Shape memory polymer network with thermally distinct elasticity and plasticity

Zhao, Qian; Zou, Weike; Luo, Yingwu; Xie, Tao

doi:10.1126/sciadv.1501297

Cited by 457 publications

(429 citation statements)

References 34 publications

Supporting

Mentioning

421

Contrasting

Unclassified

Order By: Relevance

“…This rapid fabrication of shape memory polymers with complex 3D permanent geometries is highly desirable for device applications of shape memory polymers. [1,6,30] In particular, the low surface energy of the wax-like material along with its shape memory function makes it highly attractive for use as smart molds to make polymer parts. In addition, the material can also be used for lost-wax casting, in which the wax-based material serves as the sacrificial mold (burned out after the process) to make metal parts with intricate 3D shapes (e.g., custom jewelry).…”

Section: Doi: 101002/adma201605390mentioning

confidence: 99%

Ultrafast Digital Printing toward 4D Shape Changing Materials

et al. 2016

Self Cite

View full text Add to dashboard Cite

Ultrafast 4D printing (<30 s) of responsive polymers is reported. Visible-light-triggered polymerization of commercial monomers defines digitally stress distribution in a 2D polymer film. Releasing the stress after the printing converts the structure into 3D. An additional dimension can be incorporated by choosing the printing precursors. The process overcomes the speed limiting steps of typical 3D (4D) printing.

show abstract

Section: Doi: 101002/adma201605390mentioning

confidence: 99%

Ultrafast Digital Printing toward 4D Shape Changing Materials

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…The urethane coatings were reported to undergo hydrolysis in the body, resulting in the presence of aromatic amines formed after hydrolysis of the carbamate, but the hydrolysis was a result of testing conditions that did not align with what the material would have experienced in vivo . This ultimately yielded data that does not accurately predict toxicity and stability over time [1–3,17–21]. Additional long term studies of these polyurethane foams have further indicated a reduced rate of tumorogenesis, no association between cancer incidence and the use of the aromatic diisocyanates, and no long term risk of cancer in both animal and human studies.…”

Section: Introductionmentioning

confidence: 99%

Shape memory polyurethanes with oxidation-induced degradation: In vivo and in vitro correlations for endovascular material applications

et al. 2017

View full text Add to dashboard Cite

The synthesis of thermoset shape memory polymer (SMP) polyurethanes from symmetric, aliphatic alcohols and diisocyanates has previously demonstrated excellent biocompatibility in short term in vitro and in vivo studies, although long term stability has not been investigated. Here we demonstrate that while rapid oxidation occurs in these thermoset SMPs, facilitated by the incorporation of multi-functional, branching amino groups, byproduct analysis does not indicate toxicological concern for these materials. Through complex multi-step chemical reactions, chain scission begins from the amines in the monomeric repeat units, and results, ultimately, in the formation of carboxylic acids, secondary and primary amines; the degradation rate and product concentrations were confirmed using liquid chromatography mass spectrometry, in model compound studies, yielding a previously unexamined degradation mechanism for these biomaterials. The rate of degradation is dependent on the hydrogen peroxide concentration, and comparison of explanted samples reveals a much slower rate in vivo compared to the widely accepted literature in vitro real-time equivalent of 3% H2O2. Cytotoxicity studies of the material surface, and examination of the degradation product accumulations, indicate that degradation has negligible impact on cytotoxicity of these materials.

show abstract

“…[1][2][3] Photons with frequencies lying in the PBGs cannot propagate through the crystals, providing enormous opportunities in controlling the flow of light in miniature volumes for photo nic information technology, such as nextgeneration all-optical integrated circuits. [12][13][14][15][16][17] Smart shape memory polymers (SMPs), which can memorize and transit between a permanent shape and one or multiple temporary configurations in responding to various stimuli, such as heat, light, solvents, and electromagnetic fields, [18][19][20][21][22][23][24][25] may hold the key to truly reconfigurable photonic crystals. [12][13][14][15][16][17] Smart shape memory polymers (SMPs), which can memorize and transit between a permanent shape and one or multiple temporary configurations in responding to various stimuli, such as heat, light, solvents, and electromagnetic fields, [18][19][20][21][22][23][24][25] may hold the key to truly reconfigurable photonic crystals.…”

Section: Introductionmentioning

confidence: 99%

Programmable Macroporous Photonic Crystals Enabled by Swelling‐Induced All‐Room‐Temperature Shape Memory Effects

Leo

et al. 2017

Adv Funct Materials

View full text Add to dashboard Cite

This study reports unconventional, all-room-temperature shape memory (SM) effects using templated macroporous shape memory polymer (SMP) photonic crystals comprising a glassy copolymer with high-glass transition temperature. "Cold" programming of permanent periodic structures into temporary disordered configurations can be achieved by slowly evaporating various swelling solvents (e.g., ethanol) imbibed in the interconnecting macropores. The deformed macropores can be instantaneously recovered to the permanent geometry by exposing it to vapors and liquids of swelling solvents. By contrast, nonswelling solvents (e.g., hexane) cannot trigger "cold" programming and SM recovery. Extensive experimental and theoretical investigations reveal that the dynamics of swelling-induced plasticizing effects caused by fast diffusion of solvent molecules into the walls of macropores with nanoscopic thickness dominate both "cold" programming and recovery processes. Importantly, the striking color changes associated with the reversible SM transitions enable novel chromogenic sensors for selectively detecting trace amounts of swelling analytes mixed in nonswelling solvents. Using ethanol-hexane solutions as proof-of-concept mixtures, the ethanol detection limit of 150 ppm has been demonstrated. Besides reusable sensors, which can find important applications in environmental monitoring and petroleum process/product control, the programmable SMP photonic crystals possessing high mechanical strengths and all-room-temperature processability can provide vast opportunities in developing reconfigurable/rewritable nanooptical devices.

show abstract

Shape memory polymer network with thermally distinct elasticity and plasticity

Abstract: Shape memory polymer with thermally distinct elasticity and plasticity enables highly complex shape manipulations.

Cited by 457 publications

References 34 publications

Ultrafast Digital Printing toward 4D Shape Changing Materials

Ultrafast Digital Printing toward 4D Shape Changing Materials

Shape memory polyurethanes with oxidation-induced degradation: In vivo and in vitro correlations for endovascular material applications

Programmable Macroporous Photonic Crystals Enabled by Swelling‐Induced All‐Room‐Temperature Shape Memory Effects

Contact Info

Product

Resources

About