STBlend resin. Dimension is expressed in mm. On the y axis, the same 2. When the membrane forming temperature was higher than the LCST, membrane formation mechanism was controlled by non-solvent assisted RTIPS process and the also membranes presented a more porous structure on the surface and a bi-continuous structure on the cross section.

    Graphical abstract

    The advantages of the SPES additive are reflected by the relatively high flux, good hydrophilicity and excellent mechanical properties at 0. Profiles are shifted for the purpose of clarity. Abstract Poly 4-styrenesulfonate -conducting polymer PSS-CP is advantageous for thin-film electrode manufacturing due to its high conductivity, high charge storage, structural stability, and excellent ink dispersion. Poly 4-styrenesulfonate -conducting polymer PSS-CP is advantageous for thin-film electrode manufacturing due to its high conductivity, high charge storage, structural stability, and excellent ink dispersion.

    PPy:PSS can be easily prepared using a simple solution process that enables the mass production of thin-film electrodes with improved electrical and electrochemical properties. This work provides an efficient approach for producing cost-effective and miniaturized supercapacitors with high conductivity and high specific capacitance for practical applications in a variety of electronic devices. To realize the practicability and stability in actual industrial processing, this paper is aimed at studying the improvement mechanism of ultrasonic vibration on the molding [ To realize the practicability and stability in actual industrial processing, this paper is aimed at studying the improvement mechanism of ultrasonic vibration on the molding quality.

    The melt-filling process in the micro-needle array cavity is simulated, and the improvement effect of ultrasonic vibration is discussed. The enhancement effect of ultrasonic vibration on material properties of polypropylene and polymethylmethacrylate parts are experimentally investigated. Material properties of both the semi-crystalline polymer and amorphous polymer could be enhanced by the transformation of micromorphology. It is proved that for a semi-crystalline polymer, this novel method could be employed as a material properties enhancement method, and an optimal excitation voltage of ultrasonic vibration is obtained to achieve the best material properties.

    Abstract The use of commodity polymers such as polypropylene PP is key to open new market segments and applications for the additive manufacturing industry. Technologies such as powder-bed fusion PBF can process PP powder; however, much is still to learn concerning process parameters for [ The use of commodity polymers such as polypropylene PP is key to open new market segments and applications for the additive manufacturing industry. Technologies such as powder-bed fusion PBF can process PP powder; however, much is still to learn concerning process parameters for reliable manufacturing.

    The research presents an overview of the intrinsic and the extrinsic characteristic of a commercial PP powder as well as fabrication of tensile specimens with varying process parameters to characterize tensile, elongation at break, and porosity properties. The impact of key process parameters, such as power and scanning speed, are systematically modified in a controlled design of experiment. The results were compared to the existing body of knowledge; the outcome is to present a process window and optimal process parameters for industrial use of PP.

    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications
    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications
    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications
    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications
    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications
    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications
    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications
    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications
    Polymers for Advanced Technologies: Processing, Characterization and Applications Polymers for Advanced Technologies: Processing, Characterization and Applications

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