PMID- 15248735
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20060607
LR  - 20040713
IS  - 0743-7463 (Print)
IS  - 0743-7463 (Linking)
VI  - 20
IP  - 15
DP  - 2004 Jul 20
TI  - Particle morphology as a control of permeation in polymer films obtained from 
      MMA/nBA colloidal dispersions.
PG  - 6443-9
AB  - 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 colloidal films at elevated temperatures causes migration of SDOSS to 
      the F-A interface, but for films containing primarily p-nBA, reverse diffusion 
      back into the bulk is observed. These studies illustrate that the combination of 
      different particle morphologies and temperatures leads to controllable permeation 
      processes through polymeric films.
CI  - Copyright 2004 American Chemical Society
FAU - Lestage, David J
AU  - Lestage DJ
AD  - School of Polymers and High Performance Materials, Shelby F. Thames Polymer 
      Science Research Center, University of Southern Mississippi, Hattiesburg, 
      Mississippi 39406, USA.
FAU - Urban, Marek W
AU  - Urban MW
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
EDAT- 2004/07/14 05:00
MHDA- 2004/07/14 05:01
CRDT- 2004/07/14 05:00
PHST- 2004/07/14 05:00 [pubmed]
PHST- 2004/07/14 05:01 [medline]
PHST- 2004/07/14 05:00 [entrez]
AID - 10.1021/la049823i [doi]
PST - ppublish
SO  - Langmuir. 2004 Jul 20;20(15):6443-9. doi: 10.1021/la049823i.