Journal
LANGMUIR
Volume 25, Issue 6, Pages 3814-3819Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la803866z
Keywords
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Funding
- National Science Foundation [DMR-0805089]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0805089] Funding Source: National Science Foundation
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Oligo(ethylene glycol)-based thermoresponsive core-shell microgels were synthesized by a two-step polymerization method: The core particles mainly consisted of poly(ethylene glycol) ethyl ether methacrylate (PEGEEMA), while the shell mainly consisted of a copolymer of PEGEEMA, poly(ethylene glycol) methyl ether methacrylate (PEGMEMA), and poly(acrylic acid). The copolymerization of the shell resulted in a higher volume phase transition temperature than that of the core. The mass of a single microgel particle was determined by both the static light scattering method and a new method using UV-visible spectroscopy. Core-shell microgels in water self-assembled into crystalline structures with iridescent colors, which were the result of Bragg diffraction. The melting kinetics of microgel crystals was studied by using UV-visible transmission spectroscopy.
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