Supramolecular shape memory polymers

Hu, Jinlian

doi:10.1533/9780857098542.111

Cited by 7 publications

(14 citation statements)

References 57 publications

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“…Reversible behavior occurs during heating and cooling in the presence or absence of external stress. In this study, EJO/MHPA polymer agreed with the two-way SME theoretically reported [ 39 ]. Figure 9 shows the demonstration of the shape-memory behaviors of EJO/MHPA polymers at molar ratio of 1.0.…”

Section: Resultssupporting

confidence: 91%

Non Edible Oil-Based Epoxy Resins from Jatropha Oil and Their Shape Memory Behaviors

et al. 2021

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The use of bio-based polymers in place of conventional polymers gives positives effects in the sense of reduction of environmental impacts and the offsetting of petroleum consumption. As such, in this study, jatropha oil was used to prepare epoxidized jatropha oil (EJO) by the epoxidation method. The EJO was used to prepare a shape memory polymer (SMP) by mixing it with the curing agent 4-methylhexahydrophthalic anhydride (MHPA) and a tetraethylammonium bromide (TEAB) catalyst. The resulting bio-based polymer is slightly transparent and brown in color. It has soft and flexible properties resulting from the aliphatic chain in jatropha oil. The functionality of SMP was analyzed by Fourier transform infrared (FTIR) spectroscopy analysis. The thermal behavior of the SMP was measured by thermogravimetric analysis (TGA), and it showed that the samples were thermally stable up to 150 °C. Moreover, the glass transition temperature characteristic was obtained using differential scanning calorimetry (DSC) analysis. The shape memory recovery behavior was investigated. Overall, EJO/MHPA was prepared by a relatively simple method and showed good shape recovery properties.

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Section: Resultssupporting

confidence: 91%

Non Edible Oil-Based Epoxy Resins from Jatropha Oil and Their Shape Memory Behaviors

et al. 2021

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“…Soft segments respond to external stimuli such as temperature [ 24 , 29 , 40 , 41 , 42 ], water [ 43 , 44 ], ultrasound [ 25 , 45 ] and others [ 31 , 46 , 47 ], forming additional cross links or undergoing crystallization to affix a temporary shape in the fixing stage. The hard segments are permanent networks and remain unchanged during the programing process [ 48 , 49 , 50 ]. This region generates a spring that stores elastic potential energy, which is the driving force for recovering the original shape, when the soft segments are triggered by external stimuli [ 48 , 49 , 50 ].…”

Section: Control Of Properties Of Bsmpsmentioning

confidence: 99%

“…The hard segments are permanent networks and remain unchanged during the programing process [ 48 , 49 , 50 ]. This region generates a spring that stores elastic potential energy, which is the driving force for recovering the original shape, when the soft segments are triggered by external stimuli [ 48 , 49 , 50 ].…”

Section: Control Of Properties Of Bsmpsmentioning

confidence: 99%

“…The mobility of soft segments with relatively low glass transition temperatures (T g ) or melting temperatures (Tm) significantly increases above the transition temperature (T t ) [ 36 , 49 , 51 ]. Cooling of the soft segments whose shape is deformed by stress enables the formation of temporary crosslinks or crystallization, maintaining the deformed shape [ 36 , 49 , 50 , 51 ]. The permanent polymer network comprises hard segments with high T t [ 36 , 49 , 50 , 51 ].…”

Section: Control Of Properties Of Bsmpsmentioning

confidence: 99%

“…Cooling of the soft segments whose shape is deformed by stress enables the formation of temporary crosslinks or crystallization, maintaining the deformed shape [ 36 , 49 , 50 , 51 ]. The permanent polymer network comprises hard segments with high T t [ 36 , 49 , 50 , 51 ]. This network, unaffected at T t , stores the elastic potential energy for recovering its original shape [ 8 , 9 , 36 ].…”

Section: Control Of Properties Of Bsmpsmentioning

confidence: 99%

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Principles for Controlling the Shape Recovery and Degradation Behavior of Biodegradable Shape-Memory Polymers in Biomedical Applications

Lee

Kang

2021

Micromachines

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Polymers with the shape memory effect possess tremendous potential for application in diverse fields, including aerospace, textiles, robotics, and biomedicine, because of their mechanical properties (softness and flexibility) and chemical tunability. Biodegradable shape memory polymers (BSMPs) have unique benefits of long-term biocompatibility and formation of zero-waste byproducts as the final degradable products are resorbed or absorbed via metabolism or enzyme digestion processes. In addition to their application toward the prevention of biofilm formation or internal tissue damage caused by permanent implant materials and the subsequent need for secondary surgery, which causes secondary infections and complications, BSMPs have been highlighted for minimally invasive medical applications. The properties of BSMPs, including high tunability, thermomechanical properties, shape memory performance, and degradation rate, can be achieved by controlling the combination and content of the comonomer and crystallinity. In addition, the biodegradable chemistry and kinetics of BSMPs, which can be controlled by combining several biodegradable polymers with different hydrolysis chemistry products, such as anhydrides, esters, and carbonates, strongly affect the hydrolytic activity and erosion property. A wide range of applications including self-expending stents, wound closure, drug release systems, and tissue repair, suggests that the BSMPs can be applied as actuators on the basis of their shape recovery and degradation ability.

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Shape-Memory Behavior of Polylactide/Silica Ionic Hybrids

et al. 2017

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Commercial polylactide (PLA) was converted and endowed with shape-memory properties by synthesizing ionic hybrids based on blends of PLA with imidazolium-terminated PLA and poly[ε-caprolactone-co-D,L-lactide] (P[CL-co-LA]) and surfacemodified silica nanoparticles. The electrostatic interactions assist with the silica nanoparticle dispersion in the polymer matrix. Since nanoparticle dispersion in polymers is a perennial challenge and has prevented nanocomposites from reaching their full potential in terms of performance we expect this new design will be exploited in other polymers systems to synthesize well-dispersed nanocomposites. Rheological measurements of the ionic hybrids are consistent with the formation of a network. The ionic hybrids are also much more deformable compared to the neat PLA. More importantly, they exhibit shape-memory behavior with fixity ratio R f ≈ 100% and recovery ratio R r = 79%, for the blend containing 25 wt % im-PLA and 25 wt % im-P[CL-co-LA] and 5 wt % of SiO 2 −SO 3 Na. Dielectric spectroscopy and dynamic mechanical analysis show a second, low-frequency relaxation attributed to strongly immobilized polymer chains on silica due to electrostatic interactions. Creep compliance tests further suggest that the ionic interactions prevent permanent slippage in the hybrids which is most likely responsible for the significant shape-memory behavior observed.

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Supramolecular shape memory polymers

Cited by 7 publications

References 57 publications

Non Edible Oil-Based Epoxy Resins from Jatropha Oil and Their Shape Memory Behaviors

Non Edible Oil-Based Epoxy Resins from Jatropha Oil and Their Shape Memory Behaviors

Principles for Controlling the Shape Recovery and Degradation Behavior of Biodegradable Shape-Memory Polymers in Biomedical Applications

Shape-Memory Behavior of Polylactide/Silica Ionic Hybrids

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