Relationships between lateral force and viscoelastic properties for amorphous polymer films based on lateral force microscopy |
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Authors: | Won -Ki Lee Jeong -Sik Yoon Keiji Tanaka Noriaki Satomi Xiqun Jiang Atsushi Takahara Chang -Sik Ha Tisato Kajiyama |
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Affiliation: | (1) Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka 812-81, Japan, JP;(2) Present address: Korea Institut of Footwear Technology, Pusan 614-600, Korea, KP;(3) Department of Polymer Science and Engineering, Pusan National University, Pusan 609-735, Korea, KP |
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Abstract: | Summary. The relationships between lateral force and viscoelastic properties of amorphous polymer surfaces with Tg's lower and higher
than room temperature (295 K, RT) and their blend systems have been studied on the basis of lateral force microscopic (LFM)
measurement. Under the conditions of scanning rate of 102–105 nm sec-1, normal load of 5 nN and RT, the lateral forces of poly(methyl methacrylate) (PMMA) and polyisoprene (PI) homopolymers with
Tg's fairly higher and lower than RT, respectively, did not depend on the scanning rate. Whereas, the lateral force of poly(methyl
acrylate) (PMA) with Tg ≤ RT decreased with an increase in the scanning rate. Also, poly(vinyl acetate) (PVAc) with Tg ≥ RT
showed slight dependence on the scanning rate. The scanning rate dependence of lateral force was similar to the frequency
dependence of mechanical loss modulus. The results indicate that the magnitude of lateral force strongly depends on the state
of thermal molecular motion. The lateral force-viscoelastic properties of miscible polymer blends was also investigated by
LFM.
Received: 30 June 1997/Revised: 24 July 1997/Accepted: 29 July 1997 |
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