What additive to bismaleimide resins could most effectively improve the impact strength of the entire composition ???
In addition to my question:
Most commonly - epoxy resins are used (blended with) to improve the impact strength of bismaleimide-based composition. So, - it's a well-known way.
BUT my question is targeted some new less-known ways to solve the above-mentioned problem.
Leonid
One strategy is to use thermoplastic materials as impact modifiers. Polyetherimide and polyarylenetherketone are used in most cases, but also ABS if it is possible to sacrify some of the heat stability. New would be to used polyphenylene ether (PPE or PPO) as additive. For adding a thermoplastic material it is advantageously if it is soluble in DMF or NMP to be mixed with the solution of BMI and o,o-diallyl-BPA. But perhaps also PPS powder can be used if the curing temperature is raised in a last step over the melting point of PPS (270°C). Another strategy is to broaden the network. Many work was done to make bismaleinimides with more aromatic rings between the both bismaleinimide groups. This strategie is also possible with the diallylbisphenol if e.g. CAS[128481-70-9] is used (3-nucleus o,o-diallyl bisphenol ). Also monofunctional monomers like phenylmaleinimide, o-allylphenol, eugenol, n-vinyl imidazole, n-vinyl pyrrolidone, vinylpyridine or styrene can braoden the network (under sacrifying some of the Tg).
please check it
www.google.co.in/patents/US5648407
www.google.com/patents/US20140348776
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