Design of a self-healing cross-linked polyurea with dynamic cross-links based on disulfide bonds and hydrogen bonding

Li, Ting; Xie, Zhining; Xu, Jun; Weng, Yunxuan; Guo, Baohua

doi:10.1016/j.eurpolymj.2018.08.005

Cited by 117 publications

(76 citation statements)

References 51 publications

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“…Using polyureas with good self-healing ability is an ideal strategy in dealing with cracks [3], because it can ensure autonomous repair upon occurrence of cracks with particular external stimulus. Although the self-healing of several types of polymers such as polyurethanes, poly(urethane-urea)s, polyimides and epoxy resins has been extensively investigated [6,7,8,9,10,11], only limited work deals with self-healing of polyurea elastomers [3,12]. Liu et al developed a high performance antifouling coating that can self-heal at room temperature using a polydimethylsiloxane (PDMS)-based polyurea [3].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Diisocyanate Structure and Disulfide Chain Extender on Hard Segmental Packing and Self-Healing Property of Polyurea Elastomers

Zheng

Han

et al. 2019

Polymers

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Four linear polyurea elastomers synthesized from two different diisocyanates, two different chain extenders and a common aliphatic amine-terminated polyether were used as models to investigate the effects of both diisocyanate structure and aromatic disulfide chain extender on hard segmental packing and self-healing ability. Both direct investigation on hard segments and indirect investigation on chain mobility and soft segmental dynamics were carried out to compare the levels of hard segmental packing, leading to agreed conclusions that correlated well with the self-healing abilities of the polyureas. Both diisocyanate structure and disulfide bonds had significant effects on hard segmental packing and self-healing property. Diisocyanate structure had more pronounced effect than disulfide bonds. Bulky alicyclic isophorone diisocyanate (IPDI) resulted in looser hard segmental packing than linear aliphatic hexamethylene diisocyanate (HDI), whereas a disulfide chain extender also promoted self-healing ability through loosening of hard segmental packing compared to its C-C counterpart. The polyurea synthesized from IPDI and the disulfide chain extender exhibited the best self-healing ability among the four polyureas because it had the highest chain mobility ascribed to the loosest hard segmental packing. Therefore, a combination of bulky alicyclic diisocyanate and disulfide chain extender is recommended for the design of self-healing polyurea elastomers.

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Section: Introductionmentioning

confidence: 99%

“…Liu et al developed a high performance antifouling coating that can self-heal at room temperature using a polydimethylsiloxane (PDMS)-based polyurea [3]. Our research group reported the self-healing ability of a chemically crosslinked polyurea containing disulfide bonds [12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Diisocyanate Structure and Disulfide Chain Extender on Hard Segmental Packing and Self-Healing Property of Polyurea Elastomers

Zheng

Han

et al. 2019

Polymers

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“…Polyurea is widely used in the field of coatings due to its green manufacturing, high wear resistance and moisture resistance. [14][15][16] At present, some scholars have used polyurea as a microcapsule material to synthesize microcapsules. For example, Zhang et al [17] prepared microcapsules with polyurea as the shell material and noctadecane as the core material.…”

Section: Introductionmentioning

confidence: 99%

Effects of ammonium polyphosphate microencapsulated on flame retardant and mechanical properties of the rigid polyurethane foam

Cheng

Niu

et al. 2020

J of Applied Polymer Sci

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In this article, a flame retardant microcapsule ammonium polyphosphate microencapsulated by polyurea (POAPP) was successfully synthesized by interfacial polymerization method using ammonium polyphosphate (APP) as core and polyurea as shell. The microencapsulation is observed by scanning electron microscopy and characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis and hydroscopicity test, which prove the success in synthesizing microencapsulation. When the POAPP is added into rigid polyurethane foam (RPUF), the flame retardant and mechanical properties are investigated using cone calorimeter, limited oxygen index test, and compressive strength test. The PHRR of RPUF‐POAPP20 decreased from 336.52 kW/m2 (Ref. RPUF) to 203.84 kW/m2 and the THR of RPUF‐POAPP20 was only 7.6 MJ/m2, which is 33.9% lower than that of Ref. RPUF. Furthermore, the limiting oxygen index of RPUF‐POAPP20 reaches 24.8%, which increased by 36.3% compared to Ref. RPUF. Whereas the maximum compressive strength of RPUF‐POAPP5 was 7.46 MPa, which is higher than that of RPUF‐APP5.

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“…Typically, the technology of self-healing allows for the repair of physical damage and cracks, prolonging the life of a material, particularly those of polymers. In the past several years, efforts have been made to impart polymers with self-healing features, including silicones [1], thermosetting polymers [2,3,4,5], rubbers [6], polyurethanes (PUs) [7,8], and hydrogels [9,10]. Among them, PU has become an attractive candidate with its specific chemical structure and various design flexibilities which have been found to be beneficial for overcoming problems related to the weakness and decreased functionality.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Self-Healing Waterborne Polyurethane Systems Chain Extended with Chitosan

Lee

Kim

2019

Polymers

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In this study, the self-healing properties of waterborne polyurethane (WPU) were implemented by chitosan as a chain extender of polyurethane prepolymers. The physical properties and self-healing efficiency of WPU were studied by changing the molar fractions of chitosan from 0.1 to 0.3. After thermal treatment for 24 h at 110 °C, the self-healing efficiency for the tensile strength of the highest chitosan content (WPU-C3) was found to be 47%. The surface scratch was also completely restored. The efficiency of the sample with the lowest chitosan content (WPU-C1) was found to be 35%, while that of the control sample without chitosan (WPU-C0) was 4%. The self-healing properties of the as-prepared films were attributed to the exchange reactions between the hydroxyl groups of chitosan and the urethane groups in the films at elevated temperature. It is inferred that self-healing WPU can be synthesized by chain extension with chitosan.

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Design of a self-healing cross-linked polyurea with dynamic cross-links based on disulfide bonds and hydrogen bonding

Cited by 117 publications

References 51 publications

Effects of Diisocyanate Structure and Disulfide Chain Extender on Hard Segmental Packing and Self-Healing Property of Polyurea Elastomers

Effects of Diisocyanate Structure and Disulfide Chain Extender on Hard Segmental Packing and Self-Healing Property of Polyurea Elastomers

Effects of ammonium polyphosphate microencapsulated on flame retardant and mechanical properties of the rigid polyurethane foam

Synthesis of Self-Healing Waterborne Polyurethane Systems Chain Extended with Chitosan

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