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- W1481105846 abstract "Two series of semi-interpenetrating polymer networks (semi-IPNs) of the same linear polyurethane (LPU) and two different heterocyclic polymer networks (HPN-1 and HPN-2) based on thermally cured dicyanic ether of Bisphenol-A, were characterized by differential scanning calorimetry (DSC), complex dynamic modulus E* = E' + iE and mechanical loss tangent (tan $delta$ = E/E', where E' and E are the storage and loss components of the loss modulus, respectively). The temerature dependence of $alpha_a$ and $gamma$ relaxations were studied as a function of HPNs content. By the experimental results no large-scale structural heterogeneities were detected in sample with HPN-1. It has been observed that the inclusion of LPU softens both the HPN-1 and HPN-2 rigid networks which, on the contrary, affects the LPU chain motion by restricting the cooperative long-range segmental dynamics. Single glass transitions are observed in semi-IPN-1 which indicate an affinity between LPU and HPN-1 and also a large scale structural homogeneity.Differently from semi-IPN-1, two glass transitions are observed in semi-IPN-2, where the absence of chemical intermolecular interactions is thought to give rise to a double phase amorphous network, each phase preserving the main morphological characteristics of the pure components.Keywords: Anelasticity; Internal friction; AnharmonicityPacs index: 61.40 km or 62.40+i" @default.
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- W1481105846 date "2001-01-01" @default.
- W1481105846 modified "2023-09-24" @default.
- W1481105846 title "Dynamics of segmental relaxations for cyanurate-containing semi-interpenetrating polymer networks" @default.
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