Preparation and properties of water‐borne polyurethane with branched straight aliphatic chains

Liu, Fang; Han, Dong

doi:10.1002/app.33689

Cited by 9 publications

(5 citation statements)

References 33 publications

(40 reference statements)

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“…The hydrophobic long aliphatic chain with a low polarity migrated easily to the surface of the WPU film, and thereby, the surface free energy of the WPU film decreased, and the film could not be easily wetted. This phenomenon was also reported in previous literature . The water absorption is an important parameter for the practical applications of a polymer.…”

Section: Resultssupporting

confidence: 86%

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Synthesis and adhesion properties of waterborne polyurethane dispersions with long‐branched aliphatic chains

Liu

Xia

Lin

et al. 2014

J of Applied Polymer Sci

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In this study, a series of waterborne polyurethanes (WPUs) with different contents of long-branched aliphatic chains were synthesized through variation of the amount of diol chain extender trimethylol propane monooleate (TMPM). The effects of the TMPM content on the adhesion properties of the WPUs were investigated in terms of their surface tension, interfacial tension, contact angle, and adhesion strength. Fourier transform infrared and 1 H-NMR spectra demonstrated the successful incorporation of TMPM into the polyurethanes. An increase in the TMPM content produced decreases in the surface tension of the WPUs and the interfacial tension and contact angle between the WPUs and plastic films. This indicated that the wetting properties of the WPUs on the plastic films was improved. The improved wettability enhanced the adhesion strength of the WPUs, and this showed that the long-branched aliphatic chains could effectively improve the adhesion performance of the WPUs on the plastic films. Moreover, TMPM, with its hydrophobic aliphatic chains, increased the hydrophobicity and thermal stability of the WPU films.

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Section: Resultssupporting

confidence: 86%

“…It has been reported that the alkyl side groups in diols or polyols can improve the hydrophobicity and water resistance of WPUs . The side‐chain methyl group (CH 3 ), with its hydrophobic nature, can render a low surface tension to poly(propylene glycol) (PPG)‐based WPUs .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and adhesion properties of waterborne polyurethane dispersions with long‐branched aliphatic chains

Liu

Xia

Lin

et al. 2014

J of Applied Polymer Sci

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“…The regularity of the foam cell structure is reflected by plotting the distribution of the counted cell pore sizes. 38 The foam was evaluated for chemical structure by total reflection mode of Fourier transform infrared (FTIR) spectrometer at 500 ∼ 4000 cm −1 . FTIR spectra were collected by a Nexus 470 FTIR spectrometer (Nicolet, USA) in attenuated total reflectance mode with a subscale of 4 cm −1 and 16 scans for each sample.…”

Section: Experimental Sectionsmentioning

confidence: 99%

A study on coconut fatty acid diethanolamide-based polyurethane foams

2022

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“…According to the order of adding a crosslinker, there are two main types of crosslinking modification: precrosslinking and postcrosslinking . Precrosslinking refers to the addition of multifunctional monomers to crosslink prepolymers during chain expansion or addition of polyfunctional chain extenders during polyurethane emulsification. , However, the main drawback of this modification method is that the viscosity of the prepolymer is too large in the synthesis process, and even a gel phenomenon occurs in some cases. Next, the prepolymer is difficult to disperse during emulsification, so it is difficult to obtain high solid content polyurethane emulsion. − Typical WPU crosslinking agents for WPU include trimethylolpropane, ethylenediamine, etc.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Mechanical and Thermal Properties of Cationic Waterborne Polyurethane by Using an Amino-Rich Multifunctional Macromolecular Crosslinking Agent

Yao

Liu

et al. 2022

Ind. Eng. Chem. Res.

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Due to the low molecular weight of traditional linear waterborne polyurethane (WPU), there are a series of shortcomings in practical application, such as low mechanical properties, poor thermal resistance, and poor water resistance. In this paper, a high-crosslinking cationic waterborne polyurethane emulsion was prepared by using polytetramethylene ether glycol (PTMG) and isophorone diisocyanate (IPDI) as soft segments and hard segments, respectively, castor oil (CO) as a precrosslinking agent, and polyethyleneimine (PEI) as a macromolecular postcrosslinking agent. The effects of the addition amount of PEI on the properties of WPU emulsions and their films were studied. The properties of WPU emulsions were characterized by a viscometer, pH meter, high-speed centrifuge, and laser particle size analyzer. The viscosity of the WPU emulsion is 5–12 mPa·s, the pH is 2.69–3.03, the solid content is about 35%, and the particle size is 80–150 nm. The WPU films were prepared by a casting method. The structures, thermal properties, mechanical properties, and surface wettability of the WPU films were characterized by Fourier transform infrared spectroscopy (FTIR), crosslinking density measurement, thermal gravimetric analysis (TGA), and differential scanning calorimetry (DSC) and by an electronic universal testing machine and contact angle-measuring instrument. The results show that the crosslinking density, thermal stability, contact angle, and tensile strength of WPU films increased with the increase in PEI content, but the elongation at break increased first and then decreased.

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Preparation and properties of water‐borne polyurethane with branched straight aliphatic chains

Cited by 9 publications

References 33 publications

Synthesis and adhesion properties of waterborne polyurethane dispersions with long‐branched aliphatic chains

Synthesis and adhesion properties of waterborne polyurethane dispersions with long‐branched aliphatic chains

A study on coconut fatty acid diethanolamide-based polyurethane foams

Improvement of Mechanical and Thermal Properties of Cationic Waterborne Polyurethane by Using an Amino-Rich Multifunctional Macromolecular Crosslinking Agent

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