Trimerization Reaction Kinetics and Tg Depression of Polycyanurate under Nanoconfinement
| Autor: | Sindee L. Simon, Evelyn Lopez |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Macromolecules. 48:4692-4701 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Trimerization of a mixture containing a mono- and difunctional cyanate ester is investigated under the nanoporous confinement of silanized hydrophobic controlled pore glass using differential scanning calorimetry. The trimerization reaction of the nanoconfined monomer mixture is accelerated relative to the bulk by as much as 12 times in 8 nm pores, but this acceleration is less than half that observed for nanoconfinement of the individual monomers. The absolute reaction rate of the monomer mixture lies between those of the individual species, being slower than the monocyanate ester and faster than the dicyanate ester. The results are consistent with the hypothesis that the reaction acceleration is due to monomer ordering or layering at the pore surface, leading to a local concentration of reactive groups higher than in the bulk. In addition to the influence of nanoconfinement on trimerization kinetics, the molecular weight and glass transition temperature (Tg) of the polycyanurate formed in the nanopores ... |
| Databáze: | OpenAIRE |
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