TY - JOUR
T1 - Low-ceiling-temperature polymer microcapsules with hydrophobic payloads via rapid emulsion-solvent evaporation
AU - Tang, Shijia
AU - Yourdkhani, Mostafa
AU - Possanza Casey, Catherine M.
AU - Sottos, Nancy R.
AU - White, Scott R.
AU - Moore, Jeffrey S.
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/6/14
Y1 - 2017/6/14
N2 - We report a microencapsulation procedure based on rapid solvent evaporation to prepare microcapsules with hydrophobic core materials and low-ceiling-temperature polymer shell wall of cyclic poly(phthalaldehyde) (cPPA). We use and compare microfluidic and bulk emulsions. In both methods, rapid solvent evaporation following emulsification resulted in kinetically trapped core-shell microcapsules, whereas slow evaporation resulted in acorn morphology. Through the systematic variation of encapsulation parameters, we found that polymer-to-core weight ratios higher than 1 and polymer concentrations higher than 4.5 wt % in the oil phase were required to obtain a core-shell structure. This microencapsulation procedure enabled the fabrication of microcapsules with high core loading, controlled size, morphology, and stability. This procedure is versatile, allowing for the encapsulation of other hydrophobic core materials, i.e., mineral oil and organotin catalyst, or using an alternative low-ceiling-temperature polymer shell wall, poly(vinyl tert-butyl carbonate sulfone).
AB - We report a microencapsulation procedure based on rapid solvent evaporation to prepare microcapsules with hydrophobic core materials and low-ceiling-temperature polymer shell wall of cyclic poly(phthalaldehyde) (cPPA). We use and compare microfluidic and bulk emulsions. In both methods, rapid solvent evaporation following emulsification resulted in kinetically trapped core-shell microcapsules, whereas slow evaporation resulted in acorn morphology. Through the systematic variation of encapsulation parameters, we found that polymer-to-core weight ratios higher than 1 and polymer concentrations higher than 4.5 wt % in the oil phase were required to obtain a core-shell structure. This microencapsulation procedure enabled the fabrication of microcapsules with high core loading, controlled size, morphology, and stability. This procedure is versatile, allowing for the encapsulation of other hydrophobic core materials, i.e., mineral oil and organotin catalyst, or using an alternative low-ceiling-temperature polymer shell wall, poly(vinyl tert-butyl carbonate sulfone).
KW - bulk emulsification
KW - hydrophobic payloads
KW - low-ceiling-temperature polymers
KW - microfluidic emulsification
KW - solvent evaporation
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U2 - 10.1021/acsami.7b05266
DO - 10.1021/acsami.7b05266
M3 - Article
C2 - 28544851
AN - SCOPUS:85020819037
SN - 1944-8244
VL - 9
SP - 20115
EP - 20123
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 23
ER -