Critical examination of chemically modified hybrid thermosets: Synthesis, characterization and mechanical behavior in the plateau regime of polyaminosiloxane-nitrile-DGEBA
作者： Artemia Loayza , Juan C. Cabanelas , María González , Juan Baselga
DOI: 10.1016/J.POLYMER.2015.05.054
关键词: Nitrile 、 Dynamic mechanical analysis 、 Propionitrile 、 Materials science 、 Isosbestic point 、 Acrylonitrile 、 Polymer chemistry 、 Hydrogen bond 、 Elastic modulus 、 Thermosetting polymer
摘要: Abstract Poly(3-aminopropylmethylsiloxane) has been modified with acrylonitrile via aza Michael addition and a broad range of oligomers have prepared CN:NH 2 ratio ranging between 0.1 1. NMR FTnIR analysis reveals that modification proceeds without formation tertiary amines. Modified characterized by DSC Tg the adducts are self-associated probably due to weak hydrogen bonding dipole interactions. The degree higher than 0.4 were miscible DGEBA. low high temperature relaxations cured thermosets measured DMTA. In commonly observed β relaxation, new 1 process linked an isosbestic point found. is attributed extended segment comprising pendant propionitrile group as well aminopropyl connects amines polysiloxane backbone. Elastic modulus α relaxation can be tuned from rubbery damping changing nitrile content. experimental network structure obtained elastic measurements related through established structure-property relations.
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