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- W2483060897 abstract "Essentially immiscible mixtures of a polyol-based polyurethane (PU) and poly(n-butyl methacrylate) (PBMA) having both, one, or neither component crosslinked were prepared by photopolymerization of the PBMA precursors in the presence of slowly reacting PU precursors. Within the 30-70% PU range, a morphology of PBMA particles in a continuous PU matrix was found. Particle size decreased as the delay time between the PU and the PBMA initiation increased. Crosslinking the PBMA resulted in irregularly-shaped particles, while spherical particles formed in the absence of crosslinker. Initial moduli and dynamic mechanical properties varied continuously with increasing delay time, with a minimum midway during the PU formation. The effect is more pronounced in the series with irregular particles. Loss tangent peak separation decreased in all of the mixture types as particle size decreased, with a greater effect when both components were crosslinked. Creep and extraction experiments in the PU(x)/PBMA(1) system indicate, respectively, that apparent crosslink density decreases, and grafting, while extensive, decreases with increased delay time. Precursor diluent effects are suggested as the origin of many of the property and structure changes resulting from altering the sequence of component formation." @default.
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- W2483060897 date "1989-07-21" @default.
- W2483060897 modified "2023-10-16" @default.
- W2483060897 title "Synthetic Sequence Effects on Cross-Linked Polymer Mixtures" @default.
- W2483060897 doi "https://doi.org/10.1021/bk-1989-0395.ch010" @default.
- W2483060897 hasPublicationYear "1989" @default.
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