Theoretical and Experimental Study of Thymine Based Photoresists Polymers

VICH BERLANGA, J.; CASIS, N.; LUCIANI, C. V.; MARTINO, D.; ESTENOZ, D. A.; MEIRA, G. R.

Viña del Mar

Congreso; IV Simposio Chileno-Argentino de Polímeros – ARCHIPOL 2007; 2007

Styrene-based biopolymers containing ionic and thymine groups chemically attached to the polystyrene structure were experimental- and heoretically investigated. Vinylbenzyl thymine (VBT) was copolymerized in a batch solution process with vinylbenzyl triethylammonium chloride (VBA) or vinylphenylsulfonic acid sodium salt (SSA), using different comonomers ratios and initiator concentrations. Samples were taken along the reactions to determine: (i) monomer conversion by gravimetry, (ii) chemical composition by elemental analysis, and (iii) molecular weight distribution by chromatography (SEC). A mathematical model that simulates the polymers synthesis was developed. The model enables the calculation of the evolution of the reagent and product concentrations and the molecular weight distribution of the copolymer. Theoretical predictions are in good agreement with measurements.Samples were taken along the reactions to determine: (i) monomer conversion by gravimetry, (ii) chemical composition by elemental analysis, and (iii) molecular weight distribution by chromatography (SEC). A mathematical model that simulates the polymers synthesis was developed. The model enables the calculation of the evolution of the reagent and product concentrations and the molecular weight distribution of the copolymer. Theoretical predictions are in good agreement with measurements.