Viscoelastic properties of polymers. 4. Thermorheological complexity of the softening dispersion in polyisobutylene
Viscoelastic properties of polymers. 4. Thermorheological complexity of the softening dispersion in polyisobutylene
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DOI：
10.1021/ma00123a007
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发表时间：
1995-09
期刊：
影响因子：
5.5
通讯作者：
D. Plazek;I. Chay;K. Ngai;C. Roland
中科院分区：
文献类型：
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作者：
D. Plazek;I. Chay;K. Ngai;C. Roland
高分子量聚异丁烯的粘弹性行为已被重新审视，以研究独特的高频峰（或肩）看到的损失正切行为在玻璃橡胶软化分散体。在-74至+27°C的温度范围内进行的蠕变测量最初被简化为一条曲线，在从时间域到频域的转换中，产生了一个没有任何肩部的损耗切峰。原始的蠕变柔度曲线被独立地重新审视，曲线导数的微小变化揭示了难以捉摸的高频损失峰。额外的动态测量将转换后的蠕变数据与一些原始的Fitzgerald， Grandine和Ferry数据联系起来。[j]。综合结果涵盖了90多年的频率。这一广泛的范围表明，导致高频峰的机制与导致主损耗峰的机制具有不同的温度依赖性。
The viscoelastic behavior of a high molecular weight polyisobutylene has been revisited to investigate the unique high-frequency peak (or shoulder) seen in the loss tangent behavior in the glass to rubber softening dispersion. Creep measurements made in the temperature range -74 to +27 °C were initially reduced to a curve, which, upon transformation from the time to the frequency domains, yielded a loss tangent peak with no hint of any shoulder. The original creep compliance curves were rescrutinized independently, and slight variations in the derivatives of the curves revealed the elusive high-frequency loss peak. Additional dynamic measurements were made to connect the transformed creep data to some of the original Fitzgerald, Grandine, and Ferry data [J.Appl.Phys. 1953, 24, 911]. The combined results cover over 9 decades of frequency. This extensive range revealed that the mechanisms contributing to the high-frequency peak have a different temperature dependence than that of those contributing to the main loss peak.