| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1645707 | Materials Letters | 2013 | 4 Pages |
Phenolic cross linked-epoxy resin based shape memory thermoset was realized through ‘click’ chemistry. Towards this, propargylated novolac and bisphenol A (bis azido hydroxy propyl) ether were synthesized and characterized by FTIR and proton NMR. The functionalized resins were co-cured by click reaction between alkyne and azide group under catalyzed and uncatalysed conditions to form triazole networks. The cure reaction centered around 130 °C decreased to 74 °C on catalysis by Cu2l2. The triazole coupled phenolic-epoxy thermoset displayed shape memory properties with high foldability, shape fixity of 99% and shape recovery of 90% at a low transition temperature of 73 °C. The cross-linked matrix was thermally stable upto 250 °C under nitrogen.
Graphical abstractShape memory polymers were derived from phenolic crosslinked epoxy resin via click chemistry. High shape fixity and 90% shape recovery were shown by the crosslinked network at a switching temperature of 73 °C.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► First time reporting the shape memory properties of azide/alkyne click chemistry cured epoxy resin. ► Novolac chemistry has never been introduced for shape memory features. ► Relatively lower temperature curable epoxy resin is achieved by this approach. ► Moreover, a facile approach for incorporating features of novolac resins to epoxy polymers is described.
