styrene (St, 99%), butyl acrylate (BA, 99%), potassium peroxodisulfate
(KPS, 95%), sodium dodecyl sulfate (SDS, 95%), disodium hydrogenphosphate
(99%), eosin Y (EoY, 95%), phloxine B (PhB, 98%), erythrosine (Ery,
95%), rose bengal (RB, 95%), orange II (OrII, 98%), tartrazine (Ttz,
98%), and ethanol (EtOH, 99.5%) were purchased from Wako Pure Chemical
Industries and used as received. 2-(2-Ethoxyethoxy) ethyl acrylate
(ET2A, 98%), 4-methoxystyrene (MSt, 98%), N-isopropylacrylamide
(NIPAm, 98%), and N,N′-methylenebis(acrylamide)
(BIS, 97%) were purchased from Tokyo Chemical Industry and used as
received. 2-(2-Methoxyetoxy) ethyl acrylate (ME2A, 95%) was purchased
from Monomer-Polymer and Dajac Labs, Inc. 2-[2-(2-Methoxyethoxy)ethoxy]ethyl
acrylate (Me3A, 98%) was kindly donated by Kyoeisha Chemical Co.,
Ltd. The cross-linker, ethylene glycol dimethacrylate (EGDMA, 98%),
was purchased from Sigma-Aldrich and used as received. Water used
for microsphere preparations was distilled and then ion-exchanged
(EYELA, SA-2100E1).