The study of cationic waterborne polyurethanes modified by two different forms of polydimethylsiloxane

Abstract

Two kinds of dimethylpolysiloxane, KF-6001 and X-22-176-DX, were used to modify polyurethane.

Tailoring the properties of waterborne polyurethanes by incorporating different content of poly(dimethylsiloxane)

“…with decreasing DMPA content, T gHS of WBPUs increases. These results clearly indicate the existence of microphase separation between PDMS and hard segments, and show that the degree of microphase separation is higher in WBPUs with higher PDMS content [40,41]. Furthermore, storage modulus of WBPUs decreases with decreasing PDMS content at room temperature, indicating that stiffness of prepared films decreases with increasing DMPA/ PDMS molar ratio, i.e.…”

“…with decreasing degree of microphase separation. It is known from the literature that addition of long and flexible PDMS chains in WBPUs decreases values of the storage modulus [41]. However, PDMS used in this work has low molecular weight and therefore relatively short chains, so the primary impact on the G ′ values in this case has the degree of microphase separation.…”

“…As shown in Table 4, tensile strength of WBPU-0.2, WBPU-0.3 and WBPU-0.35 does not differ significantly between each other, and it is slightly higher than tensile strength of other three samples with lower PDMS content (WBPU-0.4, WBPU-0.5 and WBPU-0.7). This is probably due to the presence of lower degree of microphase separation in WBPUs with lower PDMS content [41]. Furthermore, with decreasing PDMS content, elongation at break generally decreases, indicating increase of brittleness.…”

Effect of chain extenders with different functionalities on the properties of single-component waterborne polyurethane ink binders

“…The dried WPU lms (about 1 mm thick) were stored for later use. 20,21 2.4 Material characterization 2.4.1 Fourier transform infrared spectroscopy (FTIR). The chemical structure of the WPU lms was analyzed using FTIR (IS50, Nicolet, USA) at a resolution of 4 cm À1 .…”

Biodegradable cationic waterborne polyurethanes from poly(caprolactone)diol and trimethylol propane monooleate

“…[19][20][21] Moreover, cationic WPUs exhibit unique characteristics, including stability in acidic conditions, antibacterial properties and dust resistance through electrostatic repulsion, thus, making them high value-added materials. [22][23][24][25] Therefore, it is worthwhile to introduce the degradable PCL diols in the cationic WPUs to prepare biodegradable, multifunctional and ecofriendly adhesives. However, PCL is relatively stiff and has a limited flexibility due to its semicrystalline nature.…”