Preparation and characterization of castor oil‐based waterborne polyurethane crosslinked with 2‐amino‐2‐(hydroxymethyl)‐1,3‐propanediol

Abstract

Crosslinked castor oil (CO)‐based waterborne polyurethane was synthesized from CO, polycarbonate diol, isophorone diisocyanate, 2,2‐dimethylol propionic acid, and 2‐amino‐2‐(hydroxymethyl)‐1,3‐propanediol (THAM) using pre‐polymer process. Fourier transform infrared spectroscopy, X‐ray diffraction, and transmission electron microscopy were utilized to characterize the above‐synthesized polyurethane. The effect of THAM content was studied on particle size, zeta potential, thermogravimetric analysis, differential scanning calorimetry, tensile tests, and contact angle measurement. Results showed that, with the increase of THAM content, the particle size increases and the thermal stability increases. Furthermore, as the THAM content increased from 0% to 1.5%, tensile strength increased from 9.5 to 16.3 MPa, contact angle increased from 67.8° to 87.4°, and bibulous rate decreased from 13.4% to 6.1%, the elongation at break dropped from 154.8% to 37.9%, respectively. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45532.

Synthesis of Castor Oil‐Based Waterborne Polyurethane with Improved Properties via Adjusting PBA/CO Soft Segment Ratio

“…It may be that the degree of hydrogen bonding of À NH and À C=O bonds in WPU is higher, and the intermolecular force is enhanced. [39,40] CWPU1 (the molar ratio of PBA/CO is 9/1) has a weak crystallization peak at 21.9°. With the increase of CO in the soft segment, CWPU2 ∼ CWPU6 possess broad peaks, demonstrating that the soft segment is in a microcrystalline state and the crystallization ability is low.…”

“…The WPU whose soft segment is all PBA showed sharp diffraction peaks at 21.7° and 22.5°, indicating that there was obvious crystallization in the soft segment. It may be that the degree of hydrogen bonding of −NH and −C=O bonds in WPU is higher, and the intermolecular force is enhanced [39,40] . CWPU1 (the molar ratio of PBA/CO is 9/1) has a weak crystallization peak at 21.9°.…”

Sustainable and Robust Superhydrophobic Cotton Fabrics Coated with Castor Oil-Based Nanocomposites for Effective Oil–Water Separation

“…The presence of the hydroxyl groups and unsaturated double bonds in CO offers active locations for executing various chemical reactions, such as esterification, dehydration, polymerization, and so on. As a consequence, the unique structure of CO makes it appropriate for a wild variety of applications, including paints, coatings, and lubricants. − However, the fabrication of SHBOI coatings using CO as the starting material for oily water treatment has been a challenge.…”