Polymerを用いて作製したバルーンの周波数特性について

概要

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In order to find out some suitable materials for making airfilled balloon from a variety of polymeric substances, the present experiment was performed. Considering the chemical and physical properties of the materials, polyurethanes, Polypropylene, Polyethylene and polyvinylidine copolymer (Saran) were chosen.<BR> High frequency characteristics were generally seen in the polyurethanes, but air-leaking hindered the use of the materials except E. C. D. which was the most statisfactory material in the present experiment, because of ease of fabrication, low permeability to air and high frequency characteristics. Lineality, low permeability to air, and very high frequency characteristics were seen in Saran. However, a slight hysteresis was noticed in small size balloon. Polypropylene and Polyethylene were available in the film and heat sealing was necessary for making the balloon. Although this may explain partly the reason for the low frequency characteristics, 5 % flat ranges for these two materials were up to 6.3 and 1.2c.p.s., respectively. Polyethylene gave the third order response to the square wave pressure change.
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