A cosolvency effect on tunable thermosensitive core-shell nanoparticle gels

Title
A cosolvency effect on tunable thermosensitive core-shell nanoparticle gels
Authors
배영찬
Keywords
BINARY POLYMER-SOLUTIONS; DOUBLE-LATTICE MODEL; ANGLE X-RAY; SWELLING BEHAVIORS; STATISTICAL-MECHANICS; PHASE-TRANSITION; MIXED-SOLVENTS; DRUG-DELIVERY; MICROGELS; HYDROGELS
Issue Date
2015-04
Publisher
ROYAL SOC CHEMISTRY
Citation
SOFT MATTER, v. 11, NO 19, Page. 3936-3945
Abstract
The influence of co-solvents on the swelling behavior of tunable thermosensitive core-shell nanoparticle gels was investigated. The poly(methyl methacrylate) (PMMA) core and poly(2-hydroxyethyl methacrylate) (PHEMA) shell network in 1-propanol reacted differently upon the addition of three co-solvents (cyclohexane (CHX), 1,3-propanediol (PDO), and water), resulting in highly controllable swelling properties of the core-shell gels. In particular, a strongly enhanced solvation effect, called the cosolvency phenomenon, occurred even with a very small amount of water (1-3 wt%). To examine the tunability, thermo-optical analysis (TOA) and photon correlation spectroscopy (PCS) were employed. The results show that a small addition of CHX, PDO, or water induced the "lower/upper,'' "even/upper,'' and "lower/lower'' volume transition temperatures (VTTs) of the core-shell networks, respectively. For theoretical treatment, a multi-component lattice theory of mixing was combined with the Flory-Rehner (F-R) chain model to calculate the net free energy of mixing. The required interaction parameters were obtained from the binary and ternary phase diagrams of the linear polymer solutions and were applied directly to the swelling calculation of the cross-linked core-shell network solutions. The calculated results corresponded well with the experimental swelling data without further adjustment.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2015/SM/C5SM00448A#!divAbstracthttp://hdl.handle.net/20.500.11754/23970
ISSN
1744-683X; 1744-6848
DOI
http://dx.doi.org/10.1039/c5sm00448a
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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