View source for BT-Epoxy

{{Short description|Polymer used in printed circuit boards}}
{{Noref|date=June 2023}}
'''BT-Epoxy''' ('''BT''' short for [[Bismaleimide]]-[[Triazine]] resin) is one of a number of thermoset [[resin]]s used in [[printed circuit board]]s (PCBs). It is a mixture of [[epoxy resin]], a common raw material for PCBs and BT resins. This is in turn a mixture of bismaleimide, which is also used as a raw material for PCBs and [[cyanate ester]]. Three cyano groups of the cyanate ester are [[trimer (chemistry)|trimer]]ized to a triazine ring structure, hence the T in the name. In presence of a bismaleimide, the double bond of the maleimide group can [[copolymer]]ize with the [[cyano group]]s to [[heterocyclic]] 6-membered [[aromatic ring]] structures with two nitrogen atoms ([[pyrimidine]]s). The cure reaction occurs at temperatures up to {{Convert|250|C|F|abbr=on}}, and is catalyzed by strongly basic molecules like Dabco ([[DABCO|diazabicyclooctane]]) and [[4-DAMP|4-DMAP]] (4-dimethylaminopyridin). Products with very high [[glass transition temperature]]s (T<sub>g</sub>) up to {{Convert|300|C|F|abbr=on}} and very low dielectric constant can be obtained. These properties make these materials very attractive for use in PCBs, which are often subjected to such conditions.

== See also ==

* [[Printed circuit board]]
* [[Synthetic resin]]
* [[Epoxy]]
* {{Section_link|Electronics industry|Manufacturing}}

== References ==
<references />

[[Category:Synthetic resins]]


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