Dynamic Viscoelasticity of the Foam Rubber
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概要
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The authors constructed a simplified model of a twin transducer, and measured dynamic rigidity and Viscosity of various samples of the "foam rubber"(porous rubber made from natural rubber latex and several synthetic rubber latex) by observing the resonance frequency and the half value of the resonance curve in the low frequency region (ca. 50-70 cycles/sec). Marked amplitude dependence of the dynamic viscoelasticity was observed. In the case of the "foam "from natural rubber latex, dynamic rigidity decreases with the increase of the amplitude, while internal friction increases with the increase of the amplitude. In the case of the synthetic "foam"("PVC (polyvinyl chloride) foam" and "urethane foam"), however, both dynamic elasticity and viscosity decrease with the increase of the amplitude. When the foam rubbers absorb an amount of liquid, marked and interesting change of the dynamic properties is observed as follows. In the case of the foam rubber-silicone (non-solvent) system: An amount of high viscosity silicone oil (non-solvent) is made to permeate. Elasticity is unchanged, while the internal friction markedly increases. In the case of the foam rubber-mineral oil (poor solvent) system: Elasticity slightly decreases and internal friction slightly increases. This fact reminds us of a slight effect of swelling. In the case of the foam rubber-cyclohexane (good solvent) system: Elasticity markedly decreases and internal friction slightly decreases. This will be due to the swelling of the rubber matrix.
- 公益社団法人 高分子学会の論文
公益社団法人 高分子学会 | 論文
- 情報の入口--高分子センサ-とトランスデュ-サ- (情報化社会と高分子)
- 高分子科学最近の進歩--メルトレオロジ-(伸長粘度)
- 高分子系の相分離--特にポリマ-ブレンドについて
- 導電性高分子の磁気緩和--NMRT-1〓1の周波数依存性
- 多機能性高分子の合成 (化学修飾による多機能性高分子)