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Issue 68, 2018, Issue in Progress
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Thermally-healable network solids of sulfur-crosslinked poly(4-allyloxystyrene)

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Abstract

Network polymers of sulfur and poly(4-allyloxystyrene), PAOSx (x = percent by mass sulfur, where x is varied from 10–99), were prepared by reaction between poly(4-allyloxystyrene) with thermal homolytic ring-opened S8 in a thiol-ene-type reaction. The extent to which sulfur content and crosslinking influence thermal/mechanical properties was assessed. Network materials having sulfur content below 50% were found to be thermosets, whereas those having >90% sulfur content are thermally healable and remeltable. DSC analysis revealed that low sulfur-content materials exhibited neither a Tg nor a Tm from −50 to 140 °C, whereas higher sulfur content materials featured Tg or Tm values that scale with the amount of sulfur. DSC data also revealed that sulfur-rich domains of PAOS90 are comprised of sulfur-crosslinked organic polymers and amorphous sulfur, whereas, sulfur-rich domains in PAOS99 are comprised largely of α-sulfur (orthorhombic sulfur). These conclusions are further corroborated by CS2-extraction and analysis of extractable/non-extractable fractions. Calculations based on TGA, FT-IR, H2S trapping experiments, CS2-extractable mass, and elemental combustion microanalysis data were used to assess the relative percentages of free and crosslinked sulfur and average number of S atoms per crosslink. Dynamic mechanical analyses indicate high storage moduli for PAOS90 and PAOS99 (on the order of 3 and 6 GPa at −37 °C, respectively), with a mechanical Tg between −17 °C and 5 °C. A PAOS99 sample retains its full initial mechanical strength after at least 12 pulverization-thermal healing cycles, making it a candidate for facile repair and recyclability.

Graphical abstract: Thermally-healable network solids of sulfur-crosslinked poly(4-allyloxystyrene)

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Article information


Submitted
16 Aug 2018
Accepted
12 Nov 2018
First published
20 Nov 2018

This article is Open Access

RSC Adv., 2018,8, 39074-39082
Article type
Paper

Thermally-healable network solids of sulfur-crosslinked poly(4-allyloxystyrene)

T. Thiounn, M. K. Lauer, M. S. Bedford, R. C. Smith and A. G. Tennyson, RSC Adv., 2018, 8, 39074
DOI: 10.1039/C8RA06847J

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