کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1396007 | 984153 | 2011 | 10 صفحه PDF | دانلود رایگان |

Novel nanoporous thermosetting films were obtained from thermostable polycyanurate (PCN)-based hybrid networks synthesized by polycyclotrimerization of cyanate ester of bisphenol E in the presence of a modifier reactive toward cyanate groups, i.e. dihydroxy-telechelic poly(ε-caprolactone) (PCL). The nanoporous structure was generated in PCN/PCL hybrid networks after extraction of unreacted free PCL sub-chains which were not chemically incorporated into the PCN cross-linked framework. Structure–property relationships for precursory and porous PCN/PCL hybrid networks were investigated using a large array of physico-chemical techniques. The porosity associated with the networks after extraction was more particularly evaluated by SEM and DSC-based thermoporometry: pore sizes around 10–90 nm were determined along with pore volumes as high as about 0.3 cm3 g−1. Density and dielectric measurements strongly suggested the occurrence of closed pore structures. Due to their high thermal stability as investigated by TGA, nanoporous PCN/PCL hybrid cross-linked films could be considered as promising materials for potential applications as thermostable membranes.
Figure optionsDownload as PowerPoint slideHighlights
► Nanoporous thermosets are formed by extraction of free PCL from PCN/PCL networks.
► Nanopores around 10–90 nm are generated with pore volumes as high as 0.3 cm3 g−1.
► Density and dielectric measurements suggest the occurrence of closed pores.
► Porous hybrid films possess high Tg values and high thermal stability.
Journal: European Polymer Journal - Volume 47, Issue 9, September 2011, Pages 1736–1745