Carbon nanotube–vitrimer composite for facile and efficient photo-welding of epoxy

Yang, Yang; Pei, Zhiqiang; Zhang, Xiqi; Tao, Lei; Wei, Yen; Ji, Yan

doi:10.1039/c4sc00543k

Cited by 267 publications

(228 citation statements)

References 59 publications

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“…20 Carbon nanotubes absorb light of almost all wavelengths and transform the energy to heat, resulting in fast and precise local heating. CNT-impregnated vitrimers were successfully reshaped, healed and even welded with non-CNT-vitrimers via irradiation with an infrared laser.…”

Section: Vitrimer Materialsmentioning

confidence: 99%

Vitrimers: permanent organic networks with glass-like fluidity

2016

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Section: Vitrimer Materialsmentioning

confidence: 99%

Vitrimers: permanent organic networks with glass-like fluidity

2016

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“…CNTs have been successfully used to assist self‐healing of vitrimers through near infrared absorption. The CNT loading used in this study is the lowest by comparison with data reported in literature . In addition, the dual exchange reactions in this vitrimer system allowed for better recovery of mechanical properties.…”

Section: Selected Fast Self‐healing Systems For Mechanical Property Rmentioning

confidence: 72%

“…Using small amounts of carbon nanotubes or graphene nanoplatelets decreased the healing time significantly. Incorporation of 1 wt% of CNTs into epoxy vitrimer decreased self‐healing time of a partially cut sample down to 30 s and 80% of the mechanical strength was recovered . Addition of 0.1 wt% CNTs to polyurethane vitrimer elastomer also decreased the self‐healing time to 1 min and 10% of the total strength was recovered …”

Section: Selected Fast Self‐healing Systems For Mechanical Property Rmentioning

confidence: 98%

“…In this case, organoaniline absorbed NIR and produced the required heat for self‐healing. Due to the high NIR absorbance capability of nanotubes and graphene nanoplatelets, they are used in vitrimers to generate the heat required for activation of the exchange reactions. Using small amounts of carbon nanotubes or graphene nanoplatelets decreased the healing time significantly.…”

Section: Selected Fast Self‐healing Systems For Mechanical Property Rmentioning

confidence: 99%

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Ultra‐Fast Microwave Assisted Self‐Healing of Covalent Adaptive Polyurethane Networks with Carbon Nanotubes

Bonab

Karimkhani

Manas‐Zloczower

2018

Macro Materials & Eng

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Vitrimers are a class of covalent adaptive networks which, unlike other covalent networks, can be thermally reprocessed, recycled, and are self‐healing. In this research, a polyurethane vitrimer network is prepared using 1,4‐phenylene diisocyanate and excess amount of polycaprolactone polyol. The dynamic nature of this network is provided by a dual effect of dynamic transesterification reactions as well as dynamic transcarbamoylation reactions. This vitrimer can be reshaped, be recycled, and heal potential defects at high enough temperatures. A fast healing strategy is developed by the addition of small amounts (0.05 wt%) of carbon nanotubes (CNTs) which enables the use of microwave radiation for an efficient fast healing process. Using this strategy the healing time decreases more than 30 times compared to using a conventional oven. CNTs also enhance the vitrimer mechanical properties and compensate for the mechanical property loss of the dynamic PU network in comparison to the permanent PU network.

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“…Organic nanoparticles with aggregation induced emission properties based on dynamic bonds have previously been developed. [29–31] Fiber-reinforced composites, [32] carbon nanotube composites, [33] and silica nanocomposites [34] made of a dynamic epoxy resin have been investigated. Also, transesterification-based shape memory composites based on graphene-filled vitrimers were prepared.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Covalent Chemistry at Interfaces: Development of Tougher, Healable Composites through Stress Relaxation at the Resin–Silica Nanoparticles Interface

Sowan

Cox

Shah

et al. 2018

Adv Materials Inter

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The interfacial region in composites that incorporate filler materials of dramatically different modulus relative to the resin phase acts as a stress concentrator and becomes a primary locus for composite failure. A novel adaptive interface (AI) platform formed by coupling moieties capable of dynamic covalent chemistry (DCC) is introduced to the resin–filler interface to promote stress relaxation. Specifically, silica nanoparticles (SNP) are functionalized with a silane capable of addition fragmentation chain transfer (AFT), a process by which DCC-active bonds are reversibly exchanged upon light exposure and concomitant radical generation, and copolymerized with a thiol-ene resin. At a fixed SNP loading of 25 wt%, the toughness (2.3 MJ m−3) is more than doubled and polymerization shrinkage stress (0.4 MPa) is cut in half in the AI composite relative to otherwise identical composites that possess a passive interface (PI) with similar silane structure, but without the AFT moiety. In situ activation of the AI during mechanical loading results in 70% stress relaxation and three times higher fracture toughness than the PI control. When interfacial DCC was combined with resin-based DCC, the toughness was improved by 10 times relative to the composite without DCC in either the resin or at the resin–filler interface.

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Carbon nanotube–vitrimer composite for facile and efficient photo-welding of epoxy

Cited by 267 publications

References 59 publications

Vitrimers: permanent organic networks with glass-like fluidity

Vitrimers: permanent organic networks with glass-like fluidity

Ultra‐Fast Microwave Assisted Self‐Healing of Covalent Adaptive Polyurethane Networks with Carbon Nanotubes

Dynamic Covalent Chemistry at Interfaces: Development of Tougher, Healable Composites through Stress Relaxation at the Resin–Silica Nanoparticles Interface

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