01203naa a2200193 a 450000100080000000500110000800800410001910000200006024500550008026000090013552006720014465300150081665300260083165300160085770000170087370000200089070000220091077300770093210288082010-03-03       2004    bl ---       0--  u    #d1 aMALMONGE, J. A.  aInfluence of solvents on polyurethane preparation.  c2004  aPolyurethane, characterized by -NH-CO-Q- groups, has been used as a polyrner matrix to produce piezo- and pyroelectric composites [1,2] and blends with conductive polyrners, such as polyaniline doped with p-toluene sulphonic acid(TSA) [3]. During the preparation of polyurethane(PUR) films air bubbles may be formed when using lhe pre-polyrner method (two-step process). We have observed that lhe use of some solvents like N-methyl-2- pyrrolidinone (NMP) and chloroform, drastically diminished these bubbles. In lhe present work we studied lhe influence of NMP and chloroform on lhe chemical reaction of pre-polyrner with polyol during polyurethane (PUR) preparation.  aPolímeros  aPolímeros condutores  aPoliuretano1 aALVES, W. F.1 aKANDA, D. H. F.1 aMATTOSO, L. H. C.  tIn: WORLD POLYMER CONGRESS-MACRO 2004. Paris, 2004. Anais...Paris, 2004.