Journal
ACS APPLIED POLYMER MATERIALS
Volume 4, Issue 10, Pages 7081-7089Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.2c01013
Keywords
cryogel particles; inverse Leidenfrost phenomenon; super-macroporous structure; shape memory; surfactant-free
Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [26249116, 21H04628, 18H02005, 20K05198]
- JST SPRING [JPMJSP2138]
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A method to prepare cryogel particles with sponge-like mechanical properties, including high porosity and high elasticity, was reported. The method combines the inverse Leidenfrost effect with a cryopolymerization technique and does not require the use of surfactants.
Here, we report a method to prepare cryogel particles with sponge-like mechanical properties, including high porosity and high elasticity. The preparation process of the cryogel particles of poly(2-hydroxythyl methacrylate) can be summarized in the two following steps: preparation of frozen droplets using the inverse Leidenfrost effect, followed by cryo-gelation by frozen polymerization. First, a polymer precursor was dropwise added into bulk liquid nitrogen (-196 ?). Then, frozen droplets were created by the inverse Leidenfrost effect, which were subsequently polymerized in liquid paraffine (-15 ?). After thawing and drying, the cryogel particles were obtained. The monolithic super-macroporous structure was observed by scanning electron microscopy (SEM). The mechanical properties of the cryogel particles were studied via compression-swelling tests. At maximum compression, the particles achieved 94.3% degree of deformation; remarkably, they returned to their original shape under the swelling state. The strategy proposed herein, which combines the inverse Leidenfrost effect with a cryopolymerization technique, could be applied to prepare various polymer particles without employing surfactants.
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