Self-healing poly(siloxane-urethane) elastomers with remoldability, shape memory and biocompatibility

2016 ◽  
Vol 7 (47) ◽  
pp. 7278-7286 ◽  
Author(s):  
Jian Zhao ◽  
Rui Xu ◽  
Gaoxing Luo ◽  
Jun Wu ◽  
Hesheng Xia
Keyword(s):  
Mechanical Property ◽  
Shape Memory ◽  
Microphase Separation ◽  
Diels Alder ◽  
Good Mechanical Property ◽  
Self Healing ◽  
Healing Efficiency ◽  
Good Biocompatibility

The poly(siloxane-urethane) elastomers with microphase separation structure and Diels–Alder bonds show high healing efficiency, good mechanical property and good biocompatibility.

scholarly journals Multiple-responsive shape memory polyacrylonitrile/graphene nanocomposites with rapid self-healing and recycling properties

RSC Advances ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 1225-1231 ◽  
Author(s):  
Chenting Cai ◽  
Yue Zhang ◽  
Mei Li ◽  
Yan Chen ◽  
Rongchun Zhang ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Shape Memory ◽  
Covalent Bond ◽  
Diels Alder ◽  
Self Healing ◽  
Graphene Nanocomposites ◽  
Graphene Nanocomposite

A Diels–Alder covalent bond based crosslinked polyacrylonitrile/graphene nanocomposite is reported, which has the multiple-responsive properties of shape memory, self-healing, and reprocessing in addition to enhanced mechanical property.

Self-Healing and Shape Memory Linear Polyurethane Based on Disulfide Linkages with Excellent Mechanical Property

2018 ◽  
Vol 26 (4) ◽  
pp. 365-373 ◽  
Author(s):  
Lei Ling ◽  
Jinhui Li ◽  
Guoping Zhang ◽  
Rong Sun ◽  
Ching-Ping Wong
Keyword(s):  
Mechanical Property ◽  
Shape Memory ◽  
Self Healing ◽  
Disulfide Linkages ◽  
Excellent Mechanical Property

scholarly journals Introduction of Reversible Urethane Bonds Based on Vanillyl Alcohol for Efficient Self-Healing of Polyurethane Elastomers

Molecules ◽  
2019 ◽  
Vol 24 (12) ◽  
pp. 2201 ◽  
Author(s):  
Dae-Woo Lee ◽  
Han-Na Kim ◽  
Dai-Soo Lee
Keyword(s):  
Hydrogen Bonding ◽  
Microphase Separation ◽  
Chain Extender ◽  
The Self ◽  
Phenolic Hydroxyl ◽  
Vanillyl Alcohol ◽  
Self Healing ◽  
Alcohol Content ◽  
Urethane Group ◽  
Healing Efficiency

Urethane groups formed by reacting phenolic hydroxyl groups with isocyanates are known to be reversible at high temperatures. To investigate the intrinsic self-healing of polyurethane via a reversible urethane group, we synthesized vanillyl alcohol (VA)-based polyurethanes. The phenolic hydroxyl group of vanillyl alcohol allows the introduction of a reversible urethane group into the polyurethane backbone. Particularly, we investigated the effects of varying the concentration of reversible urethane groups on the self-healing of the polyurethane, and we proposed a method that improved the mobility of the molecules contributing to the self-healing process. The concentration of reversible urethane groups in the polyurethanes was controlled by varying the vanillyl alcohol content. Increasing the concentration of the reversible urethane group worsened the self-healing property by increasing hydrogen bonding and microphase separation, which consequently decreased the molecular mobility. On the other hand, after formulating a modified chain extender (m-CE), hydrogen bonding and microphase separation decreased, and the mobility (and hence the self-healing efficiency) of the molecules improved. In VA40-10 (40% VA; 10% m-CE) heated to 140 °C, the self-healing efficiency reached 96.5% after 30 min, a 139% improvement over the control polyurethane elastomer (PU). We conclude that the self-healing and mechanical properties of polyurethanes might be tailored for applications by adjusting the vanillyl alcohol content and modifying the chain extender.

scholarly journals Balancing Self-Healing and Shape Stability in Dynamic Covalent Photoresins for Stereolithography 3D Printing

2021 ◽  
Author(s):  
Alejandra Durand-Silva ◽  
Karen Cortés-Guzmán ◽  
Rebecca Johnson ◽  
Sachini Perera ◽  
Ron Smaldone
Keyword(s):  
3D Printing ◽  
Scratch Test ◽  
Diels Alder ◽  
Self Healing ◽  
Shape Stability ◽  
Covalent Bonds ◽  
Dimensional Changes ◽  
Healing Efficiency ◽  
3D Printed ◽  
Efficient Manufacturing

Dynamic covalent bonds impart new properties to 3D printable materials that help to establish 3D printing as an accessible and efficient manufacturing technique. Here, we studied the effect of a thermally reversible Diels-Alder crosslinker on the shape stability of photoprintable resins and their self-healing properties. Resins containing different concentrations of dynamic covalent crosslinks in a polyacrylate network showed that the content of dynamic crosslinks plays a key role in balancing shape stability with self-healing ability. The shape stability of the printed objects was evaluated by measuring the dimensional changes after thermal treatment. The self-healing efficiency of the 3D printed resins was characterized with a scratch test and tensile testing. A dynamic covalent crosslink concentration of 1.8 mol % was enough to provide 99% self-healing efficiency without disrupting the shape stability of the printed objects. Our work shows the potential of dynamic covalent bonds in broadening the availability of 3D printable materials that are compatible with vat photopolymerization.

scholarly journals Balancing Self-Healing and Shape Stability in Dynamic Covalent Photoresins for Stereolithography 3D Printing

2021 ◽  
Author(s):  
Alejandra Durand-Silva ◽  
Karen Cortés-Guzmán ◽  
Rebecca Johnson ◽  
Sachini Perera ◽  
Ron Smaldone
Keyword(s):  
3D Printing ◽  
Scratch Test ◽  
Diels Alder ◽  
Self Healing ◽  
Shape Stability ◽  
Covalent Bonds ◽  
Dimensional Changes ◽  
Healing Efficiency ◽  
3D Printed ◽  
Efficient Manufacturing

Dynamic covalent bonds impart new properties to 3D printable materials that help to establish 3D printing as an accessible and efficient manufacturing technique. Here, we studied the effect of a thermally reversible Diels-Alder crosslinker on the shape stability of photoprintable resins and their self-healing properties. Resins containing different concentrations of dynamic covalent crosslinks in a polyacrylate network showed that the content of dynamic crosslinks plays a key role in balancing shape stability with self-healing ability. The shape stability of the printed objects was evaluated by measuring the dimensional changes after thermal treatment. The self-healing efficiency of the 3D printed resins was characterized with a scratch test and tensile testing. A dynamic covalent crosslink concentration of 1.8 mol % was enough to provide 99% self-healing efficiency without disrupting the shape stability of the printed objects. Our work shows the potential of dynamic covalent bonds in broadening the availability of 3D printable materials that are compatible with vat photopolymerization.

A novel self-healing composite made of thermally reversible polymer and shape memory alloy reinforcement

2019 ◽  
Vol 30 (10) ◽  
pp. 1585-1593 ◽  
Author(s):  
Ali Saeedi ◽  
Mahmood M Shokrieh
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Structures ◽  
Fracture Behavior ◽  
Micromechanical Model ◽  
Self Healing ◽  
Compression Tests ◽  
Healing Efficiency ◽  
Shape Memory Effects ◽  
Good Agreement

A novel self-healing polymer composite made of the thermally reversible polymer matrix and shape memory alloy reinforcement is introduced. The healing system is designed in such a way that by heating the structure, activation of shape recovery in shape memory alloy and chemical reversible reactions in polymer occur simultaneously. In the present healing method, the required crack closure force is provided by activating the embedded shape memory alloy wires in the polymer. Both superelastic and shape memory effects of shape memory alloy are considered on the fracture behavior of composites by investigating the passive and active reinforcement methods, respectively. Double cleavage drilled compression tests are utilized in order to study the fracture behavior and healing efficiency of composites. In the case of passive reinforcement, embedding 2% prestrained shape memory alloy wires caused 15% enhancement in the fracture toughness of composites. In this prestrain level, results of the micromechanical model are in good agreement with experiments. Promising results are also obtained for healing efficiency of composites in the case of active reinforcement. The average healing efficiency of 92% is achieved for shape memory alloy-reinforced thermally reversible epoxy composites. The excellent healing performance, without the necessity of external force and pressure, makes the present healing method as an ideal candidate for utilizing self-healing composite structures.

Imidazolium-based ionic polyurethanes with high toughness, tunable healing efficiency and antibacterial activities

2020 ◽  
Vol 11 (4) ◽  
pp. 867-875 ◽  
Author(s):  
Ning Duan ◽  
Zhe Sun ◽  
Yongyuan Ren ◽  
Ziyang Liu ◽  
Lili Liu ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Shape Memory ◽  
Antibacterial Activities ◽  
Self Healing ◽  
High Toughness ◽  
Healing Efficiency

Ionic polyurethanes (PUs) with high toughness, fast self-healing ability, antibacterial activity and shape memory behaviors are synthesized.

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