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

Abstract

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.

Synthesis and characterization of waterborne polyurethane emulsions based on poly(butylene itaconate) ester

“…Thus, the introduction of TMP decreased the free volume of WPU chains, resulted in the interaction between backbone chains increased. [29] There was hydrogen bond between urethane bonds, the amount of urethane bonds increased with the introduction of TMP, to a certain degree, which prevented molecules from sliding, and therefore, made the T g shift to a high temperature. As shown in Figure 12, T g of the crosslinked sample was increased by about 11 °C.…”

Effect of phase separation on water resistance of green waterborne polyurethanes: Unexpected stronger impact compared to hydrophilic segments

“…Bai and the coworkers synthesized a UV‐curable WPU, and the result showed that the water absorption rate of WPU films increased with the increase of the content of DMPA and the decrease of the cross‐linking density of WPU molecular chains . Lei et al . reported a WPU with long‐branched aliphatic chains; and these hydrophobic chains improved the water resistance of WPU films according to the study.…”

“…[15][16][17][18] Waterborne PUs (WPUs) are one of the most prosperous branches of polymer materials because of their adjustable molecular structures, excellent properties such as low-temperature resistance, high tensile strength, and high flexibility, and environmentally friendly characteristic compared with solvent-borne PUs. [31] Lei et al [32] reported a WPU with long-branched aliphatic chains; and these hydrophobic chains improved the water resistance of WPU films according to the study. [24][25][26][27] As materials used mainly in daily life, WPUs always contact water or moisture in their application.…”

Role of the interactions between carbonate groups on the phase separation and properties of waterborne polyurethane dispersions prepared with copolymers of polycarbonate diol

“…PUD consists in linear thermoplastic the ionic groups [2]. Recent studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] demonstrated that the ionic group content, solids content, segmented structure, molecular weight of the polyol, the type of chain extender and the hard/soft segments ratio determined the PUDs properties. However, there are few studies dealing with the influence of the composition of copolymers of polycarbonate diol on the properties of the polyurethanes [21][22][23][24][25] and, to the best of our knowledge, there are few publications dealing with polyurethane dispersions [22,26,27].…”