Synthesis, characterization and properties of self-healable ionomeric carboxylated styrene–butadiene polymer
Source abstract
Abstract
The paper describes synthesis and properties of carboxylated styrene–butadiene rubber (XSBR) and its ionomer using the reaction between carboxyl groups of XSBR and zinc stearate. The self-aggregation of Zn2+ ion pairs resulted in the formation of an ionic cross-linked network, which gave excellent properties to XSBR. The transitions due to the self-association of the ionic cross-links in the ionomers in addition to the glass transition were observed in the dynamic mechanical analysis. The cross-linked XSBR with 1 and 3 wt% of zinc stearate showed a tensile strength value of 4.2 and 5.2 MPa, which were much higher than that (2.5 MPa) of pristine XSBR. Self-healing test was done for the ionomer, where a tensile strength value of 5.2 MPa (before healing) and a value of 3.5 MPa (after healing) were observed, which indicated that the ionic cross-links could heal the interphase. The ionic network polymers also displayed excellent self-healing ability, triggered by heating at 100 °C for 3 h via atomic force microscopy. The healing efficiency of the XSBR/Zn stearate compound was calculated as 68%. Thermoreversible behaviour of the polymer via ionic cross-links showed regular reversal of storage modulus (E’) with varying temperature at constant frequency and strain. This study thus opens up a route for developing the self-healable ionic cross-linked XSBR with considerable mechanical properties for various engineering applications.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Polymer composites and self-healing · Polymer Nanocomposites and Properties · Synthetic Organic Chemistry Methods
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