Polyethylene Teraphthalate Research Articles

A comparison of the transmission properties of 1 μm and 6 μm polypropylene flow counter windows

AbstractOver recent years, some confusion has arisen regarding the transmission properties of commercially available frame‐mounted polypropylen flow counter windows compared to those of the loose sheet polyethylene teraphthalate (Mylar) material previously available. Experimental results obtained for Ca to F Kα characteristic radiations inclusive enable the transmissions of 6 μm Mylar 1 μm polypropylene to be calculated which in turn are compared to earlier published data.

A broadband polymeric foil transducer

If a 0.001 in (0.025 mm) thick foil of polyethylene teraphthalate is metallized upon one side and a dc voltage is applied to the metallizing, then the foil will adhere firmly by electrostatic attraction to any conducting surface. In acoustic emission experiments with such a foil as a capacitance detector it was observed that by cycling the polarizing voltage it was possible to increase the sensitivity of the device until it was only 30 dB below that of a damped pzt transducer. Such an enhanced response probe has been found to have a frequency response which is flat from 10 kHz to 5 MHz. It also has the advantages of being lightweight; needs no coupling agent when applied to conducting substrates; is stable over long periods; can be made in any shape or array of shapes and will conform to curved surfaces