KOLLOID.ZEITSCHRIFT & ZEITSCHRIFT FUR POLYMERE ZUR ZEIT VEREINIGT MIT DEN KOLLOID-BEIHEFTEN 9ORGAN DEn KOLLOID-GESELLSCHAFT Band 201 Februar 1965 Heft 2 Polymere From the Department o/Applied Chemistry (1) and Department o/ Electronics (2), Faculty ol Engineering, Kyushu University, Fukuoka (Japan) Dielectric Behavior of Polychloroprene By Masato Matsuo (1), Y5ichi Ishida (1), Kaoru Yama/uji (2), Motowo Takayanagi (1) and Fu]io Irie (2) With 8 figures and 2 tables (Received September 15, 1964) Introduction The relationship between the chemical structure and the dielectric behavior of the linear high polymer has been usually in- vestigated by the series of polyacrylic esters, polyvinyl esters, polyvinyl ethers and so on. The purpose of this work is to investigate the effect of the structure of the side group on the dielectric behavior. It seems, however, to be also important to investigate the relationship between the dielectric behavior and the main chain structure of the polymer. In this paper, the authors report the result of the observation for the dielectric behavior of polyehloroprene, (--CH2--CCI=CH--CH~--)n, and try to com- pare it with that of polyvinyl chloride, (--CH2--CHC1--)n, reported in previous paper (1). The dielectric behavior of polychloroprenc was measured by Schneider et al. (2), but the temperature range of their observation was so narrow that they could observe only the ~a-absorption (high-temperature ab- sorption). The fla-absorption (low-temperature absorption) was, however, observed within our present observable frequency range (1 c/s ~ 106 c/s) by decreasing temperature. Experimental The samples used in this work were Polyehloroprene of Type W prepared by Dr. Mochel of Du Pont Co. Ltd. The samples for dielectric measurement were prepared by solvent casting, where benzene was used as a solvent. In order to remove the trace of the solvent remained in each sample, the sample set in the frame was kept for 2 weeks under the conditions of 10 -3 mmHg and 30 ~ Then the samples were coated with the conductive silver paint and were again dried under the conditions of 10 -8 mmHg and 30 ~ for 2 weeks. The procedure of the dielectric measurement is the same as that of the previous paper (1). Result The observed results for polychloroprene (PCP) are shown in Fig. 1-4 as the frequency i 20i o _4tq. 7 ~ L - 4~ ZO ~ I ~ - 54.5 !~ - -57.5 ~- 2qk ~' ~3 _ ~--61.5 ] " [~ * ~ - 72.5--~-- L I ~J ] 251 2 3 ,~ 5 log f (c/s) Fig. 1. The frequency dependences of ~' at various fixed temperatures for polychloroprene in the low temperature range t~ 0.O5 O.04 O.O3 O.O2 O.01 log f {c/s) Fig. 2. The frequency dependences of e" at various fixed temperatures for polyehloroprene in the low temperature range