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- Title
Dynamic mechanical properties of three-component composites (acrylic polymer/epoxy/SiO<sub>2</sub>) in the glass-transition region.
- Authors
Uematsu, Hideyuki; Nishimoto, Takashi; Tanoue, Shuichi; Iemoto, Yoshiyuki; Aoki, Yuji; Sugimoto, Masataka; Koyama, Kiyohito
- Abstract
ABSTRACT In previous studies, we reported the linear and nonlinear rheological properties of three-component composites consisting of acrylic polymer (AP), epoxy resin (EP), and various SiO2 contents (AP/EP/SiO2) in the molten state. In this study, the dynamic mechanical properties of AP/EP/SiO2 composites with different particle sizes (0.5 and 8 μm) were investigated in the glass-transition region. The EP consisted of three kinds of EP components. The α relaxation due to the glass transition shifted to a higher temperature with an increase in the volume fraction (ϕ) for the AP/EP/SiO2 composites having a particle size of 0.5 μm, but the α relaxation scarcely shifted for the composite having a particle size of 8 μm as a general result. This result suggested that the SiO2 nanoparticles that were 0.5 μm in size adsorbed a lot of the low-glass-transition-temperature ( Tg) component because of their large surface area. The AP/SiO2 composites did not exhibit a shift in Tg; this indicated that the composite did not adsorb any component. The modulus in the glassy state ( E′ g) exhibited a very weak φ dependence for the AP/EP/SiO2 composites having particle sizes of 0.5 and 8 μm, although E′ g of the AP/SiO2 composites increased with φ. The AP/EP/SiO2 composites exhibited a peculiar dynamic mechanical behavior, although the AP/SiO2 composites showed the behavior of general two-component composites. Scanning electron microscopic observations indicated that some components in the EP were adsorbed on the surface of the SiO2 particles. We concluded that the peculiar behavior of the AP/EP/SiO2 composites was due to the selective adsorption of the EP component. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40409.
- Subjects
ACRYLATES; POLYMERS; EPOXY resins; SILICON compounds; GLASS transitions; SCANNING electron microscopy
- Publication
Journal of Applied Polymer Science, 2014, Vol 131, Issue 13, pn/a
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.40409