Adjustable amine-epoxy composition in a stratified thin film with a spin-coating process: A useful tool for establishing relationships between the local glass-transition temperature at the interface and the network structure

作者：Carriere Pascal^*; Onard Sandra; Martin Isabelle; Chailan Jean Francois

来源：Journal of Applied Polymer Science, 2015, 132(25): 42078.

DOI：10.1002/app.42078

• coatings
• crosslinking
• glass transition
• properties and characterization
• thermosets

An easy method for preparing supported homogeneous epoxy-amine thin films on a silica surface consisting of two distinct layers was developed via spin coating from epoxy-amine solutions. Because of these two layers had the controlled properties of the upper layer, we showed that it was possible to precisely control the epoxy-amine stoichiometry in the sublayer through the initial epoxy-amine ratio, the spin-cast process, and the overall film thickness. First, in the thin films, the primary amine-epoxy conversion was constant, whatever the thickness and initial epoxy-amine stoichiometry for a given curing schedule. As the primary amine conversion can be independently tuned in thin films, it thus provided a rather unique and easy method for better understanding the relationship between the network structure curing at the interface and the resulting properties, such as the glass-transition temperature (T-g) and elastic modulus. Here, we also showed that we could access the local T-g; this implied a potential application of these experimental data in predictive composite material properties.

• 出版日期2015-7-5