title: Interactions of hydrophobically modified polyvinylamine with pluronic triblock copolymer micelles.
abstract: The heats associated with the addition of triblock copolymers of ethylene oxide and propylene oxide (PEO-PPO-PEO pluronics) to solutions of linear polyvinylamine, with N-substituted pendant octyl groups (HMPVAm), were measured as functions of pH and pluronic structure. The interactions were exothermic with the overall enthalpy decreasing with increasing pH from 5 to 10. Surprisingly, the heat effect increased with increasing pluronic hydrophilicity; however, no enthalpy change was observed in the absence of micelles. The results were quantitatively modeled by assuming two competing processes-micellar dissolution and HMPVAm coating of micelles, preventing dissolution.
authors.affiliation: McMaster Centre for Pulp and Paper Research, Department of Chemical Engineering, JHE-136, McMaster University, Hamilton, Ontario, Canada L8S 4L7.
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiaonong
authors.initials: X
authors.lastname: Chen
authors.forename: Robert
authors.initials: R
authors.lastname: Pelton