A thermal self-healing polyurethane thermoset based on phenolic urethane

Cao, Shan; Li, Shouhai; Li, Mei; Xu, Lina; Ding, Haiyang; Xia, Jianling; Zhang, Meng; Huang, Kun

doi:10.1038/pj.2017.48

Cited by 83 publications

(71 citation statements)

References 37 publications

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“…In cases catalyzed by DBTDL, it is clear that the reactivity of phenolic hydroxyls with isocyanates are reduced seriously by phenyls compared to those of aliphatic ones, and electron‐withdrawing substituents aggravate the trend further. These results conform to the traditional views,11–13,21 and decrease the bond‐exchange efficiency inevitably. Unexpectedly, BDMAEE which is ineffective for aliphatic hydroxyls plays an obvious role for phenolic hydroxyls.…”

Section: Resultssupporting

confidence: 89%

“…In summary, we can confirm that the excellent dynamic performance of BPCB results from the extremely high rates of both forward and reverse reactions due to BDMAEE catalyst and bromine substitutes. However, the effects of forward reaction rate are rarely focused on in previous related reports 12–15. To confirm the viewpoint, a series of PU‐TBBPA (x, y) (“x” refers to the catalyst used in the experiment and “y” refers to the amount of catalyst (g)) were prepared by the same methods except for the different catalytic conditions (Figure 3d).…”

Section: Resultsmentioning

confidence: 98%

“…In addition, electron‐withdrawing substituents could promote the reverse reaction further. Several cases have been reported to prepare dynamic PU thermosets utilizing phenols 11–16. Very recently, Han et al14 reported self‐healable PU based on tetrabromobisphenol A (TBBPA) without catalysts.…”

Section: Introductionmentioning

confidence: 99%

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A Transparent, High Refractive, Shape‐Memory, Healable, and Recyclable Phenolic Polyurethane Thermoset: Unexpected Roles of Bromine Substituents and Tertiary Amine Catalysts

Bai

Jiao

2020

Macro Chemistry & Physics

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The applications of polyurethane (PU) thermosets are limited by the lack of plasticity after curing due to permanent crosslinks. Besides, the low refractive index is insufficient for optical devices. Here, a transparent, high refractive, recyclable, and healable PU thermoset is developed based on dynamic bromined phenyl‐carbamate bonds (BPCB). It exhibits tensile strength of ≈52 MPa, good shape‐memory ability, and can be reprocessed or healed nearly completely at 110 °C in 30 min. Tertiary amine catalysts and bromine substituents jointly play unexpected roles to promote the forward and reverse reactions significantly, leading to high bond‐exchange efficiency of BPCB. Furthermore, the introducing of BPCB can endow the material with higher refractive index (nD = 1.5850) simultaneously. In summary, this material is of potential as dynamic PU thermoset in various fields, especially in advanced optical devices.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 98%

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A Transparent, High Refractive, Shape‐Memory, Healable, and Recyclable Phenolic Polyurethane Thermoset: Unexpected Roles of Bromine Substituents and Tertiary Amine Catalysts

Bai

Jiao

2020

Macro Chemistry & Physics

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“…However, the only slight increases in DC at Rp max (3–5%) is not sufficient to explain stress reductions of about 10–20% between methacrylate and thiourethane fillers, within the same filler type. Active strand behavior on the thiourethane functionalized particles may also have played a role . In simple terms, the presence of the low T g thiourethane oligomer on the filler surface may have helped relieve some of the stress, and also may have been responsible for some of the mechanical properties observations.…”

Section: Resultsmentioning

confidence: 99%

Impact of thiourethane filler surface functionalization on composite properties

Faria-e-Silva

Santos

Girotto

et al. 2019

J of Applied Polymer Sci

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Thiourethane oligomers added to methacrylate matrices improve fracture toughness and reduce polymerization stress. In this study, the oligomers are added to the surface of inorganic fillers in the formulation of resin composites. Systematically varied fillers treated either with the thiourethane or a methacrylate silane control are tested. Thiourethane reduces the rate of polymerization of light‐cured composites but does not affect the final degree of conversion. Filler functionalization with thiourethane increases the depth of polymerization, in filler type‐dependent fashion. Thiourethane reduces the polymerization stress for all fillers. The findings suggest that this approach results in the same general effects with the addition of thiourethanes directly to the matrix. This is accomplished with a lower overall concentration of thiourethane, and with no prejudice to the handling characteristics of the material. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47687.

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“…Sound absorption of polyurethane foam has been improved by adding nano clay, titania nanoparticles multi-walled carbon nanotubes (MWCNTs) in recent studies [11][12][13]. On the other hand, present studies are focused on certain aspects for which further investigations are needed.…”

Section: Introductionmentioning

confidence: 99%

Acoustic properties of polyurethane compositions enhanced with multi‐walled carbon nanotubes and silica nanoparticles

Yıldırım

Sancak

Navidfar

et al. 2018

Materialwissenschaft Werkst

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In this study, in order to enhance acoustic properties of polyurethane (PU) foams multi‐walled carbon nanotubes (MWCNT) and/or silica nanoparticles were added to polyol‐isocyanate composition up to 2 wt%, and acoustic properties of polyurethane foam samples with small amount of carbon nanotubes and silica nanoparticles (spherical and/or amorphous types) were determined in the frequency range from 50 Hz up to 6400 Hz. Acoustic properties, especially absorption coefficient of the produced samples were measured for all the prepared samples and results were investigated to come up with the best polyurethane samples that can be applied for sound absorption application at the desired frequency range. It was found that double combination of carbon nanotubes and silica nanoparticles, especially 0.7 wt% carbon nanotubes and 0.2 wt% spherical silica nanoparticle added polyurethane composition has better sound absorption ratio overall all frequencies levels compared to the other samples. Thus, it is possible to obtain polyurethane nanocomposite with a higher amount of carbon nanotube by weight at the same time enhancing sound absorption properties. Moreover, there is a synergic effect between carbon nanotubes and silica nanoparticles when mixed and added into polyurethane matrix at predetermined levels to get enhanced acoustic response with a higher level of carbon nanotube in polyurethane foam.

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A thermal self-healing polyurethane thermoset based on phenolic urethane

Cited by 83 publications

References 37 publications

A Transparent, High Refractive, Shape‐Memory, Healable, and Recyclable Phenolic Polyurethane Thermoset: Unexpected Roles of Bromine Substituents and Tertiary Amine Catalysts

A Transparent, High Refractive, Shape‐Memory, Healable, and Recyclable Phenolic Polyurethane Thermoset: Unexpected Roles of Bromine Substituents and Tertiary Amine Catalysts

Impact of thiourethane filler surface functionalization on composite properties

Acoustic properties of polyurethane compositions enhanced with multi‐walled carbon nanotubes and silica nanoparticles

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