Reference : Polyimide foams derived from a high Tg polyimide with grafted poly(α-methylstyrene)
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/15444
Polyimide foams derived from a high Tg polyimide with grafted poly(α-methylstyrene)
English
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 mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Nov-1996
Polymer
Elsevier Sci Ltd
37
23
5229-5236
Yes (verified by ORBi)
International
0032-3861
Oxford
[en] nanostructured material ; nanofoam
[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.
Center for Education and Research on Macromolecules (CERM)
Researchers
http://hdl.handle.net/2268/15444
10.1016/0032-3861(96)00331-X
http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TXW-3VT9FYD-J-2&_cdi=5601&_user=532038&_orig=search&_coverDate=11%2F30%2F1996&_sk=999629976&view=c&wchp=dGLbVzW-zSkzS&md5=1f4700778797fdbee3c2e10d06f47410&ie=/sdarticle.pdf
http://www.elsevier.com/wps/find/journaldescription.cws_home/30466/description#description
The authors acknowledge Polymer (Elsevier) for allowing them to archive this paper.

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