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Soft, solvent‐free poly(dimethylsiloxane) elastomers are fabricated by a one‐step process via crosslinking bottlebrush polymers. The bottlebrush architecture prevents the formation of entanglements, resulting in elastomers with precisely controllable low moduli from 1 to 100 kPa, below the lower limit of traditional elastomers; moreover, the solvent‐free nature enables their negligible adhesiveness...
Conventional elastomers formed by crosslinking entangled polymers cannot be softer than an intrinsic threshold value set by the entanglements. As illustrated on the front cover and described on page 5132, M. Rubinstein, D. A. Weitz and co‐workers develop a strategy to eliminate entanglements by using bottlebrush rather than linear polymers. They demonstrate this concept for the most widely used silicon‐based...
Using fluorescence correlation spectroscopy (FCS) we measure the translational diffusion coefficient of Iino coal asphaltenes and UG8 petroleum asphaltenes dispersed in toluene at extremely low concentrations (0.03–3.0mg/L). Using a simple scaling argument we compare them with several molecules of known size and molecular weight. We find that Iino coal asphaltene molecules – which have a comparatively...
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