Shrinkage and viscoelastic behavior of alternative substrates for magnetic tapes

Weick, Brian L.; Bhushan, Bharat

doi:10.1109/20.490196

Cited by 23 publications

(14 citation statements)

References 3 publications

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“…The stress is assumed to be constant with time, which is consistent with the definition of creep compliance in eq. (2).…”

Section: Determination Of Long-term Strain Distributions In the Constmentioning

confidence: 95%

“…Determination of lateral strain and associated lateral contraction is important for tape designers who have to consider track misregistration (TMR). [1][2][3][4][5][6] Weick and Bhushan 6 provide examples for tape designers who need to determine lateral strain and contraction for magnetic tapes.…”

Section: Determination Of Long-term Strain Distributions In the Constmentioning

confidence: 99%

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Long‐term mechanical and viscoelastic behavior of constitutive polymeric materials used for magnetic tapes

Weick

Bhushan

2001

J of Applied Polymer Sci

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ABSTRACT:Creep-compliance behavior of specially prepared magnetic tape materials was measured at elevated temperature levels to facilitate the use of a time-temperature superposition (TTS) process. This TTS process allowed for the construction of master curves at a reference temperature of 30°C, which were used to predict the long-term viscoelastic behavior of the magnetic particle (MP) and metal-evaporated (ME) tapes used in the study. The specially prepared samples allowed for the use of a rule of mixtures technique to determine the long-term creep compliance of the front coat and back coat used for the magnetic tapes. To test the validity of this procedure, the front coat, substrate, and back coat data determined through separate experiments were used to calculate creep compliances of simulated tapes. These calculated creepcompliance curves were then compared to measured data for the actual magnetic tapes. After determination and validation of the front coat, substrate, and back coat creepcompliance data sets, they were used to determine strain distributions when the tapes are stored in a reel. Strain distributions were calculated for two cases, which reflect how tapes are stored in different drives: (1) the front coat (magnetic ϩ nonmagnetic layer) is oriented away from the hub, and (2) the front coat is oriented toward the hub. Results showed that strain in the critical front coat of a tape is lower if it is stored with the front coat oriented toward the hub. In addition, the use of the creep-compliance data showed that the MP tape front coat is more susceptible to creep than the ME tape front coat. The strain distributions in future magnetic tapes were also simulated by reducing the thickness and compliance of the layers. Results showed the importance of using lower compliance front coat, substrate, and back coat materials if thinner tapes are to be developed to increase the volume of information that can be stored in a magnetic tape reel.

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“…The stress is assumed to be constant with time, which is consistent with the definition of creep compliance in eq. (2).…”

Section: Determination Of Long-term Strain Distributions In the Constmentioning

confidence: 95%

Section: Determination Of Long-term Strain Distributions In the Constmentioning

confidence: 99%

Long‐term mechanical and viscoelastic behavior of constitutive polymeric materials used for magnetic tapes

Weick

Bhushan

2001

J of Applied Polymer Sci

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“…Such enhanced properties of PEN will favour its applications as films materials in electronics and packaging [3,4]. Drawing or stretching of films after extrusion induces an alignment of the polymer chains in the drawing directions and increases the degree of crystallinity [5].…”

Section: Introductionmentioning

confidence: 99%

Uniaxially stretched poly(ethylene naphthalene 2,6-dicarboxylate) films studied by broadband dielectric spectroscopy

Hakmé

Stevenson

David

et al. 2005

Journal of Non-Crystalline Solids

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“…[1][2][3][4] The complex orientation of industrially stretched PEN during a two step biaxial process was studied by the building of pole figures in a previous paper. 5 The establishment of relationships between microstructure and properties (dielectric or mechanical) is not straightforward, due to the complexity of the morphology.…”

Section: Introductionmentioning

confidence: 99%

Morphology and texture development of uniaxially stretched poly(ethylene naphthalene‐2,6‐dicarboxylate)

Douillard

Hakmé

David

et al. 2006

J of Applied Polymer Sci

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The texture development of PEN films with different semicrystalline morphologies have been studied by X-ray diffraction. These different structures have been obtained by uniaxially stretching PEN amorphous films at 100 and 1608C (below and above T g ) at different drawing ratios. Samples have also been characterized by DSC to determine the crystallinity ratios, the crystallization, and melting temperatures. To define the orientation of crystallites in the oriented samples, pole figures have been constructed, as a function of temperature and drawing ratio (DR) in the range 1.5-4. In the range from DR ¼ 2 to 4 the orientation is clearly uniplanar-axial. At T draw ¼ 1008C the crystallinity shown by DSC analysis is higher than the sample stretched at 1608C. The orientation is also higher when samples are stretched at 1008C. The naphthalene rings mainly stay in the plane of the film with a lower fraction perpendicular to the plane of the film.

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Shrinkage and viscoelastic behavior of alternative substrates for magnetic tapes

Cited by 23 publications

References 3 publications

Long‐term mechanical and viscoelastic behavior of constitutive polymeric materials used for magnetic tapes

Long‐term mechanical and viscoelastic behavior of constitutive polymeric materials used for magnetic tapes

Uniaxially stretched poly(ethylene naphthalene 2,6-dicarboxylate) films studied by broadband dielectric spectroscopy

Morphology and texture development of uniaxially stretched poly(ethylene naphthalene‐2,6‐dicarboxylate)

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