Abstract
A new family of colloidal dispersions containing N-(dl)-(1-hydroxymethyl) propylmethacrylamide (dl-HMPMA) and n-butyl acrylate (nBA) monomers was developed which exhibits temperature-responsive behavior. Particle size analysis, along with UV−vis and 1H NMR spectroscopic measurements, showed that aqueous p(dl-HMPMA/nBA) particle dispersions display second-order lower critical solution temperature (II-LCST) in the 27−37 °C range at which the particle size decreases from 81 to 47 nm. When p(dl-HMPMA/nBA) colloidal particles were coalesced to form films, which is facilitated by the lower Tg nBA component that maintains an adequate free volume for temperature-responsive dl-HMPMA segments, coalesced films exhibited 3D directional responsiveness to temperature. While shrinkage occurs in the x−y plane directions (length and width, respectively), expansion in the z direction (thickness) above II-LCST is observed. Computer thermodynamics molecular simulations combined with the experimental data showed that conforma...
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