Slip and momentum transfer mechanisms mediated by Janus rods at polymer interfaces. Issue 28 (6th July 2020)

• Record Type: Journal Article
• Authors: Paiva, Felipe L.; Secchi, Argimiro R.; Calado, Verônica; Maia, João; Khani, Shaghayegh
• Is Part Of: Soft matter. Volume 16:Issue 28(2020)
• Page Start: 6662
• Page End: 6672
• Publication Date: 2020-07-06
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/d0sm00858c
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : Janus rods interfacially grafted with longer polymers penetrate homopolymer phases and yield less effective momentum transfer across the interface. Abstract : As an incipient but preeminent technology for multiphase nanomaterials/fluids, exact compatibilizing mechanisms of Janus particles in polymer blends and the consequent morphology remain unknown. The contributions of Janus nanorods to slip suppression and momentum transfer across the interface have been explored through dissipative particle dynamics simulations under shear flow at unentangled polymer–polymer interfaces. Rods have been then grafted with flexible polymer chains to unveil interfacial structure–property relationships at a molecular level when compared with flexible diblock copolymer surfactants. When Janus rods are sparsely grafted with necessarily longer grafts, they favor a greater degree of graft interpenetration with polymer phases. This yields less effective momentum transfer that impacts droplet coalescence processes; dynamic heterogeneities at complex interfaces; and helps map their efficiency as compatibilizers.