Cast-extruded syndiotactic polypropylene films: preliminary structural and mechanical results |
| |
| Authors: | Liberata Guadagno Carlo Naddeo Concetta D'Aniello Luciano Di Maio Vittoria Vittoria Domenico Acierno |
| |
| Institution: | 1. Department of Chemical and Food Engineering, University of Salerno, Via Ponte Don Melillo, 84084 Fisciano - SA, Italy;2. Department of Materials and Production Engineeering, University of Naples “Federico II” - Piazzale Tecchio, 80100 Napoli, Italy |
| |
| Abstract: | Syndiotactic polypropylene (sPP) was cast-extruded with a laboratory single screw extruder, obtaining a crystalline and still highly transparent film. The structural studies showed that the film crystallized at room temperature in the disordered helical form I, containing a fraction of a mesophase with the chains in trans-planar conformation. X-ray patterns, taken either along the extrusion direction (MD) or along the orthogonal directions (TD and ND), indicated a low orientation of the c axis parallel to the machine direction (MD) and a partial orientation of the a axis along the transverse direction (TD). Mechanical properties performed in either direction showed a very similar behaviour, but a different strain at the breaking point. The mechanical parameters were derived in both directions. |
| |
| Keywords: | |
|
|
