TY - GEN
T1 - Relation between morphology change due to mechanical kneading and dielectric breakdown characteristics in ethylene-styrene copolymers
AU - Tanaka, Yasuhiro
AU - Otsubo, Toshinobu
AU - Ohki, Yoshimichi
AU - Ikeda, Masaaki
AU - Yazaki, Fumihiko
PY - 1991/12/1
Y1 - 1991/12/1
N2 - The relation between morphological change, induced by copolymerized benzene rings or by kneading, and the dielectric strength of ethylene-styrene copolymer was studied. In unkneaded samples, the lamellar thickness decreases and the lattice constant along the a-axis increases with increasing styrene content. However, in kneaded samples, the lamellar thickness and the lattice constant remain constant up to a styrene content of 3.10 wt%. Spherulite is observed with a polarizing microscope in unkneaded samples, but it disappears in kneaded samples. Kneaded samples, especially the kneaded sample with a styrene content of 3.10 wt%, have higher breakdown strength than unkneaded samples. The styrene content of the sample showing the highest breakdown strength increases as the temperature decreases. At -50°C or -80°C, the sample with a styrene content of 15.40 wt% has the highest breakdown strength of all the samples. It is considered that benzene rings are moved to the interfacial region between lamellar and amorphous parts by kneading and hinder the acceleration of electrons along the lamellae. This effect of benzene rings becomes pronounced in the low-temperature region where the breakdown process is electronic.
AB - The relation between morphological change, induced by copolymerized benzene rings or by kneading, and the dielectric strength of ethylene-styrene copolymer was studied. In unkneaded samples, the lamellar thickness decreases and the lattice constant along the a-axis increases with increasing styrene content. However, in kneaded samples, the lamellar thickness and the lattice constant remain constant up to a styrene content of 3.10 wt%. Spherulite is observed with a polarizing microscope in unkneaded samples, but it disappears in kneaded samples. Kneaded samples, especially the kneaded sample with a styrene content of 3.10 wt%, have higher breakdown strength than unkneaded samples. The styrene content of the sample showing the highest breakdown strength increases as the temperature decreases. At -50°C or -80°C, the sample with a styrene content of 15.40 wt% has the highest breakdown strength of all the samples. It is considered that benzene rings are moved to the interfacial region between lamellar and amorphous parts by kneading and hinder the acceleration of electrons along the lamellae. This effect of benzene rings becomes pronounced in the low-temperature region where the breakdown process is electronic.
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M3 - Conference contribution
AN - SCOPUS:0026279224
SN - 0879425687
T3 - Proc 3 Int Conf Prop Appl Dielectr Mater
SP - 1169
EP - 1172
BT - Proc 3 Int Conf Prop Appl Dielectr Mater
PB - Publ by IEEE
T2 - Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials
Y2 - 8 July 1991 through 12 July 1991
ER -