TY - JOUR
T1 - Thermally expandable microspheres with high expansion ratios
T2 - Design of core and shell for largest size change
AU - Gomez, Jasmine C.
AU - Vishnosky, Nicholas S.
AU - Grafstein, Jeremy T.
AU - Kim, Spencer T.
AU - Steinhardt, Rachel C.
N1 - Publisher Copyright:
© 2022 Wiley Periodicals LLC.
PY - 2022/7/20
Y1 - 2022/7/20
N2 - Thermally expandable microspheres (TEMs) are liquid-core, polymer-shelled particles that are useful in both current industry and future manufacturing and basic research applications. Here, we systematically optimize TEMs for highest expansion ratio using a broad-spectrum infrared head source. Microspheres are synthesized from a copolymer of 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate, and acrylonitrile as the shell, which is optimized for greatest expansion ratio. This represents the first time that HEMA is used in TEMs. The liquid blowing agent core is next optimized, followed by the prepolymerization emulsion time. It is found that particle morphology is greatly variable and influenced by kinetic and thermodynamic factors, with various phase-separated and aniosotropic morphologies accessed.
AB - Thermally expandable microspheres (TEMs) are liquid-core, polymer-shelled particles that are useful in both current industry and future manufacturing and basic research applications. Here, we systematically optimize TEMs for highest expansion ratio using a broad-spectrum infrared head source. Microspheres are synthesized from a copolymer of 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate, and acrylonitrile as the shell, which is optimized for greatest expansion ratio. This represents the first time that HEMA is used in TEMs. The liquid blowing agent core is next optimized, followed by the prepolymerization emulsion time. It is found that particle morphology is greatly variable and influenced by kinetic and thermodynamic factors, with various phase-separated and aniosotropic morphologies accessed.
KW - core-shell
KW - particle morphology
KW - soft matte
KW - thermally-expanding microspheres
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U2 - 10.1002/app.52517
DO - 10.1002/app.52517
M3 - Article
AN - SCOPUS:85129525142
SN - 0021-8995
VL - 139
JO - Journal of Applied Polymer Science
JF - Journal of Applied Polymer Science
IS - 28
M1 - e52517
ER -