Synthesis and thermomechanical research of shape memory epoxy systems

Song, Weibin; Wang, L.Y.; Wang, Z.D.

doi:10.1016/j.msea.2011.08.049

Cited by 49 publications

(16 citation statements)

References 24 publications

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“…This can be explained by the fact that at these temperatures, large-scale conformational changes are impossible for polymers and only local conformational changes are allowed. Thus, the stiffness of the material is high and the storage modulus is important [44]. In the temperature ranges from 140 to 240°C, the sample DGEBA/33′ DDS shows a slight increase of storage modulus which various from 1.87×10 7 to 2.07×10 7 Pa.…”

Section: Dmta Resultsmentioning

confidence: 99%

Exploring the structural properties and enhancement of Opto-electrical investigations for the synthesized epoxy based polymers with local nanoscale structures

Jilani

Fourati

Zerrouki

et al. 2020

Mater. Res. Express

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Epoxy networks of the diglycidyl ether of bisphenol A (DGEBA) were prepared using 4, 4′diaminodiphenyl (44′DDS) and 3, 3′-diaminodiphenyl (33′DDS) sulfone diamines crosslinking hardeners. The structural, linear optical and mechanical properties of the investigated sample were analysed. Dynamic Mechanical Thermal Analysis and wide-angle x-ray diffraction were conducted to select a candidate presenting interesting thermo-mechanical properties and particular nanostructures embedded in an amorphous matrix. Our choice is therefore focused on DGEBA/33′DDS polymer for which, rocking curve measurements revealed the existence of two principal reflecting planes inclined to each other by about 0.27°. To highlight the potential effect of these interfaces, Thermally Stimulated Depolarization Current (TSDC) and Time Domain Spectroscopy measurements have been carried out. The application of the windowing polarization TSDC technique, in DGEBA/33′DDS polymer sample, gives an almost linear variation of the activation energies in the range between 3.65 and 4.09 eV. To our knowledge, this is the first study concerning epoxy polymers in which activation energies associated to ρ interfacial charge relaxations are calculated. To study the effect of the interfaces and trapped charge carriers, correlated by the angle x-ray diffraction measurements, the optical parameters were investigated. Our contribution will open a new avenue for developing the DGEBA/ 33′DDS polymer sustainable candidate in optoelectronic engineering applications.

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Section: Dmta Resultsmentioning

confidence: 99%

Exploring the structural properties and enhancement of Opto-electrical investigations for the synthesized epoxy based polymers with local nanoscale structures

Jilani

Fourati

Zerrouki

et al. 2020

Mater. Res. Express

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“…Epoxy resins have been widely employed as shape memory thermostable materials [7][8][9][10]. The low molecular weight epoxy prepolymer is cured to give rise to a crosslinked rigid structure and to obtain shape memory properties, another component that must be incorporated in order to give the material its switching abilities.…”

Section: Introductionmentioning

confidence: 99%

Reprogrammable Permanent Shape Memory Materials Based on Reversibly Crosslinked Epoxy/PCL Blends

et al. 2020

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Epoxy/Polycaprolactone (PCL) blends cured with a conventional diamine (4,4′-diaminodiphenylmethane, DDM) and with different amounts of a disulfide containing diamine (4, 4´-dithioaniline, DSS) were prepared through melting. The curing process was studied by FTIR and differential scanning calorimetry (DSC) and the mechanical behavior of the networks was studied by DMA. The shape memory properties and the recyclability of the materials were also analyzed. All blends showed a very high curing degree and temperature activated shape memory effect, related to the glass transition of the epoxy resin. The PCL plasticized the mixture, allowing tailoring of the epoxy glass transition. In addition, in the blends cured with DSS, as a consequence of the disulfide exchange reaction, the permanent shape could be erased and a new shape could be reprogrammed. Using this strategy, reprogrammable permanent shape memory materials were obtained.

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“…Many experimental studies have been carried out to characterize the macro-and microscopic material properties of SMPs and to investigate one-way shape memory in SMPs. Various SMPs have been studied, including epoxy resin (Chen et al, 2014;Song et al, 2011), polyurethanes (Hong et al, 2007;Tobushi et al, 1996;Wang et al, 2010), polyimide (Xiao et al, 2015), commercially available SMPs (Richard and Lisa Mauck, 2008), and poly(cyclooctene) (PCO) (Liu et al, 2002). Two-way shape memory, i.e., reversible deformation behavior in response to an on-off stimulus, has also been demonstrated using one-way SMPs and bias loads (Chung et al, 2007;Hong et al, 2010;Pandini et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional constitutive model for shape memory polymers using multiplicative decomposition of the deformation gradient and shape memory strains

Park

Harrison

Zhang

et al. 2016

Mechanics of Materials

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Synthesis and thermomechanical research of shape memory epoxy systems

Cited by 49 publications

References 24 publications

Exploring the structural properties and enhancement of Opto-electrical investigations for the synthesized epoxy based polymers with local nanoscale structures

Exploring the structural properties and enhancement of Opto-electrical investigations for the synthesized epoxy based polymers with local nanoscale structures

Reprogrammable Permanent Shape Memory Materials Based on Reversibly Crosslinked Epoxy/PCL Blends

Three-dimensional constitutive model for shape memory polymers using multiplicative decomposition of the deformation gradient and shape memory strains

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