IIIA-4 dynamics of polymer dissolution

Ouano, A. C.; Tu, Yih-O; Carothers, J. A.

doi:10.1109/t-ed.1976.18609

Cited by 1 publication

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“…This description that works so well for polystyrene fails when applied to poly(methyl methacrylate). Ouano and Carothers have shown that poly(methyl methacrylate) dissolves without formation of a significant gel layer except for the case of very high molecular weight samples. − …”

Section: Introductionmentioning

confidence: 99%

“…Ouano and Carothers have shown that poly-(methyl methacrylate) dissolves without formation of a significant gel layer except for the case of very high molecular weight samples. [3][4][5][6] It is tempting to apply the scaling approach to the description of the dissolution of phenolic polymers in aqueous base, but this is inappropriate for two reasons. First, the material of greatest engineering interest, novolac, has a degree of polymerization of about 10 and a M w of the order of 1000, far below the entanglement molecular weight.…”

Section: Introductionmentioning

confidence: 99%

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The Mechanism of Phenolic Polymer Dissolution: A New Perspective

et al. 1997

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The function of common, positive tone photoresist materials is based on radiation-induced modulation of the dissolution rate of phenolic polymer films in aqueous base. The process through which novolac and other low molecular weight phenolic polymers undergo dissolution is examined from a new perspective in which the “average degree of ionization” of the polymer is regarded as the principal factor that determines the rate of dissolution rather than a diffusive, transport process. This perspective has been coupled with a probabilistic model that provides an explanation for the dependence of the dissolution rate on molecular weight, base concentration, added salts, residual casting solvent, and the addition of “dissolution inhibitors”. It predicts the observed minimum base concentration below which dissolution is no longer observed, and it predicts a molecular weight dependence of that phenomenon. A series of experiments was designed to test this predicted molecular weight response. The results of these experiments are in good agreement with the predicted response.

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Section: Introductionmentioning

confidence: 99%