Bio-based polyurethanes with shape memory behavior at body temperature: effect of different chain extenders

Gu, Lin; Cui, Bin; Wu, Qingyun; Yu, Haibin

doi:10.1039/c5ra26308e

Cited by 47 publications

(29 citation statements)

References 46 publications

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“…With the soft segments being the deciding factor of shape-memory transition temperatures, this result also suggests that the shape-memory transition temperature can be adjusted to body temperature by carefully selecting both the molecular mass of the diols and SSC, thus bringing the possibility of potential biomedical applications. [24] From a morphological point of view, it has been shown in other TPU systems[25, 26] that due to free-energy constraints, with 70 % SSC, the hard segments form globular domains dispersed in a continuous soft-segment matrix; whereas with 50 % SSC the soft and hard domains display a co-continuous morphology. We surmise that TPUs with 60 % SSC have a mixed morphology, as suggested previously based on both structural investigation and mechanical testing results.…”

Section: Resultsmentioning

confidence: 99%

Fast-responding bio-based shape memory thermoplastic polyurethanes

Petrovìć

Milić

Zhang

et al. 2017

Polymer

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Novel fast response shape-memory polyurethanes were prepared from bio-based polyols, diphenyl methane diisocyanate and butane diol for the first time. The bio-based polyester polyols were synthesized from 9-hydroxynonanoic acid, a product obtained by ozonolysis of fatty acids extracted from soy oil and castor oil. The morphology of polyurethanes was investigated by synchrotron ultra-small angle X-ray scattering, which revealed the inter-domain spacing between the hard and soft phases, the degree of phase separation, and the level of intermixing between the hard and soft phases. We also conducted thorough investigations of the thermal, mechanical, and dielectric properties of the polyurethanes, and found that high crystallization rate of the soft segment gives these polyurethanes unique properties suitable for shape-memory applications, such as adjustable transition temperatures, high degree of elastic elongations, and good mechanical strength. These materials are also potentially biodegradable and biocompatible, therefore suitable for biomedical and environmental applications.

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Section: Resultsmentioning

confidence: 99%

Fast-responding bio-based shape memory thermoplastic polyurethanes

Petrovìć

Milić

Zhang

et al. 2017

Polymer

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“…Their work is conductive to the structural and performance design of smart materials. Gu et al . synthesized the bio‐based SMPUs, and the chain extenders were used to adjust their T t and shape memory properties for practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…Their work is conductive to the structural and performance design of smart materials. Gu et al 11 synthesized the bio-based SMPUs, and the chain extenders were used to adjust their T t and shape memory properties for practical applications. Witzleben et al 12 investigated polyether and polyether-/ester-based thermoplastic PUs using wideangle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS).…”

Section: Introductionmentioning

confidence: 99%

Microstructural and mechanical property evolutions of shape memory polyurethane during a thermodynamic cycle

Shi

Shen

2017

J of Applied Polymer Sci

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To better understand the shape memory behaviors of synthesized shape memory polyurethane (SMPU) sealant with a tailored transition temperature (Tt) for concrete pavement joints, the thermal and dynamic mechanical properties of SMPU were first characterized to determine the shape memory switching temperature of SMPU. Then the microstructural and mechanical property evolutions of SMPU in the original, programmed, and recovered states during a five‐step thermodynamic cycle were discussed, respectively. The results indicate that the tailored Tt of prepared SMPU can be used as the shape memory switching temperature to match its working temperature. Further, the programming causes the phase separation in SMPU, leading to an obvious anisotropy. The SMPU has satisfactory shape memory performance. The orientation of molecular chains in soft segments is confirmed along the stretching direction. The oriented molecular chains can restore to the naturally curled state during the free recovery. Finally, the programming improves the mechanical properties of SMPU. The recovered SMPU shows a slight decrease in mechanical properties because of the partially impaired crystal structures and broken molecular segments during the programming and recovery. It is concluded that the synthesized SMPU with the specially tailored Tt is suitable to use as a sealant of concrete pavement joints. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45703.

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“…To overcome the drawbacks, SMP‐based composites (especially nanocomposites) were developed for enhancing the mechanical properties . Most SMPs are thermo‐triggered, which may be not practical when outer heating sources are not available . So researchers attempted to expand the actuation routes of SMPs, that is, from thermal to non‐thermal triggering (such as electricity, magnetism, light, water, and microwave).…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes array reinforced shape‐memory epoxy with fast responses to low‐power microwaves

Chen

Xiao-pei

et al. 2019

J of Applied Polymer Sci

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In this study, epoxy shape-memory polymer (ESMP) was infiltrated into the scaffolds of vertically aligned carbon nanotubes (CNTs) array grown by chemical vapor deposition (CVD). In the fabricated CNTs array/ESMP nanocomposite, the CNTs interconnected with each other and a three-dimensional (3D) network of the CNTs was formed. As a result, both thermal conductivity and electrical conductivity of the CNTs array/ESMP nanocomposite were higher than the random CNTs/ESMP composite fabricated by conventional high-speed mechanical stirring. In the random CNTs/ESMP composite, the CNTs aggregated seriously in the matrix. Along the CNTs axis, The CNTs array/ESMP nanocomposite showed a higher modulus and hardness than the random CNTs/ESMP composite, as revealed by nanoindentation tests. Under microwave radiation, the temperature of the CNTs array/ESMP nanocomposite increased more rapidly than pristine ESMP and the random CNTs/ESMP composite. Consequently, the CNTs array/ESMP nanocomposite showed a faster shape recovery speed compared with pristine ESMP and the random CNTs/ESMP composite in their microwavetriggered shape memory behaviors. Especially, the CNTs array/ESMP nanocomposite can recover the deformation fully in response to as low as 60 W microwaves. The presented CNTs array/ESMP nanocomposite with improved mechanical property and fast responses to low-power microwaves may find potential applications in smart devices.

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Bio-based polyurethanes with shape memory behavior at body temperature: effect of different chain extenders

Abstract: The chain extenders are used to adjust the transition temperatures and shape memory properties of bio-based shape memory polyurethanes.

Cited by 47 publications

References 46 publications

Fast-responding bio-based shape memory thermoplastic polyurethanes

Fast-responding bio-based shape memory thermoplastic polyurethanes

Microstructural and mechanical property evolutions of shape memory polyurethane during a thermodynamic cycle

Carbon nanotubes array reinforced shape‐memory epoxy with fast responses to low‐power microwaves

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