Poly(ε-caprolactone-b-perfluoropolyether-b-ε-caprolactone) (PCL-PFPE-PCL) triblock copolymers having hydroxy end groups were readily functionalised with triethoxysilane end groups by reactions with 3-isocyanatopropyltriethoxysilane. Organic-inorganic hybrids were prepared by using the sol-gel process in the presence of tetraethoxysilane and hydroxy or triethoxysilane terminated PCL-PFPE-PCL. Fully transparent hybrid materials with high content of organic matter were obtained only in the case of alkoxysilane functionalised copolymers. For such systems the PCL-PFPE-PCL copolymer was so intimately mixed with the inorganic network to prevent crystallisation of the PCL segments. The progress of the sol-gel reaction was limited by the early vetrification of the reactive system, while the interpenetration of the organic phase was enhanced by curing the samples at 100 °C. © 2002 Elsevier Science Ltd. All rights reserved.
Messori M., Toselli M., Pilati F., Mascia L., Tonelli C. (2002). Synthesis and characterisation of silica hybrids based on poly(ε-caprolactone-b-perfluoropolyether-b-ε-caprolactone). EUROPEAN POLYMER JOURNAL, 38(6), 1129-1136 [10.1016/S0014-3057(01)00295-6].
Synthesis and characterisation of silica hybrids based on poly(ε-caprolactone-b-perfluoropolyether-b-ε-caprolactone)
Toselli M.;
2002
Abstract
Poly(ε-caprolactone-b-perfluoropolyether-b-ε-caprolactone) (PCL-PFPE-PCL) triblock copolymers having hydroxy end groups were readily functionalised with triethoxysilane end groups by reactions with 3-isocyanatopropyltriethoxysilane. Organic-inorganic hybrids were prepared by using the sol-gel process in the presence of tetraethoxysilane and hydroxy or triethoxysilane terminated PCL-PFPE-PCL. Fully transparent hybrid materials with high content of organic matter were obtained only in the case of alkoxysilane functionalised copolymers. For such systems the PCL-PFPE-PCL copolymer was so intimately mixed with the inorganic network to prevent crystallisation of the PCL segments. The progress of the sol-gel reaction was limited by the early vetrification of the reactive system, while the interpenetration of the organic phase was enhanced by curing the samples at 100 °C. © 2002 Elsevier Science Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
