TY - JOUR A1 - Wegener, Michael A1 - Wirges, Werner A1 - Fohlmeister, Jens Bernd A1 - Tiersch, Brigitte A1 - Gerhard, Reimund T1 - Two-step inflation of cellular polypropylene films: Void-thickness increase and enhanced electromechanical properties N2 - In cellular, electromechanically active polymer films, the so-called ferroelectrets, the cell size and shape distributions can be varied through a controlled inflation process. Up to now, high-pressure treatments were usually performed at elevated temperatures. There are, however, significant experimental limitations and complications if the pressure and temperature treatments are performed at the same time. Here, we demonstrate the controlled inflation of cellular polypropylene films by means of sepal-ate pressure and temperature treatments. Separate procedures are Much easier to implement. Excellent electromechanical properties were achieved with Such a two-step inflation process. The technique has significant potential for inflating large-area transducer films for electromechanical and electroacoustical applications Y1 - 2004 UR - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/15408 ER -