coupling agent


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coupling agent

[′kəp·liŋ ‚ā·jənt]
(chemistry)
A substance that can react with both reinforcement and matrix components of a composite material to form a binding link at their interface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Silorane composite overall showed better shear bond strength and can be used with Methacrylate based composites in repair options using silane coupling agent and its silorane adhesive bond.
In the presence of water, the alkoxy group of silane coupling agent is hydrolyzed to silanol (-Si-OH), which is the active species in bonding to glass filler or fiber [2, 21-24].
Composite was also fabricated through melt mixing of PVC, wood flour and coupling agent using internal mixer.
It could also be due to attachment of the silane coupling agent solely on the fiber surface.
The variation of tensile strength and modulus of rPP/MCC composites with and without MAPP coupling agent are depicted in Figure 1.
The selection of a proper coupling agent is important in prolonging longevity of the composite.
Figure 1 shows the variation of surface free energy of sepiolite nanofibers after modification with different coupling agent addition ([gamma]-(2,3-epoxypropoxy)propyltrimethoxysilane) amounts.
Surface hydroxyl number and modification degree of amorphous silica modified with silane coupling agent
The acetone solution containing a silicone coupling agent, along with a certain quantity of tetrapod-like nano-ZnO whiskers, was dispersed ultrasonically using a KQ-100 ultrasonic instrument and then dried with an electro-thermal vacuum oven after filtration.
Creating exterior durable bonds to wood using epoxy adhesives or other nonaqueous adhesives often requires the application of a primer or coupling agent. For durable wood-to-wood and wood-to-fiber-reinforced-polymer (FRP) bonding, the use of a hydroxymethylated resorcinol (HMR) coupling agent is recommended as a primer.
This latter phase develops as a result of the dual reactivity of a silane coupling agent, (YRSi[X.sub.3]), a bifunctional molecule capable of reacting with the silanol groups of glass or ceramic fillers via its silane functional group (-Si[X.sub.3]) to form Si-O-Si- bonds to filler surfaces, and also with the resin phase by graft copolymerization via its Y functional group, usually a methacrylic vinyl group.
Polymers do not usually adhere to glass, but combining glass and polymer to create composite materials is possible if an intermediary polymer coupling agent is used as a go-between, according to Penn State scientists.