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Showing 1 to 20 of 30 for “"coupling agents"”.
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INELASTIC ELECTRON TUNNELLING SPECTROSCOPY (lETS) OF SILANE COUPLING AGENTS
… has been used to study monolayers of silane coupling agents adsorbed on aluminium oxide. The technique of lETS is surface specific and uses electrons to excite vibrational modes of the adsorbate. Since the tunnelling electrons perturb both the dipole moments and polarizability ellipsoids of …
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Creation of crosslinkable interphases in polymer blends by means of novel coupling agents
… of the blend properties. For this purpose novel coupling agents (named SCA) containing 2-oxazoline, 2-oxazinone, and hydrosilane reactive sites have been prepared. In blends of amino- functional and carboxylic acid terminated polymers the oxazoline and oxazinone units of the SCA react selectively …
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New Segmented Block Copolymers Based on Hard and Soft Segments Using Selectively Reacting Bifunctional Coupling Agents
… using novel selectively reacting bi-functional coupling agents which have recently been developed by Jakisch at al. Both couplers have one oxazoline group that reacts with carboxylic groups and one oxazinone group that reacts with hydroxyl or amino groups. It was intended to synthesize segmented …
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Investigation on jute fibres and their composites based on polypropylene and epoxy matrices
… composites, including: NaOH treatment, silane coupling agents, epoxy dispersion and their combinations - Investigation the influence of modification on the performance of jute fibre and jute compostites.
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Fundamental Importance of Fillers, Cure Condition, and Crosslink Density on Model Epoxy Properties
… (APDS) and 3-aminopropyltriethoxysilane (APTS) coupling agents. The filler and coupling agents decreased the mobility of the polymer chains in the vicinity of the filler leading to an increase in the activation energy for the glass transition and an increase in cooperativity. Fumed silica did …
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Evaluation of fiber-matrix interfacial shear strength in fiber reinforced plastics
… polyester matrix polymers with and without added coupling agents, as well as four fiber surface modifications. Different coupling agents on the fibers were shown to change the fiber tensile strength markedly. Filament wound unidirectional composites were tested in short beam "shear." Corresponding …
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Design of Improved Ceramic/polymeric Composites
… the design, fabrication, and evaluation of a new coupling agent for glass fiber/epoxy matrix composites. This interface consisted of a thin coating of activated carbon (ACI) with high surface area to take advantage of mechanical interlocking. Furthermore, the surface chemistry was modified to …
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Modification of Wood Fiber with Thermoplastics by Reactive Steam-Explosion
… for wood-thermoplastic composites without a coupling agent. Traditional studies have addressed the improvement of adhesion between components of wood thermoplastic composites through the use of coupling agents such as maleated PO. The objective of this study was to increase adhesion between …
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New polymeric biomaterial interfaces for biosensor applications
… to the graft copolymer by introducing proper coupling agents. Arrays of proteins were produced by either simple adsorption or coupling of proteins onto the graft copolymer patterned surfaces. The protein arrays were utilized as templates in fabricating cellular arrays of non-adherent B cells.
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Synthesis and biological evaluation of functionalized benzoxaboroles as potential antimicrobial agents
… and materials chemistry, and also as cross-coupling agents in synthetic chemistry. Boronic acids often function as inhibitors for various enzymes due to their unique electronic and physicochemical properties. B-hydroxy-1,2-oxaborolanes (benzoboroxoles) are a class of cyclic boronic acid …
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Characterisation and refinement of properties of glass fibre reinforced polyester polymer concrete for use in manhole components
… evaluated. The viability of employing silane coupling agents in polymer concrete was investigated in detail towards the end of the research. Redesign of the Type 2A replacement cover was then undertaken.
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Investigation of Waterborne Epoxies for E-Glass Composites
… glass composite. The additional constraining and coupling of the E-glass fibers to the segmental motion of the epoxy matrix results in an increased level of viscoelastic cooperativity. Current research has determined that the cooperativity of an epoxy/E-glass composite is also sensitive to the …
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A DIGITAL DATA ACQUISITION SYSTEM FOR INELASTIC ELECTRON TUNNELLING SPECTROSCOPY
… adhesives (CH2C(CN)COOR) (ii) alkoxysilane coupling agents (RSi(OR’)3) on aluminium oxide. High-quality tunnel spectra are presented and assigned. Evidence suggests that a-cyanoacrylates adsorb through formation of carbonyl - surface hydroxyl hydrogen bonds, conventional polymerisation …
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Photocrosslinkable polyimide and poly(imide siloxane) homo- and copolymers: synthesis and characterization
… percent, eliminated the need for conventional coupling agents.
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Improvement in Adhesion for the Epoxy-SiC System via Plasma and Silane Surface Modification Techniques
… and surface derivatization using silane coupling agents as surface modification techniques in an effort to enhance the adhesive bonding of epoxy to SiC coated Si wafers (SiC/Si). Durability was evaluated by immersing coated-Si samples in aqueous solutions at elevated temperature (60°C) to …
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Zero length crosslinking of bovine carbonic anhydrase II and chondroitin-4-sulfate
… and N-hydroxysuccinimide as coupling agents. The complex remained enzymatically active, was water soluble, and appeared to be about 170 kDa as analyzed on SDS-PAGE and column chromatography on Sephadex G 150. It is likely that 5 protein molecules (30 kDa each) are linked to 1 …
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Silica Dispersion for Applications in Rubber Processing
… made possible through treatment of the silica by coupling agents (CA) such as bi-functional alkoxysilane molecules. The CA chemically binds to surface silanol groups so that interparticle and particle-polymer interactions are modified in a manner that improves the silica dispersion quality as well …
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High elastic modulus nanopowder reinforced resin composites for dental applications
… (TEGDMA) monomers. Surfactants, silanizing agents and primers are examined to obtain higher filler levels and enhance the bonding between filler and matrix. Silane agents work best. The elastic modulus of a 57.5 vol% alumina/resin composite is 31.5 GPa compared to current commercial resin …
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The influence of ‘nanocluster’ reinforcement on the mechanical properties of a resin-based composite material
… further development of hydrophilic silane coupling agents and resin monomers is required to realize these properties.
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