Properties of crosslinked polyurethanes obtained by acrylic side‐group polymerization and of their blends with various plant oils

Abstract

Novel polyurethane elastomers have been developed to incorporate plant oil into their matrix. Bisphenol A glycerolate diacrylate was used as a chain extender for the polyurethane prepolymer obtained from poly(tetramethylene oxide) glycol and 1,6hexane diisocyanate. The curing of the polyurethane acrylate matrix in the presence of the plant oil results in a network matrix which includes renewable resources in their structure. The effects of the inclusion of different vegetable oil (such as soybean oil, rapeseed oil, cotton oil, or sunflower oil) into the crosslinked polyurethane acrylates matrix were studied by evaluating various properties of the films such as the thermal behavior, the tensile properties, and the surface properties. The increases in chain extender content determine an increase of the thermal stability (the 10% weight loss decomposition temperatures increase from 325 to 375 C) and mechanical strength (from 3 to 9 MPa). Contact angle measurements have shown that the hydrophobic property of the films surface slightly increased with the incorporation of plant oil into the crosslinked polyurethane matrix. In addition, polyurethane/plant oil blends exhibit enhanced mechanical strength (from 3 to 9.8 MPa), as well as an increased roughness reaching a maximum average (113 nm) in the case of cotton oil. All polyurethane/plant oil blend present higher values for glass transition temperature and slightly enhanced values for thermal stability.

A renewable approach toward the development of mahua oil‐based wood protective polyurethane coatings: Synthesis and performance evaluation

“…From the data, it is observed that contact angle slightly increases as crosslink density of cured films increases from the cured system. However, the major factor governing the contact angle was the hydrophobic nature of vegetable oil in all these cured films and the results are comparable to other vegetable oil based PU coatings …”

“…However, the major factor governing the contact angle was the hydrophobic nature of vegetable oil in all these cured films and the results are comparable to other vegetable oil based PU coatings. 34,36 WA of the polymer is directly related to their free volume fraction, chemical composition, crosslink density, and presence of polar groups capable to form hydrogen bonds with water molecules. The results of WA test are mentioned in Table III.…”

Green polyurethane from dimer acid based polyether polyols: Synthesis and characterization

“…One of the most frequently used renewable raw materials are cashew nut shell liquid for getting polyols . Vegetable oil has also been blended to prepared polyols as a starting material for Pus . Petrovic et al have reported the preparation of rigid type PUs from soybean oil .…”

“…12,13 Vegetable oil has also been blended to prepared polyols as a starting material for Pus. 14,15 Petrovic et al have reported the preparation of rigid type PUs from soybean oil. 16 There are several reports available on the PUs based on soybean oil, castor oil, nahar seed oil, rape seed oil, and plam oil.…”

Biobased reactive diluent for UV-curable urethane acrylate oligomers for wood coating

“…The thermal stability of 20 and 25 wt% TFFA-based polymer is higher than 5, 10, and 15 wt% TFFA-based polymer between the temperatures 250-380°C, due to the higher crosslinking The crosslinking increases the thermal stability of the polymer. 26,27 The disruption of urethane bonds causes decomposition of hard segments and thermally stable amide linkages correspond to the temperature 280-320°C. 28,29 Gloss of UV-cured coating…”