Molecular Aggregation Structure of Notched Nylon 12 Film during Uniaxial Elongation

English Abstract

Molecular Aggregation Structure of Notched Nylon 12 Film during Uniaxial Elongation

Nobuhisa TAKAYAMA ^*1

Akihiko TAKADA ^*2

Ken KOJIO ^{*1 *2 *3}

Atsushi TAKAHARA ^{*1 *2 *3}

^*1:Graduate School of Engineering, Kyushu University, Nishi-ku, Fukuoka, Japan

^*2:Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-ku, Fukuoka, Japan

^*3:WPI-I2CNER, Kyushu University, Nishi-ku, Fukuoka, Japan

Nippon Gomu Kyokaishi,(2021),94(9),293-298 Original Paper in Japanese

Polarizing observation was carried out for nylon 12 (Ny12) films with a notch of ca. 0.2 mm length during uniaxial elongation. As the result, a ductile deformation behavior was detected, and a X-shaped area with higher retardation was observed around the notch extending to 45° inclined direction to the uniaxial elongation direction. Moreover, during the uniaxial elongation, in-situ wide angled X-ray diffraction (WAXD) measurement were performed at various positions in the Ny12 film specimens. As a result, a crystal phase transition from γ-crystal to α-crystal seemed to occur in the region where higher retardations were observed. Since the intrinsic birefringence in α-crystal is higher than those in γ-crystal and amorphous phases, the increase in retardation can be caused by increase of α-crystalline fraction.

(Received on April 14, 2021)
(Accepted on July 21, 2021)

Keywords: Nylon 12, Notch, Uniaxial Elongation, Ductile Behavior, Wide-angle X-ray Diffraction, Retardation