Abstract
New and high performance damping materials from ethylene vinyl-acetate copolymer (VA content over 40%, shorted as EVM) and polylactic acid (PLA) blends were prepared with dicumyl peroxide (DCP) as the curing agent and triallyl isocyanurate (TAIC) as the curing coagent. The effects of silica, mesoporous silica and glass beads on the damping of the EVM/PLA blends were examined using a dynamic mechanical analyzer (DMA). The microstructures of the silica, mesoporous silica and glass beads were observed by transmission electron microscope (TEM). The dispersion of the fillers in the matrix was studied using a Rubber Process Analyzer (RPA). The results showed that silica filled blend had an effective damping temperature range (EDTR, tan δ > 0.3) of 81℃, while the mesoporous silica/silica and glass beads/silica filled blends had EDTR of 86℃ and 85℃, respectively. Mixtures of mesoporous silica and silica as well as glass beads and silica exhibited a more improved dispersion in the blends than silica alone. Blends filled with mesoporous silica and glass beads retained good mechanical properties as well as improved damping performance.
Highlights
Vibration often causes undesirable consequences, such as unpleasant motions, noise, and dynamic stresses, X
It can be seen that when EVM was blended with polylactic acid (PLA) and 30 phr silica, the effective damping temperature range (EDTR) of EVM/PLA blend was widened to 81 ̊C, despite a more reduction of the tan δ peak values
1) EVM700 was immiscible with PLA; the effective damping temperature range (EDTR) of the blends filled 30 phr silica was widened to 81 ̊C
Summary
Vibration often causes undesirable consequences, such as unpleasant motions, noise, and dynamic stresses,. Ethylene vinyl-acetate copolymers of high vinyl acetate content (EVM) [12]-[14] and polylactic acid (PLA) [15] have abundant ester groups, and can be used as damping materials due to their high tan δ values. Their Tg are some 70 ̊C apart and blending of EVM and PLA should enable a large effective damping temperature range (EDTR). The effects of inorganic fillers, including silica, mesoporous silica and glass beads, on the mechanical and damping properties, were examined in order to prepare new and better performance damping materials with wider EDTR
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