Affiliation: | (1) Ecole Nationale Supérieure de Chimie, F-68200 Mulhouse, France;(2) Present address: Central Laboratory, Solvay S.A., rue de Ransbeek 310, B-1120 Brussels, Belgium;(3) Present address: Dept. Polymères, Groupement de Recherche de Lacq, F-64170 Artix, France |