LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

Preparation of poly(thiourethane) thermosets by controlled thiol-isocyanate click reaction using a latent organocatalyst

Photo by anniespratt from unsplash

Abstracts Different poly(thiourethane) thermosets were prepared by means of a thiol-isocyanate click reaction starting from three diisocyanates with different structure (isophorone diisocyanate, IPDI, 4,4′-methylene bis(cyclohexy isocyanate), HMDI and hexamethylene diisocyanate,… Click to show full abstract

Abstracts Different poly(thiourethane) thermosets were prepared by means of a thiol-isocyanate click reaction starting from three diisocyanates with different structure (isophorone diisocyanate, IPDI, 4,4′-methylene bis(cyclohexy isocyanate), HMDI and hexamethylene diisocyanate, HDI, and a tetrathiol, pentaerythritol tetrakis(3-mercaptopropionate), PETMP. The curing process has been catalyzed by basic and acid catalysts. The use of a thermally activated base generator (1-methylimidazolium tetraphenylborate, BG1MI), which is an organocatalyst, allowed a better control on the curing initiation than those traditionally used dibutyltin dilaurate (DBTDL) or tertiary amines. The curing evolution was investigated by DSC and FTIR spectroscopy. The materials obtained were characterized by thermomechanical and mechanical tests. Homogeneous materials were obtained in all cases. The chemical structure of the network was correlated with the thermal and mechanical data determined. Tg values in the range of 75 to 150 °C were obtained. The thermal degradation of these materials has also been investigated and a complex degradation mechanism, with three different steps was observed in all cases. These materials showed a higher thermal stability than their oxygen counterparts did. The thermosets obtained using the latent organocatalyst have similar characteristics to the ones obtained by using the common DBTDL.

Keywords: click reaction; organocatalyst; isocyanate click; thiourethane thermosets; thiol isocyanate; poly thiourethane

Journal Title: Reactive and Functional Polymers
Year Published: 2019

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.