Sage Journals: Discover world-class research

Abstract

The effect of mechanical deformation on filament structure has been evaluated using a viscoelastometer. As a result of cyclic twisting, or torsional deformation, the fiber structure tends to disorient and behave more like an amorphous system where the loss factor (tan δ) increases as deformation cycles increase. Tensile cyclic loading, on the other hand, improves the orientation function as determined by sonic data, which include contributions from both the amorphous and the crystalline fractions as well as lateral order, as revealed by x-ray fiber diagrams. These structural changes give rise to lower values of tan δ. The decreased height and increased width of the loss peak at the a transition temperature substantiate the assumption that cyclic tensile loading improves orientation and lateral order through relaxation and strain condi tioning.

Get full access to this article

View all access options for this article.

References

Biangardi, H.J. , and Zachmann, H.G. , Influence of the Arrangement of the Crystals and Structure of the Non-crystalline Regions on the Mechanical Properties of Poly(ethylene Terephthalate), J. Polym. Sci. Polym. Symp. 58, 169 (1977).

Chauhan, R.S. , Mechanical and Structural Properties of Fibrous Polymers, Doctoral thesis, University of Gujarat, India, 1983.

De Vries, A.J. , Bornebat, C. , and Beautemps, J. , Uni-and Biaxial Orientation of Polymer Films and Sheets, J. Polym. Sci. Polym. Symp. 58, 109 (1977).

Grover, E.B. , Dillion, J.H. , and Suppiger , E.W. , Correlation of Fatigure with the Dynamic Modulus of Polymers, Textile Res. J. 36, 346 (1966).

Heuvel, H.M. , and Huisman, R. , Effect of Winding Speed on the Physical Structure of As-spun Poly(ethylene Terphthalate) Fibres Including Orientation Induced Crystallization, J. Appl. Polym. Sci. 22, 2229 (1978 ).

Hoffman, J.D. , Williams, G. , and Passaglia, E. , Analysis of the α, β and γ Relaxations in Polychlorotrifluroethylene and Polyethylene: Dielectric and Mechanical Properties, J. Polym. Sci. Part C 14, 173 (1966).

Marikhin, V.A. , and Myasnikova, L.P. , The Role of Interfibrillar Tie Molecules in Drawing of Polymers, J. Polym. Sci. Polym. Symp. 58, 97 (1977).

Miller, R.W. , and Murayama, T. , Dynamic Mechanical Properties of Partially Oriented Polyester (POY) and Draw Textured Polyester (DTY) Yarns , J. Appl. Polym. Sci. 29, 933 (1984).

Moseley, W.W. , The Measurement of Molecular Orientation in Fibers by Acoustic Methods , J. Appl. Polym. Sci. 3, 266 (1960).

10.

Murayama, T. , "Dynamic Mechanical Analysis of Polymetric Material," Material Science Monographs, Elsevier Scientific Publishing Company, New York, 1978 .

11.

Popli, R. , Glotin, M. , Mandeikern, L. , and Benson, R.S. , Dynamic Mechanical Studies of α and β Relaxations of Polyethylenes , J. Polym. Sci. Polym. Phy. Ed. 22, 407 (1984).

12.

Rao, M.V.S. , Structure Property Correlationships in Polyester, Doctoral thesis, University of Gujarat, India, 1982.

Dynamic Mechanical Properties of Mechanically Deformed Filaments

Abstract

Get full access to this article

References