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Your search keyword '"Ning, Nanying"' showing total 13 results
Start Over Author "Ning, Nanying" Journal industrial & engineering chemistry research
13 results on '"Ning, Nanying"'

12. Mussel-Inspired Highly Stretchable, Tough Nanocomposite Hydrogel with Self-Healable and Near-Infrared Actuated Performance

Author

Feng, Zhanbin, Zuo, Hongli, Hu, Jing, Gao, Weisheng, Yu, Bing, Ning, Nanying, Tian, Ming, and Zhang, Liqun

Abstract

Based on the adhesive mechanism of mussels, we present a facile strategy to prepare nanocomposite polydopamine–poly(N-acryloyl glycinamide)–graphene oxide (PDA–PNAGA–GO) hydrogels with lots of catechol groups in the matrix of hydrogel. The microfibril structure formed by PDA chains enables the hydrogels high stretchability (∼1500%) and toughness (6990 J/m2); the multiple hydrogen bonding interactions and π–π interactions among the PNAGA network and PDA chains also enable a hydrogel perfect self-healing performance. Moreover, GO in the hydrogel can absorb the near-infrared irradiation, resulting in the temperature difference between the surface and bottom area and then a bending deformation (with 40% of actuation degree) of the hydrogel. Besides, the GO can also make the hydrogels electrically conductive, and the self-healing efficiency (∼87% for the first healing) could also be calculated according to the retention rate of conductivity of hydrogel after being healed at 90 °C. The unique properties will enable the PDA–PNAGA–GO hydrogels to be widely used in the field of tissue engineering and soft actuators.

Published
2020
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13. Multifunctional Vitrimer-Like Polydimethylsiloxane (PDMS): Recyclable, Self-Healable, and Water-Driven Malleable Covalent Networks Based on Dynamic Imine Bond

Author

Feng, Zhanbin, Yu, Bing, Hu, Jing, Zuo, Hongli, Li, Jianping, Sun, Haibin, Ning, Nanying, Tian, Ming, and Zhang, Liqun

Abstract

Vitrimer is a new class of polymeric materials which can be reprocessed to any shape while being permanently cross-linked. We designed and synthesized a catalyst-free network with poly(dimethylsiloxane)etherimide (PDMS-NH2), terephthalaldehyde (TA), and tri(2-aminoethyl)amine (TREA) through the condensation reaction between amino groups and aldehyde groups. As a result of the exchange reaction of the dynamic imine bond obtained, this PDMS network exhibits the nature of vitrimer-like material, which is examined by solubility and stress-relaxation experiments, and the relaxation time is as short as 64 s at 130 °C. In addition, the vitrimer-like PDMS is malleable and capable of self-healing, and the mechanical properties can be maintained even after three consecutive breaking/mold pressing cycles. Especially, besides heating, this vitrimer-like PDMS can also be recycled and reshaped at ambient temperature due to the exchange reaction of dynamic imine bond when immersed in water, which will potentially lead to green processing of the elastomers.

Published
2018
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