Abstract
To design diblock copolymers with optimum performance as stabilizers for colloidal dispersions, it is important to understand the relationships between surface coverage, layer thickness and block sizes. This work is an experimental study to gain this understanding using low polydispersity diblock copolymer of dimethyl amino ethyl methacrylate (DMAEM) and n-butyl methacrylate, adsorbed on narrow size distribution silica particles in 2-propanol. Both blocks are soluble in 2-propanol, whereas only DMAEM block adsorbs on silica in 2-propanol. With copolymers of constant degrees of polymerization of ca. 200 and ca. 700, our experimental results show that very steep maximums both in adsorbed amount and in hydrodynamic layer thickness exist. The existence of these maximums was first predicted by the self-consistent field theory using a lattice model. For the adsorption regime dominated by packing of the non-adsorbing block, the hydrodynamic layer thickness was found to scale on the order of 0.53, which is less that that of previous work.
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Wu, D., Yokoyama, A. & Setterquist, R. An Experimental Study on the Effect of Adsorbing and Non-Adsorbing Block Sizes on Diblock Copolymer Adsorption. Polym J 23, 709–714 (1991). https://doi.org/10.1295/polymj.23.709
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DOI: https://doi.org/10.1295/polymj.23.709
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