The interdependency of epoxy system’s network formation, morphologies, and end properties remains undetermined due to a lack of understanding of primary and secondary amine reactivities. This is impeding the usage of cure path optimization for improving part performance and cost. In the subsequent work,With this motivation, systems consisting of the difunctional epoxide monomer diglycidyl ether of bisphenol F (DGEBF), the tetra functional epoxide monomer tetraglycidyl 4,4’-diaminodiphenylmethane (TGDDM), and a mixture of the two crosslinked with the diamine curing agent 4,4’-diaminodiphenylsulphone (44DDS) all in a stoichiometric epoxide to reactive proton ratio were investigated. were studied in order to begin understanding the different reactivities elicited effect. Standard activation energy (E<sub>a</sub>) calculations were performed using differential scanning calorimetry (DSC) <i>via</i> the Flynn-Wall-Ozawa method (FWO). However, DSC yields a wholistic view of the cure taking place, lending no insight into specific reactionsmolecular conversion. Therefore, corroborative experiments were performed in-situ through near infrared (NIR) spectroscopy to yield detailed information on the individaual reactions taking place. Then Nthe anoscale morphology analysis were done ies were studied through atomic force microscopy (AFM), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM). The morphology was correlated with chemical mapping through nanoscale IR analysis (AFM-IR). Peak force AFM was used for local mechanical mapping of the surfaces. This work illustrates the critical role that chemical composition and processing pathways have on network structures and local properties.

Determining amine reactivities effect on epoxy network formation: Influence of chemical structure and processing conditions on local properties

2019 Spring National Meeting

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