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B-staging is a process that utilizes heat or UV light to remove the majority of solvent from an adhesive, thereby allowing a construction to be “staged”.In between adhesive application, assembly and curing, the product can be held for a period of time, without sacrificing performance.
The variation of G' and G" in time can indicate the extent of the curing reaction. [7] As shown in Figure 4, after an "induction time", G' and G" start to increase, with an abrupt change in slope. At a certain point they cross each other; afterwards, the rates of G' and G" decrease, and the moduli tend to a plateau.
J-B Weld (stylized as J-B WELD) is the name of their flagship product: a specialized, high-temperature epoxy adhesive for use in bonding materials together. The company has run advertisements showing engine block repair with J-B Weld. [2] The J-B Weld Company, founded in 1969 by Sam Bonham in Sulphur Springs, Texas, specializes in epoxy products.
Significant advances in understanding yellowing of epoxies were achieved by Down first in 1984 (natural dark aging) [44] and later in 1986 (high-intensity light aging). [45] Down investigated various room-temperature-cure epoxy resin adhesives suitable for use in glass conservation, testing their tendency to yellow.
As reaction proceeds, larger and larger molecules are formed and highly branched crosslinked structures develop, the rate of cure being influenced by the physical form and functionality of epoxy resins and curing agents [3] – elevated temperature postcuring induces secondary crosslinking of backbone hydroxyl functionality which condense to ...
The test complements the measurement of glass transition temperature, as an indirect measure of the degree of cure of a composite. It is inexpensive and quick, and provides information on the cure throughout a part. [1]
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Pre-preg also allows one to impregnate a bulk amount of fiber and then store it in a cooled area (below 20 °C) for an extended period of time to cure later. The process can also be time consuming in comparison to the hot injection process and the added value for pre-preg preparation is at the stage of the material supplier.