Polyurethane/polyhydroxyurethane hybrid polymers and their applications as adhesive bonding agents

Abstract

A polyurethane/polyhydroxyurethane (PU/PHU) hybrid polymer was synthesized by reaction of a cyclic-carbonate-terminated prepolymer with triethylenetetramine without employing isocyanates in the final curing step. This cured elastomer contains traditional urethane linkages from the initial prepolymer reaction as well as hydroxyurethane linkages from the final chain extension reaction. The PU/PHU hybrid exhibits microphase separation as made apparent by the presence of two glass transitions and elastomeric properties with Young's modulus of 37 MPa and strain at break of 350 %. Most importantly, the PU/PHU hybrid polymer exhibits adhesion to polyimide, poly(vinyl chloride) (PVC), and aluminum substrates that is similar to or enhanced relative to those of polyurethane controls and literature values for typical polyurethane adhesives. In particular, the PU/PHU hybrid has T-peel forces of 7.8, 10.5, and 3.4 N/mm on polyimide, PVC, and aluminum, respectively, and undergoes predominately adhesive failure rather than cohesive failure. The application of this material as a model consumer-applied adhesive for potential replacement of isocyanate-based polyurethanes is also briefly discussed.

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

“…These PHU materials are also thermoplastics, and thus can be easily processed and molded into a range of shapes or forms to tailor to different applications. Future studies are warranted to consider other applications for which PHUs may possess advantages over conventional polyurethanes, including as adhesives [97].…”

Cellulose nanocrystals reinforced environmentally-friendly waterborne polyurethane nanocomposites

“…Furthermore, varying segment content as well as the composition and nature of the reagents, different polyurethanes can be tailored (Tharcis, Badel, Jéol, Fleury, & Méchin, 2016). In this way, different soft and hard segments molecular architectures, both crystalline and amorphous, can be obtained, leading to polyurethanes with diverse properties, opening the way for a wide range of applications such as coatings, adhesives, or in printing or medicine (Leitsch, Heath, & Torkelson, 2016;Mao et al, 2015;Mo et al, 2015;Si et al, 2016). Recently, the increase of global environmental awareness, the aim of reducing organic volatile compounds and the guidelines to tackle climate change, have promoted the research focused on waterborne systems ("Framework convention on climate change," 2015).…”

Polymers Based on Cyclic Carbonates as Trait d'Union Between Polymer Chemistry and Sustainable CO2 Utilization

“…[189] The latter were evaluated for their adhesion to variouss ubstrates such as polyimide, PVC, and aluminum substrates and compared with standardP Us. [189] The latter were evaluated for their adhesion to variouss ubstrates such as polyimide, PVC, and aluminum substrates and compared with standardP Us.…”

“…Adhesive properties of PHUs can be controlled by preparing hybrid PU/PHU polymers.I ndeed, ac yclic carbonate-capped PU prepolymerp repared by standard isocyanate chemistry was reactedw ith triethylenetetraamine (TETA) to yield PU/PHU hybrid polymers. [189] The latter were evaluated for their adhesion to variouss ubstrates such as polyimide, PVC, and aluminum substrates and compared with standardP Us. Measured Tpeel forces for the synthesized PU/PHU hybrid were 7.8, 10.5 and 3.4 Nmm À1 for polyimide, PVC, anda luminum, respectively.T hese resultss uggestt hat PU/PHU hybrid polymers could exhibit better or comparable adhesive properties than the PU standards.…”