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- W3104996282 abstract "Organic polymers can be made porous via continuous or discontinuous expansion processes in scCO2. The resulting foams properties are controlled by the interplay of three groups of parameters: (i) Chemical, (ii) physico-chemical, and (iii) technological/process that are explained in this paper. The advantages and drawbacks of continuous (extrusion, injection foaming) or discontinuous (batch foaming) foaming processes in scCO2, will be discussed in this article; especially for micro or nano cellular polymers. Indeed, a challenge is to reduce both specific mass (e.g., ρ < 100 kg·m−3) and cell size (e.g., average pore diameter ϕaveragepores < 100 nm). Then a particular system where small “objects” (coreshells CS, block copolymer MAM) are perfectly dispersed at a micrometric to nanometric scale in poly(methyl methacrylate) (PMMA) will be presented. Such “additives”, considered as foaming aids, are aimed at “regulating” the foaming and lowering the pore size and/or density of PMMA based foams. Differences between these additives will be shown. Finally, in a PMMA/20 wt% MAM blend, via a quasi one-step batch foaming, a “porous to nonporous” transition is observed in thick samples. A lower limit of pore size (around 50 nm) seems to arise." @default.
- W3104996282 created "2020-11-23" @default.
- W3104996282 creator A5038465864 @default.
- W3104996282 creator A5059026770 @default.
- W3104996282 date "2020-11-14" @default.
- W3104996282 modified "2023-09-27" @default.
- W3104996282 title "Amorphous Polymers’ Foaming and Blends with Organic Foaming-Aid Structured Additives in Supercritical CO2, a Way to Fabricate Porous Polymers from Macro to Nano Porosities in Batch or Continuous Processes" @default.
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- W3104996282 doi "https://doi.org/10.3390/molecules25225320" @default.
- W3104996282 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7696767" @default.
- W3104996282 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33202668" @default.