Summary
Extremely short hydroxyl-terminated polydimethylsiloxane (PDMS) chains (having a molecular weight Mn of approximately 220 g mol−1) were endlinked with much longer PDMS chains (Mn−18,500 g mol−1) to form bimodal elastomeric networks. The end-linking was carried out in two stages, the first of which was prereaction of the short chains into domains of very high crosslink density. One interest was to determine whether these domains might act as deformable filler particles with exceptionally good bonding to the elastomeric matrix, thereby giving enhanced reinforcement, unfortunately, stress-strain measurements on these very heterogeneous networks in elongation did not reveal any such effects. The moduli of these networks, however, were found to support the previous conclusion that the unusually good ultimate properties of bimodal networks in general are due to an intramolecular effect, specifically the very limited extensibility of the short network chains.
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Pan, S.J., Mark, J.E. Model networks of end-linked polydimethylsiloxane chains. Polymer Bulletin 7, 553–559 (1982). https://doi.org/10.1007/BF00256086
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DOI: https://doi.org/10.1007/BF00256086