Two antagonistic effects of flow/mixing on reactive polymer blending

Abstract

Reactive polymer blending is basically a flow/mixing-driven process of interfacial generation, interfacial reaction for copolymer formation, and morphology development. This work shows two antagonistic effects of flow/mixing on this process: while flow/mixing promotes copolymer formation by creating interfaces and enhancing collisions between reactive groups at the interfaces, excessive flow/mixing may pull the in situ formed copolymer out of the interfaces to one of the two polymer components of the blend, especially when the copolymer becomes highly asymmetrical.As such, the copolymer may lose its compatibilization efficiency. The mixing-driven copolymer pull-out from the interfaces is a catastrophic process (less than a minute), despite the high viscosity of the polymer blend. It depends on the molecular architecture of the reactive compatibilizer, polymer blend composition, flow/mixing intensity, and annealing. These findings are obtained using the concept of reactive compatibilizer-tracer and a model reactive polymer blend.

A rheological method to characterize the molecular weight changes of polyamide 1012 during solid state polymerization

“…GPC measurements were carried out using CHCl 3 as an eluent. The tests were performed within 6 hours after the sample solution preparation to avoid possible gelation 33–35 …”

“…The tests were performed within 6 hours after the sample solution preparation to avoid possible gelation. [33][34][35]…”

Functional rubber composites based on silica-silane reinforcement for green tire application: the state of the art

“…In order to improve the compatibility between the hydrophobic NR matrix and the hydrophilic silica filler, TESPT acts as a reactive compatibilizer and coupling agent. A reactive compatibilizer forms a compatibilizer that promotes interfacial adhesion [43,44] whereas a coupling agent chemically links the filler and polymer matrix. The use of silane coupling agents as reinforcement agents still has several significant drawbacks, such as the production of alcohol as a byproduct of the coupling reaction, the high cost of silane coupling agents, and complex processing behaviour [45].…”

Reactive Janus Particle Compatibilizer with Adjustable Structure and Optimal Interface Location for Compatibilization of Highly Immiscible Polymer Blends

“…Reactive compatibilizers include mainly reactive copolymers ,− and reactive nanoparticles. − The goal of these compatibilization strategies is to locate the compatibilizers stably at the interface, which reduces the interface tension and enhances the interface adhesion, ultimately achieving homogeneous dispersion. For reactive compatibilizers, the different interaction forces between matrix and compatibilizer lead to the orientation and movement of the compatibilizer during the blending process, , which influence the final distribution and location of the compatibilizer. Moreover, the viscosity of the polymer matrix, , processing procedure, , and compatibilizer structure all play key roles in controlling the compatibilizer movement and dispersity.…”