Abstract
The cooperative diffusion coefficient D coop and the normalized variance μ 2 \\ ̄ qG −2 for bimodal end-linked polydimethylsiloxane (PDMS) networks were determined by means of dynamic light scattering (DLS) measurements. D coop was proportional to polymer weight concentration at the equilibrium state of swelling C e to the power of 0.88, which was larger than the theoretical exponent, compared with the unimodal PDMS networks. Further, the value of μ 2 \\ ̄ qG −2 at the lowest C e was greater than that of the corresponding bimodal PDMS solutions in the semidilute regime, and the autocorrelation function of DLS could be reproduced by a double-exponential fitting. These facts suggested a spatially and compositionally heterogeneous structure of bimodal PDMS networks, especially in the case of the lowest C e.
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