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首页> 外文期刊>Journal of Applied Polymer Science >Dynamic mechanical analysis of magnetic tapes at ultra-low frequencies
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Dynamic mechanical analysis of magnetic tapes at ultra-low frequencies

机译：磁带超低频动态力学分析

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A custom, ultra-low frequency, dynamic mechanical analyzer (ULDMA) has been developed to study the correlated effects of temperature and frequency on the viscoelastic behavior of magnetic tapes. It has been used to acquire data needed for the development of future magnetic tapes that require an archival life of up to 100 years. A range of elevated temperatures is used to simulate real-world storage environments, which enables the investigation of how the viscoelastic characteristics of tape samples influence the extent to which the tape deforms. The experiments and subsequent analysis examine the influence of the molecular structure on the viscoelasticity of magnetic tapes. Experiments were performed on a variety of magnetic tapes, including poly(ethylene terephthalate) (PET), poly(ethylene naphthalate) (PEN), metalized PET (M-PET), and metalized Spaltan (M-SPA). Additional experiments examined PEN and PET substrates by removing the front and back magnetic layers from the tape sample. Because of the viscoelastic behavior of the tapes, a time delay was present between the strain and stress signals, which was determined using a Fourier transform program. The elastic modulus (E), storage modulus (E'), loss modulus (E″), and loss tangent (tan δ) were obtained from the time delay for each of the ULDMA experiments at 25, 50, and 70°C over the frequency range of 0.0100-0.0667 Hz. Plots of these mechanical characteristics demonstrate the ability of frequency and temperature to affect trends associated with mechanical and thermal properties. Finally, some samples displayed an initial relaxation during the ULDMA experiments, which, when modeled using Maxwell's viscoelastic model, provided an insight into the relaxation characteristics of the samples.
机译：已经开发了一种定制的超低频动态机械分析仪（ULDMA），以研究温度和频率对磁带粘弹性行为的相关影响。它已用于获取未来磁带开发所需的数据，这些磁带需要长达100年的归档寿命。使用一定范围的高温来模拟现实世界的存储环境，这使人们能够研究胶带样品的粘弹性特性如何影响胶带变形的程度。实验和随后的分析检查了分子结构对磁带粘弹性的影响。在各种磁带上进行了实验，包括聚对苯二甲酸乙二醇酯（PET），聚萘二甲酸乙二醇酯（PEN），金属化PET（M-PET）和金属化Spaltan（M-SPA）。其他实验通过从胶带样品上去除正面和背面磁性层来检查PEN和PET基板。由于带的粘弹性行为，在应变信号和应力信号之间存在时间延迟，这是使用傅立叶变换程序确定的。弹性模量（E），储能模量（E'），损耗模量（E''）和损耗角正切（tanδ）是根据25、50和70°C下每个ULDMA实验的时间延迟得出的频率范围为0.0100-0.0667 Hz。这些机械特性的曲线图证明了频率和温度影响与机械和热特性相关的趋势的能力。最终，一些样品在ULDMA实验中显示出初始松弛，当使用麦克斯韦的粘弹性模型进行建模时，可以了解样品的松弛特性。

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