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

Abstract

Biodegradable cationic waterborne polyurethanes (WPUs) were successfully prepared using poly(caprolactone) diol as the soft segment. To improve the mechanical performance, adhesive strength and water resistance of the WPU films, different amounts of trimethylol propane monooleate (TMPM) containing biodegradable long-branched aliphatic chains were incorporated in the PU structure. The T-peel strength of WPU-3 reached 42.8 N/25 mm, which was about 324% higher than that of WPU (10.1 N/25 mm) without TMPM. On the other hand, the elongation at break of WPU-5 was 811%. On enhancing the TMPM content from 0 to 7.8 wt %, the surface tension decreased from 53.6 to 41.5 mN/m and the water contact angle of the WPU films increased from 52.4 to 81.0 , whereas the water absorption was observed to decrease from 15.6% to 9.6%. The fracture mechanism of the WPU films transformed from the brittle failure to the ductile fracture. The experiment results showed the cationic WPU modified by TMPM displayed excellent film-forming property flexibility and adhesion, the surface tension of WPU dispersion and crystallinity of the resulting film were significantly reduced. For the first time, a biodegradable cationic WPU has been prepared by modification with TMPM, which can be employed for constructing the eco-friendly biodegradable cationic WPUs.

High‐temperature resistance and excellent electrical insulation in epoxy resin blends

“…At the same time, with the increase in temperature, the molecular chain of epoxy resin intensifies, carriers move faster, and the corresponding dielectric constant and dielectric loss will increase. Because power components need low dielectric constant and low dielectric loss, 44,45 the reasonable ratio of the two epoxy resins can make up for each other's shortcomings. The comprehensive comparison shows that the dielectric constant of EP55 can be kept at about five at all temperatures while the dielectric loss was kept at a relatively low level.…”

The synergetic effect of bis(2‐hydroxyethyl) terephthalate from glycolysis of poly(ethylene terephthalate) on the intumescent flame retardancy of waterborne polyurethane

“…According to the previous research of our group, 31,32 BHET was obtained according to the following scheme. Briefly, PET waste and EG were mixed at a mass ratio of 1:4 with 5 wt% (referring to the mass of PET) of zinc acetate.…”

Antibacterial and Alkali-responsive Cationic Waterborne Polyurethane Based on Modification of Aloe Emodin

“…Due to the principle of magnetic homogeneous repulsion, it has anti-dust effect. Aloeemodin is a natural herbal extract that causes little harm to the environment when it degrades [18] .…”