• Boutevin, Bernard
• Vázquez, Cuauhtémoc Pozos
• Jolyduhamel, Christine

Abstract

<jats:title>Abstract</jats:title><jats:p>This article describes the synthesis and characterization of a series of poly(propylene glycol bismaleimide) (PPGM) with molecular weights (<jats:styled-content>$ M _{{ ws}}$<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-ueqn-1.gif" xlink:title="equation image" /></jats:styled-content>) in the range of 390–2 600 g · mol<jats:sup>−1</jats:sup>. Their photopolymerization rates without photoiniator were similar to that of an acrylate resin in the presence of a photoinitiator. The reactivities and degrees of conversion of these PPGM oligomers, thermal and mechanical properties of the resulting materials were studied as a function of <jats:styled-content>$ M _{ w}$<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-ueqn-2.gif" xlink:title="equation image" /></jats:styled-content>. Rigid materials were obtained except for that containing the longest PPGM, which exhibited mechanical properties of a rubber. The glass transition temperature values and the thermal stability were found to decrease when <jats:styled-content>$ M _{ w}$<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-ueqn-3.gif" xlink:title="equation image" /></jats:styled-content> of used oligomers was increased. Crosslinking density was the parameter that controlled both mechanical and thermal properties.</jats:p><jats:p><jats:boxed-text content-type="graphic" position="anchor"><jats:graphic xmlns:xlink="http://www.w3.org/1999/xlink" mimetype="image/gif" position="anchor" specific-use="enlarged-web-image" xlink:href="graphic/mgra001.gif"><jats:alt-text>magnified image</jats:alt-text></jats:graphic></jats:boxed-text> </jats:p>

Topics

• density
• glass
• glass
• glass transition temperature
• molecular weight
• resin
• rubber