title: Acoustic study of a linear low-density polyethylene film after modification of the crystalline structure by heating.
abstract: We report on a hybrid microscopy technique that enables us to measure the acoustic properties of a thin polymer film together with an optical microscope image of the corresponding area. Linear low-density polyethylene films are heated to various temperatures and examined by the technique. Density of the film is increased by heating and its sound velocity is decreased compared with a film without heating. Also, spherulites can clearly be seen in the optical microscope image, supporting the thermal shrinkage of the film which can be detected by the present technique.
authors.affiliation: Department of Nanomechanics, Tohoku University, Aoba 6-6-01, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Hironori
authors.initials: H
authors.lastname: Tohmyoh
authors.affiliation: Department of Nanomechanics, Tohoku University, Aoba 6-6-01, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Sakamoto