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Influence of Dendrimer Additives on the Dewetting of Thin Polystyrene Films



M E. Mackay, Y Hong, M Jeong, S Hong, T P. Russell, C J. Hawker, R Vestberg, Jack F. Douglas


A small mass concentration of poly(benzyl ether) dendrimer added to a low molecular mass polystyrene is found to inhibit the dewetting of a thin ( 50 nm) polystyrene film from an acid etched silicon substrate. The inhibition effect is found to depend on generation number where the lowest generation (G = 3) tested was the most effective. Our findings are qualitatively similar to a previous phenomenon observed by Barnes et al. [Macrom. 2000, 33, 4177-4185] where the addition of fullerenes ('buckey balls,' ) similarly inhibited the dewetting of thin polystyrene and polybutadiene films. Thus, dewetting inhibition by nanoparticles appears to be a general effect, although certain conditions apparently need be met for its occurrence. Specifically, a general tendency for the particles to segregate to the solid substrate seems to be required and the interaction between the particles and polymer must not be too unfavorable. The phase boundaries of the dendrimer-polymer mixtures depends on the generation, the higher generation being more miscible in terms of mass fraction. This suggests the driving force for the dendrimer to segregate to the boundary is varied by changing the generation number, thus giving rise to a dendrimer generational effect on dewetting suppression.
No. 5


dendrimers, dewetting suppression, fullerenes, generation number, island structures, phase separation, polymer films


Mackay, M. , Hong, Y. , Jeong, M. , Hong, S. , Russell, T. , Hawker, C. , Vestberg, R. and Douglas, J. (2002), Influence of Dendrimer Additives on the Dewetting of Thin Polystyrene Films, Langmuir, [online], (Accessed June 20, 2024)


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Created February 28, 2002, Updated October 12, 2021