Influence of the Surface Chemistry of Graphene Oxide on the Structure-Property Relationship of Waterborne Poly(urethane urea) Adhesive.

ABSTRACT: Small amounts-0.04 wt.%-graphene oxide derivatives with different surface chemistry (graphene oxide-GO-, amine-functionalized GO-A-GO-, reduced GO-r-GO) were added during prepolymer formation in the synthesis of waterborne poly(urethane urea) dispersions (PUDs). Covalent interactions between the surface groups on the graphene oxide derivatives and the end NCO groups of the prepolymer were created, these interactions differently altered the degree of micro-phase separation of the PUDs and their structure-properties relationships. The amine functional groups on the A-GO surface reacted preferentially with the prepolymer, producing new urea hard domains and higher percentage of soft segments than in the PUD without GO derivative. All GO derivatives were well dispersed into the PU matrix. The

SUBMITTER: Tounici A 

PROVIDER: S-EPMC8399831 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature