Issue 23, 2022

Mediating the slow dynamics of polyacrylates by small molecule-bridged hydrogen bonds

Abstract

This report studied the changes in the slow dynamics of polyacrylate by adding a hindered phenol (CA) capable of forming three intermolecular hydrogen bonds (inter-HBs) per molecule with the polymer chain. The CA molecule apparently diminishes the slow modes (with lower peak temperatures and peak heights) of the polyacrylate, although it has a higher glass transition temperature (Tg) than the acrylic matrix, and the rigid CA-bridged HB network significantly amplifies the α-relaxation near Tg (with higher peak temperatures and peak heights). Consequently, the mixtures exhibit a diminishing slow mode that gradually merges with the prominent α-peak with increasing CA loadings. The anomalous dynamics concerning the opposite behaviors of the slow mode and α-relaxation was further rationalized in terms of dissociation of inter-HBs when the temperature is higher than Tg, together with the small molecule-alleviated macromolecular connectivity. This work provides essential insights into the slow dynamics of such HB-driven hybrids, and paves the way for tailoring the viscous flow properties of the hybrid material from a molecular level perspective.

Graphical abstract: Mediating the slow dynamics of polyacrylates by small molecule-bridged hydrogen bonds

Article information

Article type
Paper
Submitted
10 Apr 2022
Accepted
16 May 2022
First published
19 May 2022

Soft Matter, 2022,18, 4445-4454

Mediating the slow dynamics of polyacrylates by small molecule-bridged hydrogen bonds

Y. Liu, G. Shi and G. Wu, Soft Matter, 2022, 18, 4445 DOI: 10.1039/D2SM00453D

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