The physical and mechanical properties of polyurethanes from oleic acid polyols

Abstract

Three different polyester polyols, with various oleic acid content, were used in the preparation of polyurethane (PUR) coatings. The polyols were designated as Alk28, Alk40, and Alk65, in which 28, 40, and 65 represent the percentage of oleic acid of the polyol formulations. These polyester polyols were reacted with aromatic diisocyanate [toluene diisocyanate (TDI)] to form PUR coatings. The acid value, hydroxyl value, molecular weight, and viscosity of the polyols have been determined. The reaction between the polyols and TDI was studied by Fourier Transform Infrared spectroscopy and X-ray diffraction (XRD).The effects of varying NCO/OH ratio and oleic acid content of polyols on physical and mechanical properties of PUR films were studied. XRD results indicate that the samples are amorphous. PURs, made with Alk28, have the best mechanical properties followed by Alk40 and Alk65. The mechanical properties of the samples have increased as the NCO/OH ratio was increased from 1.2 to 1.6.

Effect of danling chain content on properties of 10-undecenoic acid-based polyurethane

“…In comparison, the content of dangling chain has a little impact on the thermal stability of the obtained PUs. We can see from Fig.3, the polyurethane prepared all has 3 thermal decomposition stage, respectively for the decomposition of carbamate bond [12,13] , soft segment decomposition and decomposition of ester bond [7] . Fig.4.…”

“…When the danling chain is introduced into the polymer, the arrangement regularity between molecules will be disturbed so as to reduce the intermolecular stacking. So the glass transition temperature and the melting temperature of the polyurethane can be reduced [7,8] . When the vegetable oil with 6-18 C atoms chain react with the isocyanate, the introduction of dangling chain in the polyurethane will be realized.…”

Effect of oleic acid content and chemical crosslinking on the properties of palm oil‐based polyurethane coatings

“…19,20 Three different formulations of alkyd polyols were synthesized by using 28, 40, and 65% oleic acid and were named Alk28, Alk40, and Alk65, respectively. The synthesis of polyols from oleic acid and polyurethane has been described previously.…”

“…The existence of a single T g for each sample suggests that there were less visible phase separations between the soft and hard domains. 20 . 19 .…”

Study of Thermal Decomposition Kinetics of Palm Oleic Acid-Based Alkyds and Effect of Oil Length on Thermal Stability

“…Alkyd resins, being in this category, are important area in the industry, as one can just design alkyds by changing the oil length and subjected them to suitable physical or chemical modifications for various potential applications such as surface coating, adhesive, printing ink, fibers and temperature resistant performance materials pneumatic tire and so on [1][2][3][4][5][6][7]. However, some health problems may arise from thermal decomposition of the materials due to evolution of some toxic products.…”