Journal
POLYMERS
Volume 10, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/polym10050504
Keywords
epoxy resin; polyester polyurethane; Diels-Alder adduct; polycaprolactone; co-network; shape recovery; stress-strain behavior; modeling
Categories
Funding
- European Regional Development Fund
- European Union
- [GINOP-2.3.3-15-2016-00021]
- [GINOP-2.3.2-15-2016-00041]
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The present work aimed at the preparation and investigation of different epoxy-polyurethane (EP-PU) co-networks. The EP-PU co-networks were obtained by applying two different synthetic strategies, in which the coupling element, the Diels-Alder (DA) adduct, was prepared previously or formed in situ in the reaction between furan functionalized polyurethane and furfuryl amine-diglycidyl ether bisphenol-A oligomers (FA_DGEBA). For the synthesis of these EP-PU networks, poly(epsilon-caprolactone)-diol (PCD, M-n = 2 kg/mol) and poly(epsilon-caprolactone) (PCL) with different molecular weights (M-n = 10, 25 and 50 kg/mol) and 1,6-hexamethylenediisocyanate (HDI) were used. The EP-PU co-networks were characterized by Attenuated Total Reflectance Fourier-Transform Infrared spectroscopy (AT-FT-IR), differential scanning calorimetry (DSC) and dynamical mechanical analysis (DMA). Scanning electron microscopy (SEM) was applied to assess the morphology of the EP-PU samples. It was demonstrated that the stress-strain curves for the EP-PUs could be interpreted based on the Standard Linear Solid (SLS) model. The DMA traces of some EP-PUs (depending on the composition and the synthetic method) revealed a plateau-like region above the melting temperature (T-m) of PCL confirming the presence of cross-linked structure. This feature predicted shape memory (SM) behavior for these EP-PU samples. Indeed, very good shape fixity and moderate shape recovery were obtained. The shape recovery processes of these EP-PU samples were described using double exponential decay functions.
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