Particle morphology as a control of permeation in polymer films obtained from MMA/nBA colloidal dispersions

Langmuir : the ACS Journal of Surfaces and Colloids
David J Lestage, M W Urban

Abstract

The combination of precision-controlled weight loss measurements and spectroscopic surface FT-IR analysis allowed us to identify unique behaviors of poly(methyl methacrylate) (p-MMA). When MMA and n-butyl acrylate (nBA) are polymerized into p-MMA and p-nBA homopolymer blends, MMA/nBA random copolymers, and p-MMA/p-nBA core-shell morphologies, a controlled mobility and stratification of low molecular weight components occurs in films formed from coalesced colloidal dispersions. Due to different affinities toward water, p-MMA and p-nBA are capable of releasing water at different rates, depending upon particle morphological features of initial dispersions. As coalescence progresses, water molecules are released from the high free volume p-nBA particles, whereas p-MMA retains water molecules for the longest time due to its hydrophilic nature. As a result, water losses at extended coalescence times are relatively small for p-MMA. MMA/nBA copolymer and p-MMA/p-nBA blends follow the same trends, although the magnitudes of changes are not as pronounced. The p-MMA/p-nBA core-shell behavior resembles that of p-nBA homopolymer, which is attributed to significantly lower content of the p-MMA component in particles. Annealing of coalesced c...Continue Reading

References

Dec 1, 2000·Journal of Colloid and Interface Science· van Tent A, te Nijenhuis K

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Citations

Jan 18, 2010·Macromolecular Rapid Communications·Anuradha Misra, Marek W Urban
Mar 9, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·David J Lestage, Marek W Urban
May 10, 2005·Biomacromolecules·Peng He, Marek W Urban

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