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- W2108422562 abstract "Bimodal elastomeric networks are unusually tough materials in that they generally show large increases in modulus at high elongations. In the present study such networks were prepared by end-linking mixtures of very short and relatively long chains of poly(dimethylsiloxane) (PDMS) [Si(CH3)2O]n, which is known to have easily deformable SiOSi bonds. Their stress-strain isotherms were then determined in order to locate the range of elongations over which the upturns were most pronounced. Raman and infrared spectra were then obtained in this range using both a double monochromator Raman spectrophotometer and a Fourier transform infrared spectrophotometer with attenuated total reflection. The elongations imposed were found to cause small but not negligible frequency shifts for the stretching and bending modes of the SiOSi backbone. These shifts are probably due to rotational isomerization of the PDMS skeletal bonds, but there could also be a small contribution from bond-angle deformations. The results thus support the usual assumption that the increases in modulus observed for bimodal networks are primarily due to the very limited number of spatial configurations available to the short network chains, particularly in the case of chains having skeletal bonds that are less easily deformed than those in PDMS." @default.
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- W2108422562 date "1991-03-01" @default.
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- W2108422562 doi "https://doi.org/10.1002/macp.1991.021920303" @default.
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