期刊导航

Totally found 4 items.

  • [会议] Elastomeric Bio-based Epoxy / Clay Nanocomposites
    The emphasis of this research was to develop a fully bio-based elastomeric epoxy and its clay nanocomposites. Blends of sorbitol glycidyl ether (SGE) and epoxidized castor oil (ECO) were cross-linked with a dimer diamine (DDA) as curing agent in a solvent-free procedure. Blends of SGE and ECO (0/100, 30/70, 50/50, 70/30 and 90/10, w/w) were cured with stoichiometric amounts of DDA alone or following the addition of 5 wt% of one of two organically modified montmorillonite (OMMT) nanoclays, Cloisite 20A and 30B. Pure SGE was immiscible with DDA at room temperature, but SGE/ECO blends were compatible with DDA. All networks were cured at 60℃ for 6 hours, with crosslinking kinetics monitored via near-infrared (NIR) spectroscopy. Epoxy conversion increased with increasing ECO content due to improved compatibility with DDA. The greatest concentration of unreacted primary and secondary amine groups was observed in the 90/10 SGE/ECO blend. Nanoclay dispersion and affinity for the matrix was assessed via x-ray diffraction (XRD), and an intercalated structure was confirmed regardless of nanoclay type or epoxy formulation. Mechanical properties were also investigated. A broad range of Young's Moduli (~0.7-4.8 MPa) and hardness values (30-81 Shore A) were obtained, with the highest stiffness and hardness observed in the 90/10 SGE/ECO / 5 wt% Cloisite 30B nanocomposite. Indeed, these results support the existence of a synergistic effect on mechanical properties due to nanoclay addition, thanks both to increased chemical crosslink density and nanofiller reinforcement. Based on these studies, SGE/ECO/DDA clay nanocomposites show promise as versatile elastomeric networks whose hydrophobicity and mechanical properties may be adjusted for a range of industrial applications.
    关键词: bio-based;elastomeric;clay;nanocomposite
  • [会议] Investigation on the Influence of Multi-step Processing on the Mechanical and Thermal Properties of Cellulose Reinforced EVOH Composites
    The industrial fabrication of thermoplastic composites involves the consecutive application of different melt processing techniques such as extrusion and compression moulding. In the course of processing, the material properties can undergo significant changes that determine the final properties of the product. Thermoplastic composites created by implementing cellulose - a relatively low cost, bio-renewable and bio-degradable polymer with high mechanical properties and low density - as a filler show promising results. In order to establish a cost-efficient, scalable and sustainable production in industry it is important to understand how melt processing affects the mechanical and thermal properties of cellulose thermoplastic composites. Microcrystalline cellulose (MCC) and cellulose nanocrystals (CNC) were combined, in tum, with ethylene vinyl alcohol (EVOH) using a high shear screw configuration for extrusion to create composites with improved dispersion. Melt processing steps included compounding in the extruder followed by compression moulding. No thermal degradation was found in the course of processing. Results revealed an elevated crystallization temperature for composites due to a nucleating effect of cellulose. When the compression moulding step was repeated, a processing-induced orientation led to an increase in crystallinity which is higher in pristine material as strong filler-matrix interaction inhibits molecular movement in composites.
    关键词: processing;cellulose;thermoplastic composites;crystallization;nucleating effect
  • [会议] Evaluation of Electro-spun Polymeric Nanofibers for Sound Absorption Applications
    The electro spinning process was used to manufacture nanofiber mats of polymeric materials that have low thickness and improved sound absorption characteristics. The processed nanofiber composites consisted of a number of formulated combinations of polymeric materials, i.e., Polyvinyl Alcohol (PVA), Polystyrene (PS), and Polyvinyl Chloride (PVC). These materials were further modified by addition of fillers like Carbon nanotubes (CNTs), Graphene (GN), Wollastonite (WS) and Fiberglass (FG) for the purpose of betterment of their soundproofing characteristics. This paper focuses on an experimental study for evaluating the sound absorption coefficient of these composites by implementing the standard test method of sound absorption using an impedance tube. The effects of back cavity, air gaps, layering and graded thickness of different combination of the produced nanofiber mats were also investigated in this study. The experimental results revealed that these nanofiber mats demonstrate good sound absorption potential in low and medium frequency ranges (Up to 2000Hz). These cost-effective nanofiber mats have the potential of being used as sound barriers, to reduce noise transmission and keep it contained and/or as sound-dampening and sound-deadening materials in applications where space and volume savings are critical, especially in the electronic and aerospace industries.
    关键词: Electrospinning;Sound absorption;Noise control;Nanofiber composite
  • [会议] Synthesis of Novel Polymer Nanocomposite for Water-based Drilling Fluids
    The Polymer nanocomposite have fascinated the strong interest due to its capitative properties and potential use for smart drilling fluids in the petroleum industry. Water based drilling fluids are employed for drilling oil and gas wells to extract hydrocarbons from reservoirs. The formulation of drilling fluid includes various additives to control rheological and filtration properties. For this purpose, a novel associative hydrophobic polymer-based nanocomposite was synthesized using functionalized carbon nanotubes, acrylamide, maleic acid and 2-Acrylamido-2-methylpropane sulfonic acid via solution polymerization technique. The chemical structure of novel polymer nanocomposite was characterized with Fourier transform spectroscopy to confirm the presence of covalent bond (ester linkage) between hydroxyl group from functionalized carbon nanotubes and carboxylic group from malic acid. The rheological properties were evaluated by mixing appropriate amount of polymer nanocomposite with base drilling fluid (modified drilling fluids) at 25℃. The steady shear rheology experiments showed that increasing the concentration polymer nanocomposite in the base drilling fluid resulted in significant increase in viscosity, shear stress and gel strength of modified drilling fluid. The dynamic rheological experiments of polymer nanocomposite were also performed with two different concentration in the base drilling fluid to access the viscoelastic properties. The synthesized polymer nanocomposite can be used as one of the additives in water-based drilling fluids to modify rheological.
    关键词: Synthesis;Novel Polymer Nanocomposite;Water-based Drilling Fluids
意见反馈
返回顶部