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Polyimide foams derived from a high Tg polyimide with grafted poly(α-methylstyrene)
Hedrick, James L; DiPietro, R.; Plummer, C. J. G. et al.
1996In Polymer, 37 (23), p. 5229-5236
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Keywords :
nanostructured material; nanofoam
Abstract :
[en] A new route to high-Tg, thermally stable polyimide foams has been developed. Foams were prepared by casting microphase-separated graft copolymers comprising a thermally stable main chain, polyimide, and a thermally labile graft, poly(α-methylstyrene). The copolymer compositions were designed so that the thermally labile block would be the dispersed phase. This can unzip to its monomer upon heating, and the decomposition product diffuses out of the film, leaving pores embedded in a matrix of the thermally stable component. The copolymers were synthesized through either the poly(amic acid) precursor, followed by chemical cyclodehydration to the imide form, or the poly(amic alkyl ester) precursor followed by thermal imidization. The decomposition of the α-methylstyrene in the block copolymer was studied by thermogravimetric, dynamic mechanical and thermomechanical analyses. Mild decomposition conditions were required to avoid rapid depolymerization of the α-methylstyrene and excessive plasticization of the polyimide matrix. The foams showed pore sizes with diameters ranging from less than 20 nm to over 1 µm, depending upon the synthetic route employed, and the reduction in the mass density was generally consistent with the starting composition.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering
Chemistry
Author, co-author :
Hedrick, James L;  IBM Almaden Research Center, San Jose, USA
DiPietro, R.;  IBM Almaden Research Center, San Jose, USA
Plummer, C. J. G.;  Ecole Polytechnique Federale de Lausanne, Switzerland
Hilborn, J.;  Ecole Polytechnique Federale de Lausanne, Switzerland
Jérôme, Robert ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Polyimide foams derived from a high Tg polyimide with grafted poly(α-methylstyrene)
Publication date :
November 1996
Journal title :
Polymer
ISSN :
0032-3861
eISSN :
1873-2291
Publisher :
Elsevier Sci Ltd, Oxford, United Kingdom
Volume :
37
Issue :
23
Pages :
5229-5236
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 26 June 2009

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