Preparation and Characterization of Nanocellular Poly(phenylquinoxaline) Foams. A New Approach to Nanoporous High-Performance Polymers

详细信息    查看全文

• 作者：Samuel Merlet ; Catherine Marestin ; Fré ; deric Schiets ; Olivier Romeyer ; Ré ; gis Mercier
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：March 20, 2007
• 年：2007
• 卷：40
• 期：6
• 页码：2070 - 2078
• 全文大小：583K
• 年卷期：v.40,no.6(March 20, 2007)
• ISSN：1520-5835

文摘

This work deals with a new strategy for the elaboration of macro- to nanoporous materials. Theadopted scheme involves the in-situ generation of foaming agents (CO₂ and isobutene) during the thermal treatmentof a poly(phenylquinoxaline) (PPQ) film bearing thermolabile (tert-butyloxycarbonyl, i.e., Boc) groups (PPQ-Boc). For this purpose, a bis-diketone monomer having phenolic groups has been first synthesized and polymerizedwith a bis-diamine monomer. The resulting PPQ was postmodified by introducing Boc groups. After a kineticand mechanistic study of the Boc thermal decomposition reaction, the influence of different experimental parameterson the final porosity formation has been investigated, such as the foaming temperature which is a key parameter.The porous materials obtained were characterized by different techniques (density, SEM, TEM) in order todetermine the cell density as well as the size and morphology of the porous structure. Depending on the thermaltreatment conditions, our strategy enables to obtain a wide range of porous materials, from nanoporous (10 nm,10¹⁶ cells/cm³) to macroporous (200-700 nm, 10¹² cells/cm³).