Brief description：DMA直接测量粘弹性行为——储能模量(E')反映刚度和弹性，损耗模量(E'')反映阻尼和耗能，tan δ峰指示Tg。德汇代理TA Instruments DMA 850采用非接触式线性驱动和空气轴承，宽频率宽温度范围，是胶粘剂粘弹性表征的终极工具。
Industry Applications：压敏胶带储能模量(E')室温值测定——预判初粘力与剥离力；胶粘剂Tg的DMA精准测定(tan δ峰)——比DSC灵敏10-100倍；结构胶固化后储能模量温扫——确定材料使用温度上限；胶粘剂频率扫描——评估不同剥离速率下的粘弹性响应；振动阻尼胶带损耗因子(tan δ)表征等。
Detailed
Dynamic Mechanical Analyzers (DMA) hold an irreplaceable role in adhesive and new material R&D—they directly measure a material's viscoelastic behavior: storage modulus (E') reflects stiffness and elasticity, loss modulus (E'') reflects damping and energy dissipation, and the tan δ peak indicates Tg and energy dissipation characteristics. TA Instruments DMA 850, represented by Dehui, uses a non-contact linear drive motor and air bearings, providing high-precision modulus data over a wide frequency range (0.01-200 Hz) and temperature range (-150~600°C). For pressure-sensitive tapes, the storage modulus measured by DMA (typically 10⁴-10⁶ Pa at room temperature) is a key parameter to judge the viscoelastic balance; DMA temperature scan curves directly reveal the tape's usable temperature window—the area where the storage modulus drops sharply indicates the practical upper limit.
Industry Applications:
- Measuring room temperature storage modulus (E') of pressure-sensitive tapes—predicting initial tack and peel strength.
- Precise DMA measurement of adhesive Tg (tan δ peak temperature)—10-100 times more sensitive than DSC.
- Temperature scans of storage modulus for cured structural adhesives—to determine the material's usage temperature limit.
- Frequency scans of adhesives—to evaluate viscoelastic response at different peel rates.
- Loss factor (tan δ) characterization of vibration-damping tapes/damping adhesives—to optimize vibration reduction performance.
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