Expanding Monomers as Anti-Shrinkage Additives
| Autor: | Frank Wiesbrock, Philipp Marx |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Review General Chemistry Expanding Monomers volumetric expansion cationic ring-opening polymerization lcsh:QD241-441 chemistry.chemical_compound symbols.namesake Monomer chemistry Chemical engineering Polymerization lcsh:Organic chemistry Covalent bond symbols Molecule van der Waals force expanding monomer volumetric shrinkage Volumetric shrinkage Shrinkage radical ring-opening polymerization |
| Zdroj: | Polymers, Vol 13, Iss 806, p 806 (2021) Polymers |
| ISSN: | 2073-4360 |
| Popis: | Commonly, volumetric shrinkage occurs during polymerizations due to the shortening of the equilibrium Van der Waals distance of two molecules to the length of a (significantly shorter) covalent bond. This volumetric shrinkage can have severe influence on the materials’ properties. One strategy to overcome this volumetric shrinkage is the use of expanding monomers that show volumetric expansion during polymerization reactions. Such monomers exhibit cyclic or even oligocyclic structural motifs with a correspondingly dense atomic packing. During the ring-opening reaction of such monomers, linear structures with atomic packing of lower density are formed, which results in volumetric expansion or at least reduced volumetric shrinkage. This review provides a concise overview of expanding monomers with a focus on the elucidation of structure-property relationships. Preceded by a brief introduction of measuring techniques for the quantification of volumetric changes, the most prominent classes of expanding monomers will be presented and discussed, namely cycloalkanes and cycloalkenes, oxacycles, benzoxazines, as well as thiocyclic compounds. Spiroorthoesters, spiroorthocarbonates, cyclic carbonates, and benzoxazines are particularly highlighted. |
| Databáze: | OpenAIRE |
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