Accession Number:

ADA244029

Title:

Dissolution Rates of Copolymers Based on 4-Hydroxystyrene and Styrene

Descriptive Note:

Technical rept.,

Corporate Author:

CORNELL UNIV ITHACA NY SCHOOL OF CHEMICAL ENGINEERING

Report Date:

1991-12-18

Pagination or Media Count:

17.0

Abstract:

Copolymers were synthesized by free-radical polymerization using 4- acetoxystyrene and styrene in various ratios. These polymers then were hydrolyzed to the corresponding 4-hydroxystyrene phenol copolymers. The dissolution rates of the copolymers using laser interferometry decreased with a decrease in hydroxyl group content in aqueous developers sodium hydroxide, potassium hydroxide, and a tetramethylammonium hydroxide based commercial developer. While an increase in pH value enhances the dissolution, an increase in cation size of these hydroxides at constant pH decreases the dissolution rate. The polymers become essentially insoluble in aqueous developers when the content of the monomer containing the hydroxyl group is less than 70 mole. The dissolution rate of P4HSS in organic solvents, methyl isobutyl ketone MIBK, isopropyl alcohol IPA, and their mixtures, increases as the styrene content increases. However, in IPA, dissolution rate goes through a maximum and then drops down with styrene content greater than 50 mole. In mixtures of these two solvents, the polymer dissolves faster than it does in either pure solvent.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE