Formation mechanism of thermally expandable microspheres of PMMA encapsulating NaHCO₃ and ethanol via thermally induced phase separation

Abstract

The formation mechanism of TEMs via TIPS was investigated. It was supported by calculation, the effect of quench rate and stirring speed.

Thermally expandable microspheres with high expansion ratios: Design of core and shell for largest size change

“…[9][10][11][12][13][14] To actualize TEMs' potential to contribute to nextgeneration materials and manufacturing, both new TEM compositions and fundamental design parameters must be determined. 4,[15][16][17] To this end, our interest in soft actuation methods led us to initiate a set of experiments to determine whether we could (1) use a monomer and copolymer never before used to make TEMs; and (2) systematically modulate reagents and reaction parameters to create a microsphere with heightened expansion. Both of these experimental goals lead to TEMs with enhanced potential for use in soft actuators for soft robotics, and the external surface of the microspheres is extremely important for current and future industrial applications.…”

“…To actualize TEMs' potential to contribute to next‐generation materials and manufacturing, both new TEM compositions and fundamental design parameters must be determined 4,15–17 . To this end, our interest in soft actuation methods led us to initiate a set of experiments to determine whether we could (1) use a monomer and copolymer never before used to make TEMs; and (2) systematically modulate reagents and reaction parameters to create a microsphere with heightened expansion.…”

Study on preparation and process of poly(MMA‐St) thermally expandablecore‐shellmicrospheres

“…The core-shell structure of the microspheres is controlled by thermodynamics under the optimal polymerization conditions. [11][12][13][14][15][16] Research on thermally expandable microspheres focuses mainly on the formulation of different monomer systems, 2,17,18 cross-linking agents, 1,19,20 and blowing agents, [21][22][23] as well as the morphology and the structure of the microspheres 24,25 and their expansion characteristics. 26,27 In addition, at present, poly(MMA-St) thermally expandable microspheres are mainly prepared by suspension polymerization and subsequent impregnated with a blowing agent, this method was performed via a two-stage process.…”