Thermally depolymerizable polycarbonates

Another example is thermally depolymerizable polycarbonates that are sensitized with onium salt cationic photoinitiators (139). As discussed previously (Section 3.2.3), one of the positive-negative resists based on polystyrene with pendant tertiary butyl carbonate protecting groups undergoes acid-catalyzed thermolysis to generate poly( p-vinylphenol), carbon dioxide, and isobutene. Therefore, if the tertiary butyl carbonate moiety is incorporated in the polymer backbone as a repeating unit, such polymers will... 

The hydrolysis of esters or carbonates of tertiary alcohols have also been employed to degrade resist polymer backbone, with a view to making them soluble in the developer. In particular, Frechet et al. prepared resists based on thermally depolymerizable polycarbonates, such as the structure shown in Scheme 7.46, which exhibit great thermal lability and undergo multiple... 

Frechet, F.M. Houlihan, F. Bouchard, B. Kryczka, and C.G. Willson, Design, synthesis and study of novel thermally depolymerizable polycarbonates, J. Chem. Soc. Commun., p. 1514 (1985) F.M. Houhhan, F. Bouchard, J.M.J. Frechet, and C.G. Willson, Thermally depolynner polycarbo nates. II. Synthesis of novel linear tertiary copolycarbonates by phase transfer catalysis, Macromol ecules, 19, 13 (1986). 

Synthesis of thermally depolymerizable polycarbonates designed to provide imaging via an acid catalyzed multiple chain-scission process. 

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