Abstract
In this research, ethylene-vinyl acetate rubber (EVM)/polylactic acid (PLA) = 80/20 by weight blend was compounded with silica in a Haake torque rheometer. The effects of hindered phenol (AO-60), super branched polyol, petroleum resin C9, polyvinyl chloride (PVC) and acrylic rubber (ACM) on the damping properties of blends were investigated by dynamic mechanic analyzer (DMA). The results showed that 20 phr super branched polyol significantly increased the damping factor of PLA to widen the effective damping temperature range from 42.1℃to 102.5℃. 15 phr AO-60 and 10 phr petroleum resin C9 both dramatically raised the blend’s damping factor to broaden the effective damping temperature range to 98.0℃ and 102.6℃, respectively. ACM and PVC are compatible with EVM, and both improved the damping properties of EVM/PLA blends.
Highlights
Polymeric damping materials are functional materials having polymer matrices and are widely used for vibration and noise reduction [1]-[3]
Hindered phenol AO-60, super branched polyol and petroleum resin C9 with molecular weights of 1177, 1101 and 2000 were chosen as the organic hybrid agents for EVM/Polylactic acid (PLA) blends due to their mode rate molecular weight as well as the abundant hydroxyl groups, which could act as hydrogen bond donors
polyvinyl chloride (PVC) and ACM both with high damping factors were used as a third polymer component in the EVM/PLA blends to examine the effects on the damping properties
Summary
Polymeric damping materials are functional materials having polymer matrices and are widely used for vibration and noise reduction [1]-[3]. For outdoor or machinery applications, good damping materials should exhibit a high loss factor (tanδ ≥ 0.3) over a wide temperature range [5]-[7]. The glass transition zone of EVM is between −5 ̊C and 30 ̊C, which is a typical temperature range for damping applications. EVM/PLA = 80/20 was chosen as blend matrix having abundant ester groups (hydrogen bond accepters). Hindered phenol AO-60, super branched polyol (made in our laboratories) and petroleum resin C9 with molecular weights of 1177, 1101 and 2000 were chosen as the organic hybrid agents for EVM/PLA blends due to their mode rate molecular weight as well as the abundant hydroxyl groups (in AO-60 and the polyol), which could act as hydrogen bond donors. PVC and ACM both with high damping factors were used as a third polymer component in the EVM/PLA blends to examine the effects on the damping properties. The aim was to prepare high performance damping materials with wider damping temperature ranges
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