Carbon-nanotube-filled catalyst-free thermoset polyurea composites towards achieving recyclability, weldability and permanent shape reconfiguration

Jiang, Liang; Liu, Qinfeng; Yuan, Lei; Wang, Yi; Zhao, Yuanyang; Lei, Jingxin

doi:10.1039/c9qm00246d

Cited by 17 publications

(10 citation statements)

References 51 publications

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“…These HTPUs were synthesized through a facile route reported in our previous study . The synthesized secondary amine of HDLA-100 was dissolved in the solvent of anhydrous ethyl acetate.…”

Section: Methodsmentioning

confidence: 99%

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Sustainable Thermosetting Polyurea Vitrimers Based on a Catalyst-Free Process with Reprocessability, Permanent Shape Reconfiguration and Self-Healing Performance

Jiang

Liu

Yuan

et al. 2019

ACS Appl. Polym. Mater.

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Traditional thermosetting polyureas (TPUs) with eminently comprehensive performance have been used in a variety of industrial applications. However, they suffer from a certain intractable difficulty in achieving multiple functions such as reprocessability, shape reconfiguration, or self-healing performance due to the extremely stable covalent cross-linking. Herein, we employ hindered urea bonds (HUBs) as a reversible dynamic covalent cross-linkage to design catalyst-free hindered thermosetting polyureas (HTPUs). By incorporating HUBs into TPUs, the synthesized HTPUs can be reprocessed by using hot press or microinjection technique without any catalyst. In addition, those obtained materials have achieved great abilities of permanent shape reconfiguration and self-healing. Especially, the combination of the conventional elastic shape memory with the solid-state plastic shape reconfiguration in these HTPUs will broaden the geometrically complex shapes for shape memory polymer. Importantly, introducing longer and more bulky substituents into HTPUs can simultaneously endow the materials with excellent mechanical properties and the aforementioned multiple functions. Despite what is mentioned in this article, more potential HTPUs with excellent mechanical properties and multiple functions could be further designed by introducing longer and more bulky substituents into the formal polymers.

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“…These HTPUs were synthesized through a facile route reported in our previous study . The synthesized secondary amine of HDLA-100 was dissolved in the solvent of anhydrous ethyl acetate.…”

Section: Methodsmentioning

confidence: 99%

“…These HTPUs were synthesized through a facile route reported in our previous study. 39 The synthesized secondary amine of HDLA-100 was dissolved in the solvent of anhydrous ethyl acetate. A stoichiometric amount of IPDI was slowly added into HDLA-100 solution in the absence of catalyst.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Sustainable Thermosetting Polyurea Vitrimers Based on a Catalyst-Free Process with Reprocessability, Permanent Shape Reconfiguration and Self-Healing Performance

Jiang

Liu

Yuan

et al. 2019

ACS Appl. Polym. Mater.

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“…28,29 Jiang et al synthesized carbon nanotube-filled thermoset PU composites with a shape memory recovery rate of 90% under heat or NIR irradiation, based on hindered urea bonding to achieve integrated recyclability, weldability, and permanent shape reconfiguration. 30,31 Zhang et al reported a multirecyclable shape memory supramolecular PU. 32 However, the tensile strength and toughness of the PU have not been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

“…Polyurea (PU) is an attractive industrial material for industrial primers or protective coatings because of impact resistance, excellent ductility, and excellent friction resistance mechanical properties. , Jiang et al synthesized carbon nanotube-filled thermoset PU composites with a shape memory recovery rate of 90% under heat or NIR irradiation, based on hindered urea bonding to achieve integrated recyclability, weldability, and permanent shape reconfiguration. , Zhang et al reported a multirecyclable shape memory supramolecular PU . However, the tensile strength and toughness of the PU have not been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

Shape Memory Supramolecular Polyurea with Adjustable Toughness and Ultrahigh Energy Density

Leng

2022

ACS Appl. Polym. Mater.

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As typical stimulus-responsive materials, shape memory polymers (SMPs) have potential for many advanced applications owing to their controllable and programmable shape-changing properties. However, the combination of high toughness and tailorable strength remains a challenge to overcome for SMPs. Here, we engineered meticulously a supramolecular structure with quadruple and double hydrogen bonding arrays to achieve shape memory polyurea elastomers with adjustable strength and toughness. The polyurea with a supramolecular structure had the highest tensile strength of 47 MPa and ultrahigh toughness up to 256 MJ m −3 . Meanwhile, the polyurea was also adjustable to a small tensile strength of 0.87 MPa matching the tensile strength of biological soft tissue (≈1 MPa). The reversible hydrogen bonding arrays endowed polyurea with a shape memory effect as well as excellent selfhealing properties. More importantly, the prestretched polyurea could raise a 500 g weight, which is over 3968 times its own mass, up to 18 mm, because of a high energy density of 75 MJ m −3 , which was higher than the energy density of most SMPs (generally <1 MJ m −3 ).

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“…As shown in Figure h, the XRD curves of OC-8K and CNT@PCMs show two strong diffraction peaks near 19.4° and 23.5°, which correspond to the crystal planes (120) and (112), respectively. The XRD results showed that the intensity and position of the XRD peak of OC-8K and CNT@PCMs had little change, indicating that the addition of CNTs has no significant effect on the crystallization property and crystal shape of CNT@PCMs . According to Figure i,j and Table , the melting (Δ H m ) and freezing (Δ H f ) latents of OC-8K were 97.8 and 93.9 J g –1 , respectively, and the melting ( T m ) and freezing ( T f ) points of OC-8K were 42.9 and 38.7 °C, respectively.…”

Section: Results and Discussionmentioning

confidence: 98%

Elevating the Photothermal Conversion Efficiency of Phase-Change Materials Simultaneously toward Solar Energy Storage, Self-Healing, and Recyclability

Zhao

Yuan

et al. 2022

ACS Appl. Mater. Interfaces

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To alleviate the predicament of resource shortage and environmental pollution, efficiently using abundant solar energy is a great challenge. Herein, we prepared unique photothermal conversion phase-change materials, namely, CNT@PCMs, by introducing carbon nanotubes (CNTs) used as photothermal conversion materials into the recyclable matrix of phase-change materials (PCMs). These devised CNT@PCMs cleverly combine the photothermal conversion capability of CNTs and the thermal energy storage capability of traditional PCMs. Especially, the surface temperature of the prepared CNT@PCMs can be raised to 100 °C within 165 s under the solar simulator (150 mW cm −2 ), showing a surprising heating rate that is much higher than that of the reported works and achieving a higher photothermal conversion efficiency for solar energy in this work. Furthermore, these CNT@ PCMs can hold high melting latent heat with a maximum value at 110.0 J g −1 , exhibiting remarkable thermal storage ability aside from preeminent photothermal conversion capability. Intriguingly, the introduction of dynamic oxime group−carbamate bonds into the molecular structure can endow CNT@PCMs with an outstanding self-healing performance and recyclability. The broken CNT@PCMs sample can be healed in 2 min under IR-laser irradiation. Importantly, the phase-change and mechanical properties and photothermal conversion efficiency of CNT@PCMs can also remain virtually unchanged after multiple recycles. It is of great significance to design this style of CNT@PCMs for achieving the efficient utilization of solar energy and environmental protection.

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Carbon-nanotube-filled catalyst-free thermoset polyurea composites towards achieving recyclability, weldability and permanent shape reconfiguration

Abstract: The incorporation of carbon nanotubes into catalyst-free thermoset polyurea composites can achieve their excellent reprocessability by hot press or micro injection.

Cited by 17 publications

References 51 publications

Sustainable Thermosetting Polyurea Vitrimers Based on a Catalyst-Free Process with Reprocessability, Permanent Shape Reconfiguration and Self-Healing Performance

Sustainable Thermosetting Polyurea Vitrimers Based on a Catalyst-Free Process with Reprocessability, Permanent Shape Reconfiguration and Self-Healing Performance

Shape Memory Supramolecular Polyurea with Adjustable Toughness and Ultrahigh Energy Density

Elevating the Photothermal Conversion Efficiency of Phase-Change Materials Simultaneously toward Solar Energy Storage, Self-Healing, and Recyclability

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