Combined Cure Paths

The ratio of the retention of aromatic and hydroxyl absorptions after extensive acetone extraction was similar for different compound compositions cured during different time intervals. Thus, it was concluded that BHT fragments were not bound via EPDM macroradical phenoxy radical combination reactions, leaving combination via EPDM macroradicals and benzylic radicals as the most likely reaction path. In conclusion, it was stated that about 25% to 30% of the BHT became chemically bound, which was further supported by results of ageing experiments using cured samples that had been extensively extracted. 

The Maleimide cure system is similar to the sulfur donor system in that it involves the decomposition of the sulfonyl chloride cure site. In this case, however, the Maleimide (meta-toluene-bis-maleimide, HVA-1 or meta-phenylene-bis-maleimide, HVA-2) rather than sulfur, is involved in the cross-links, and there is no evidence of a metal ionic bond. The reaction is usually initiated with an amine involving either an amine-catalyzed decomposition of the sulfonyl chloride group or a path of radical anions. The most recently developed initiators, which have been found to give a balanced combination of... 

So it is not surprising to find the same adhesive being described as a RT curing two-part epoxy, as a metal bonding paste adhesive, Araldite 2015, or some other combination. Indeed it may well be that the standard titles do not convey or assist with the specific nature of the application in mind. Such a situation has the potential to make selection of the correct adhesive for the task in hand a potentially challenging activity. However, if the user follows a logical set of choice paths, then the task can be simplified considerably, O Pi. 16.1. Key factors to consider include ... 

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