An investigation on shape memory behaviors of epoxy resin system

Abstract

Shape-memory epoxy is receiving considerable attention because of its superior mechanical and thermal properties and excellent shape-memory performance. In this study, a novel series of shape-memory epoxy resins are prepared using hydro-epoxy, hexahydrophthalic anhydride, and diglycidyl 4,5-epoxy tetrahydro phthalate (TDE-85) to further improve the recovery force of shape-memory epoxy resins. The thermal, mechanical, and shape-memory properties of the shape-memory epoxy resin system are investigated by differential scanning calorimetry, dynamic mechanical analysis, bend test, and shape recovery test. Results indicate that the glass transition temperature (T g ), rubber modulus, and room-temperature bend strength increase as TDE-85 content increases. Investigation of the shape-memory behavior of the resin reveals that full recovery can be achieved after only several minutes when the temperature is equal to or above T g . The shape recovery time decreases with the increase in TDE-85 content at T g , T g 1 10°C, and T g 1 20°C. These results are attributed to the increase in TDE-85 content.

Shape Memory Epoxy Resin and Its Composites: From Materials to Applications

“…The T g of SMEP decreases from 110°C to 50°C, and the crosslink density decreases. Subsequently, they prepared a series of new SMEPs using hydrogen epoxy, MMHPA, and diglycidyl 4,5-epoxy tetrahydro phthalate (TDE-85) [ 68 ]. They then prepared a series of SMEPs with tetraposensitive epoxy monomer (AG-80) and glutaric anhydride [ 69 ].…”

The cooperative effect of short-cut carbon fiber and carbon black on the performance of electric-driven morphing skins

“…Once heated above its glass transition temperature (Tg), SMP skin transfer to soft and rubbery state, which can morph to a new shape. [10][11][12] Adjusted by the temperature rise and fall, SMP skin can change it state from glassy to rubbery reversible, making morphing skins have variable stiffness, wide deformation range, and strong adaptability. It has been reported that SMP skin could be strain to 200% elongation.…”

Effects of networks composed of epoxy/dual thiol‐curing agents on properties of shape memory polymers

“…This memory characteristic enables polymers to form a permanent shape and then transformed to another temporary shape under external force. Some certain stimuli (e.g., electric, heat, magnetic field, and heat) will lead to a shape transformation from temporary to permanent, just like “switch” 1,4,5 . Various types of stimuli sensitive SMPs have been developed to meet work requirements and present great application potential in many fields, such as aerospace, medicine, and electronics 6–9 …”