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Molecular weight effect on the obtainment of parallel and perpendicular orientation in thermotropic poly(diethylene glycol p,p′-bibenzoate)

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Summary

The effect of molecular weight on the uniaxial orientation process has been analyzed in two samples of thermotropic poly(diethylene glycol p,p′-bibenzoate), evaluating the influence of that parameter on the type of orientation obtained. Several strain rates and deformation temperatures have been tested in order to map out the conditions for obtaining the two different kinds of orientation. The results show that in the lower molecular weight PDEB sample (Mw=31200) it is rather easy to get exclusively perpendicular “anomalous” orientation, with the molecular axes aligned transversely to the stretching direction. However, it is extremely difficult to obtain 100% parallel “normal” orientation. On the contrary, either type of orientation or a mixture of them can be easily developed for the higher molecular weight PDEB sample (Mw=102900).

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Authors and Affiliations

  1. Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva 3, 28006, Madrid, Spain

    Vanesa Rodríguez-Amor, Juan P. Fernández-Blázquez, Antonio Bello, Ernesto Pérez & María L. Cerrada

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  1. Vanesa Rodríguez-Amor
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  2. Juan P. Fernández-Blázquez
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  3. Antonio Bello
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  4. Ernesto Pérez
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  5. María L. Cerrada
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Correspondence to Ernesto Pérez.

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Rodríguez-Amor, V., Fernández-Blázquez, J., Bello, A. et al. Molecular weight effect on the obtainment of parallel and perpendicular orientation in thermotropic poly(diethylene glycol p,p′-bibenzoate). Polym. Bull. 60, 89–96 (2008). https://doi.org/10.1007/s00289-007-0830-5

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  • DOI: https://doi.org/10.1007/s00289-007-0830-5

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