Strong, detachable, and self-healing dynamic crosslinked hot melt polyurethane adhesive

Wang, Shuliang; Liu, Zenghe; Zhang, Luzhi; Guo, Yifan; Song, Jianchun; Lou, Jiaming; Guan, Qingbao; He, Chuanglong; You, Zhengwei

doi:10.1039/c9qm00233b

Cited by 104 publications

(84 citation statements)

References 33 publications

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Section: Discussionmentioning

confidence: 99%

“…SHEs are based on dynamic oxime-urethane bonds, which are a new type of dynamic covalent bond and have just recently been used to prepare dynamic polymers 5,[32][33][34][35] . However, the use of toxic catalysts and metal ions 5,32,33 and the need for high selfhealing temperatures 34,35 , greatly limit the use of these materials in the body. SHEs were readily synthesised by a one-pot polycondensation from commercial reagents (DMG, PTMEG, IPDI and glycerol) in the absence of catalysts, which improved the safety of the SHEs for biomedical applications.…”

Section: Discussionmentioning

confidence: 99%

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Self-healing polyurethane-elastomer with mechanical tunability for multiple biomedical applications in vivo

et al. 2021

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The unique properties of self-healing materials hold great potential in the field of biomedical engineering. Although previous studies have focused on the design and synthesis of self-healing materials, their application in in vivo settings remains limited. Here, we design a series of biodegradable and biocompatible self-healing elastomers (SHEs) with tunable mechanical properties, and apply them to various disease models in vivo, in order to test their reparative potential in multiple tissues and at physiological conditions. We validate the effectiveness of SHEs as promising therapies for aortic aneurysm, nerve coaptation and bone immobilization in three animal models. The data presented here support the translation potential of SHEs in diverse settings, and pave the way for the development of self-healing materials in clinical contexts.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Self-healing polyurethane-elastomer with mechanical tunability for multiple biomedical applications in vivo

et al. 2021

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“…The difficulty of this investigation shortening the research of the microstructure to extension behaviour [33]. Thermoplastic polyurethane (TPU) and the thermoset PU are chemically similar to each other; however, they have different features [34]. TPU is characterized by unique physical-chemical properties due to the reformation ability from melting state which makes it elastic, highly flexible, and suitable for many industrial applications [35].…”

Section: Thermoplastic Polyurethane Compositementioning

confidence: 99%

Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

et al. 2021

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The effect of the soft and hard polyurethane (PU) segments caused by the hydrogen link in phase-separation kinetics was studied to investigate the morphological annealing of PU and thermoplastic polyurethane (TPU). The significance of the segmented PUs is to achieve enough stability for further applications in biomedical and environmental fields. In addition, other research focuses on widening the plastic features and adjusting the PU–polyimide ratio to create elastomer of the poly(urethane-imide). Regarding TPU- and PU-nanocomposite, numerous studies investigated the incorporation of inorganic nanofillers such as carbon or clay to incorporating TPU-nanocomposite in several applications. Additionally, the complete exfoliation was observed up to 5% and 3% of TPU–clay modified with 12 amino lauric acid and benzidine, respectively. PU-nanocomposite of 5 wt.% Cloisite®30B showed an increase in modulus and tensile strength by 110% and 160%, respectively. However, the nanocomposite PU-0.5 wt.% Carbone Nanotubes (CNTs) show an increase in the tensile modulus by 30% to 90% for blown and flat films, respectively. Coating PU influences stress-strain behavior because of the interaction between the soft segment and physical crosslinkers. The thermophysical properties of the TPU matrix have shown two glass transition temperatures (Tg’s) corresponding to the soft and the hard segment. Adding a small amount of tethered clay shifts Tg for both segments by 44 °C and 13 °C, respectively, while adding clay from 1 to 5 wt.% results in increasing the thermal stability of TPU composite from 12 to 34 °C, respectively. The differential scanning calorimetry (DSC) was used to investigate the phase structure of PU dispersion, showing an increase in thermal stability, solubility, and flexibility. Regarding the electrical properties, the maximum piezoresistivity (10 S/m) of 7.4 wt.% MWCNT was enhanced by 92.92%. The chemical structure of the PU–CNT composite has shown a degree of agglomeration under disruption of the sp2 carbon structure. However, with extended graphene loading to 5.7 wt.%, piezoresistivity could hit 10-1 S/m, less than 100 times that of PU. In addition to electrical properties, the acoustic behavior of MWCNT (0.35 wt.%)/SiO2 (0.2 wt.%)/PU has shown sound absorption of 80 dB compared to the PU foam sample. Other nanofillers, such as SiO2, TiO2, ZnO, Al2O3, were studied showing an improvement in the thermal stability of the polymer and enhancing scratch and abrasion resistance.

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“…Oxime carbamate bond (oxime‐urethane unite), as one of the most used blocked isocyanates in the coating field, is prepared by the reaction of isocyanates and hydroxyl. It is stable at room temperature and can reversibly generate free isocyanates and oxime groups at elevated temperature 31,32 . Simultaneously, the source materials is easy to obtain.…”

Section: Introductionmentioning

confidence: 99%

Multi‐functional polyurethane composites with self‐healing and shape memory properties enhanced by graphene oxide

Luo

Guo

et al. 2021

J of Applied Polymer Sci

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Development of shape memory polymer materials with integrated self-healing ability, shape memory property, and outstanding mechanical properties is a challenge. Herein, isophorone diisocyanate, polytetramethylene ether glycol, dimethylglyoxime, and glycerol have been used to preparation polyurethane by reacting at 80 C for 6 h. Then, graphene oxide (GO) was added and the reaction keep at 80 C for 4 h to obtain polyurethane/GO composite with selfhealing and shape memory properties. Scanning electron microscopy shows that the GO sheets were dispersed uniformly in the polyurethane matrix. The thermal stability was characterized by thermogravimetric analyses. The tensile test shows that the Young's modulus of the composites increases from 38.57 ± 4.35 MPa for pure polyurethane to 95.36 ± 10.35 MPa for the polyurethane composite with a GO content of 0.5 wt%, and the tensile strength increases from 6.28 ± 0.67 to 15.65 ± 1.54 MPa. The oxime carbamate bond and hydrogen bond endow the composite good self-healing property. The healing efficiency can reach 98.84%. In addition, the composite has excellent shape memory property, with a shape recovery ratio of 88.6% and a shape fixation ratio of 55.2%. This work provides a promising way to fabricate stimulusresponsive composite with versatile functions.

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Strong, detachable, and self-healing dynamic crosslinked hot melt polyurethane adhesive

Abstract: A dynamic oxime–carbamate based polyurethane hot melt adhesive was developed with outstanding adhesion performance to multiple substrates, and detachable and self-healing properties.

Cited by 104 publications

References 33 publications

Self-healing polyurethane-elastomer with mechanical tunability for multiple biomedical applications in vivo

Self-healing polyurethane-elastomer with mechanical tunability for multiple biomedical applications in vivo

Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

Multi‐functional polyurethane composites with self‐healing and shape memory properties enhanced by graphene oxide

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