Abstract
Abstract Waterborne polyurethane resins (WPUs) were prepared from polytetramethylene ether glycol (PTMG) and PTMG/polyhydric alcohol liquefied lignin (LL) with isophorone diisocyanate (IPDI), and ethylenediamine (EDA) and 1,4-butanediol (1,4-BD) were used as chain extenders. The effects of LL and the kind of chain extender on the properties of the WPU suspensions and dried films were studied. WPU suspensions prepared with PTMG/LL as the polyol had higher viscosity and larger average particle dimension than those with PTMG alone. WPU films prepared with EDA as the chain extender had higher tensile strength with less tensile deformation. LL can enhance the stiffness of WPU films, but the breaking deformation decreases. Dynamic mechanical analyzer (DMA) results showed that the main effect of LL was reduced thermal activity of the soft segment. Thermogravimetric analyzer (TGA) results showed WPU films prepared with EDA as the chain extender had better heat-resistance than those with 1,4-BD.
Highlights
Thermal plastic polyurethane (TPU) is a linear polymer prepared by reacting a diol with a diisocyanate, generally in two steps
Waterborne polyurethane resins (WPUs) suspensions prepared with polytetramethylene ether glycol (PTMG)/liquefied lignin (LL) as the polyol had higher viscosity and larger average particle dimension than those with PTMG alone
WPU suspensions prepared with 1,4-BD as the chain extender had a pH value of 6.7, while those prepared with EDA had weak basic suspensions
Summary
Thermal plastic polyurethane (TPU) is a linear polymer prepared by reacting a diol with a diisocyanate, generally in two steps. Films prepared with a higher NCO/OH ratio had better solvent resistance and mechanical strength because of the additional urea and amide structure. Kwak et al (2003) showed that the kind of neutralizer and chain extender used influences the properties of WPUs. Films prepared with a higher NCO/OH ratio had better solvent resistance and mechanical strength because of the additional urea and amide structure. Kwak et al (2003) showed that the kind of neutralizer and chain extender used influences the properties of WPUs They pointed out using trimethylamine as the neutralizer and 1,4-butane diamine as the chain extender gave the PU films higher thermal stability, glass transition temperature, tensile strength and storage modulus
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
