CORRELATION OF MORPHOLOGICAL AND PHYSICAL PROPERTIES OF ENCAPSULATION AND BACK SHEET MATERIALS AFTER AGING

摘要

In this work results of transmission electron microscopic on one TPO encapsulant and thermo analytical investigations on different polymer films used for photovoltaic devices are presented after a modified simulated weathering procedure. Back sheet material containing Polyethylene Terephthalate PET was tested. Besides PET-based back sheets, Ethylene Vinyl Acetate EVA and Thermoplastic Polyolefin TPO-based encapsulation films have been investigated as well. Results of Differential Scanning Calorimetry DSC show a change in melting and crystallization behavior, corresponding with lamellae diameter. Water vapor transmission WVTR rate is not significantly affected by aging processes.