Thermosetting polyurethanes prepared with the aid of a fully bio-based emulsifier with high bio-content, high solid content, and superior mechanical properties

Liu, Lingxiao; Lu, Jingyi; Zhang, Yi; Liang, Huaping; Liang, Dunsheng; Jiang, Jizhou; Lu, Qi; Quirino, Rafael L.; Zhang, Chaoqun

doi:10.1039/c8gc03560a

Cited by 98 publications

(56 citation statements)

References 34 publications

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“…The conversion of C C was calculated by the intensities of 1 HNMR peaks appeared at about 5.35 and 5.59 ppm. 16,18 The temperature has a great influence on the conversion of C C . 19 In Figure S1, the C C conversion reached 80% with cooling (at 0 C), while the conversion was below 75% without cooling (the reaction system reached ca.…”

Section: Characterization Of Modified Castor Oilmentioning

confidence: 99%

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Preparation and characterization of modified castor oil via photo‐click chemistry forUV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

Dai

Song

Zhang

2020

J of Applied Polymer Sci

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A castor oil (CO) was modified via thiol-ene click chemistry reaction between CO and 3-mercaptopropyl trimethoxysilane, with the conversion of C C bonds of CO over 99% based on 1 HNMR spectra. The obtained modified castor oil (MCO) was used as a biobased polyol to prepare waterborne polyurethane (WPU) dispersions. The modification of CO exhibited a great effect on the properties of WPU dispersions and coatings, and an obvious change is the improvement of the water resistance of WPU coatings. WPU dispersions with MCO had good storage stability. A WPU coating with 7% MCO had high surface hydrophobicity, and its water absorption was as low as 3.2%. Conductive carbon black filled WPU coatings with MCO were cured by efficient UV radiation, and their conductive percolation threshold could decrease to 0.76%, which could be attributed to the well filler dispersion and strong filler-polymer interaction. The WPU dispersions are ecofriendly, and can be used to produce biobased WPU coatings with a great application potential in antistatic coating fields.

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Section: Characterization Of Modified Castor Oilmentioning

confidence: 99%

“…The surface hydrophobicity of WPU coatings containing the biobased polyol was stronger than that of WPU coatings containing petroleum‐based polyols. 16 …”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of modified castor oil via photo‐click chemistry forUV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

Dai

Song

Zhang

2020

J of Applied Polymer Sci

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“…In the second stage, the weight of ChNFs suddenly drops by 30% from 280 ° C to 410 ° C, this is caused by small molecular fragments such as OH and CH 2 OH groups. The last step essentially involves the decomposition of chitin backbone between 410 ° C and 600 ° C . In relation to the PPy, there was a relatively steady decrease in mass loss due to polymer chain degradation.…”

Section: Resultsmentioning

confidence: 99%

Polypyrrole‐decorated, milled carbon fibers‐inserted chitin nanofibers/multiwalled carbon nanotubes flexible free‐standing film for supercapacitors

Jiang

Chen

2019

Polymer Composites

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A flexible free-standing film was fabricated using interconnected chitin nanofibers (ChNFs) and multiwalled carbon nanotubes (MWCNTs) as a conductive substrate, by inserting in milled carbon fibers (MCFs) to increase the number of holes and decorating it with polypyrrole (PPy) to improve the capacitance. The synthesis process for the ChNFs/MWCNTs/MCFs/PPy (CMMP) film was simple and effective, for which the 3D structure of ChNFs/MWCNTs/MCFs (CMM) film was first fabricated through vacuumfiltration followed by adding PPy on the surface of CMM film via in situ polymerization.Field emission scanning electron microscopy showed that the CMMP film had a porous structure similar to aerogel, which was caused by the great size difference between ChNFs/MWCNTs and MCFs. Furthermore, the CMMP film had a high specific capacitance of 362 F g −1 at a scan rate of 5 mV s −1 in 1 mol L −1 sulfuric acid, excellent cycling stability with a retention of 86.6% after 5000 cycles at 2 A g −1 , and good thermal stability with a 77% mass residue at 600 C at the mass ratio of 1:1:0.5:13.38 (Py: 5 mmol). In general, this environmentally-friendly, simple-synthesis, high-performance CMMP film could be widely used in the flexible all-solid-state supercapacitor field. K E Y W O R D Schitin nanofibers, milled carbon fibers, multi-walled carbon nanotubes, polypyrrole, supercapacitor electrode

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“…Therefore, water molecules cannot quickly enter the interior of the membrane, thereby enhancing the hydrophobicity of the membrane. [8] However, excessive CO ratio will lead to excessive crosslinking of the polymer, which will have a more significant impact on the regularity of molecular chain and the degree of separation of soft and hard phases. These are not conducive to improving the hydrophobicity of the film, so the contact angle of the film is reduced.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

“…Most of these volatile organic compounds (VOC) and harmful air pollutants (HAP) are released into air, leading to serious health problems to producers and users. [7,8] Under the circumstance of paying attention to environment protection and reducing the VOC and HAPs, environmentally friendly WPU is rapidly developing globally, aiming to partially or entirely replace solvent-based PUs for application. WPU can avoid burning or explosion during the preparation, storage, transportation, and painting process, which largely meets the urgent demands of safety and environmental protection.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Castor Oil‐Based Waterborne Polyurethane with Improved Properties via Adjusting PBA/CO Soft Segment Ratio

et al. 2020

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In this study, dimethylol propionic acid (DMPA) and ethoxylated polymer diol (N120) are incorporated as composite hydrophilic groups to synthesize a series of castor oil‐based waterborne polyurethane (CWPU) nano‐emulsions. The properties of the nano‐emulsions with different ratio of polybutylene adipate (PBA) and castor oil (CO) soft segments as well as their film are investigated systematically. Fourier infrared spectroscopy (FTIR) confirms that CO was successfully introduced into the waterborne polyurethane (WPU) structure. The result indicates that the maximum contact angle of the film is 75.51° with a 7/3 molar ratio of PBA/CO. Thermal Gravimetric Analyzer (TGA) and Dynamic thermomechanical analysis (DMA) tests show that the thermal stability of the films has gradually improved with the increase of castor oil content. The content of castor oil in CWPU also affects the mechanical properties of the film. The tensile strength of the film reaches 23.2 MPa, and the elongation at break is 1460.7 %, when the molar ratio of PBA/CO is 9/1. Atomic force microscopy (AFM) is used to express the surface morphology of CWPU films. The films surface become rougher due to the introduction of CO. This work combines castor oil and water‐based systems to provide a relatively simple preparation method to synthesize CWPU nano‐emulsions, which can be used in environmental protection coatings and adhesives, and has broader application prospects.

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Thermosetting polyurethanes prepared with the aid of a fully bio-based emulsifier with high bio-content, high solid content, and superior mechanical properties

Abstract: The green synthetic route developed in this study offers a new platform for environmentally friendly emulsifiers for waterborne polyurethanes.

Cited by 98 publications

References 34 publications

Preparation and characterization of modified castor oil via photo‐click chemistry forUV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

Preparation and characterization of modified castor oil via photo‐click chemistry forUV‐curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

Polypyrrole‐decorated, milled carbon fibers‐inserted chitin nanofibers/multiwalled carbon nanotubes flexible free‐standing film for supercapacitors

Synthesis of Castor Oil‐Based Waterborne Polyurethane with Improved Properties via Adjusting PBA/CO Soft Segment Ratio

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