Synthesis and characterization of new poly(ethyleneimine)‐g‐poly(methyl methacrylate) star‐block copolymers with hyperbranched cationic core

Abstract

Hyperbranched polyethyleneimine (hb-PEI) is used as polymeric scaffold to synthesize new PEI-g-polymethylmethacrylate (PEI-g-PMMA) block copolymers, consisting of a hyperbranched, partially quarternized cationic core, and PMMA-arms. The arms are grafted to the PEI scaffold by means of the "grafting to" method. Ammonium groups, covalently bond to the hyperbranched core, provide good adhesion to negatively charged surfaces, even in case of low-surface charges. The PMMA strands provide compatibility of the macromolecules to PMMA matrices, hence generating potential dispersants, and compatibilizers for PMMA. A peculiar association behavior in organic solution is observed as supported by dynamic light scattering and DOSY measurements. First evidences of the applicability of the macromolecules as dispersants to prepare PMMA-nanocomposites are given.

Synthesis of reactive self‐adhesive branched polyurethane dispersant for textile pigment printing

“…Branched polyurethane differentiate themselves from linear polyurethane because of their numerous terminal functional groups 23,24 . The functional groups on branched polyurethane exhibit a pronounced influence on its physico‐chemical properties, which can be modified in different directions to adjust performances such as reactivity, viscosity, compatibility, and solubility 25,26 . Polyurethane molecular chain is soft and flexible, and it is used as an excellent textile printing adhesive.…”

“…23,24 The functional groups on branched polyurethane exhibit a pronounced influence on its physico-chemical properties, which can be modified in different directions to adjust performances such as reactivity, viscosity, compatibility, and solubility. 25,26 Polyurethane molecular chain is soft and flexible, and it is used as an excellent textile printing adhesive. Reactive epoxy groups are introduced into the branched polyurethane to carry out ring-opening reactions, which endow the dispersant the ability to crosslink.…”