Abstract
Sheets from blends containing poly(butylene terephthalate) (PBT) and liquid crystalline polymer (LCP) were prepared using a twin-screw extruder. The LCP used is a copolymer composed of 20 mol % ethylene terephalate (PET) and 80 mol % p-hydroxybenzoic acid (PHB). Thermal behavior, viscoelastic properties, and structure of the sheets of various compositions were investigated by using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), microwave orientation analysis (MOA), and wide angle x-ray diffraction (WAXD). X-ray diffractograms of extruded sheets from PBT, LCP, and their blends show a high degree of orientation along extrusion direction. The orientation is mainly due to the high crystallization rate of PBT, although crystallization and orientation of PBT in the PBT and LCP blends could also be induced by adding LCP. In the PBT and LCP blends, the thermal properties of the constituents are slightly changed indicating that PBT and LCP are partially miscible. DSC measurements show that as the amount of LCP added to the blend increased, the melting point T m of PBT in the blends decreased. The single glass transition temperature T g for the PBT and LCP was observed by DMA. Furthermore, no evidence of transesterification in PBT and LCP blends was observed by WAXD.
Similar content being viewed by others
References
W. Brostow, Polymer 31 (1990) 779.
W. Brostow, T. Sterzynski and S. Triouleyre, ibid. 37 (1996) 1561.
W. Brostow, M. Hess, B. L. Lopez and T. Sterzynski, ibid. 37 (1996) 1551.
Roetting and G. Hinrichsen Adv. Polym. Technol. 13 (1994) 57.
Dutta, H. Fruitwala, A. Kohli and R. A. Weiss Polym. Eng. Sci. 30 (1990) 1005
Kimura and R. S. Porter J Polym. Sci. Polym. Phys. Ed. 21 (1983) 367.
Mencik, ibid. 13 (1975) 2173.
H. J. Ludwig and P. Eyerer, Polym. Eng. Sci. 28 (1988) 143.
M. Paci, C. Barone and P. L. Magagnini, J Polym. Sci. Polym. Phys. Ed. 25 (1987) 1595.
M. Pracella, D. Dainelli, G. Galli and E. Chiellini, Makromol. Chem. 187 (1986) 2387.
J. Chang and B. Jo, J. Appl. Polym. Sci. 60 (1996) 939.
L. A. Utracki, Polym. Eng. Sci. 23 (1983) 602.
K. G. Blizard and D. G. Baird, ibid. 27 (1987) 653.
D. Beery, S. Kenig and A. Siegmann, ibid. 31 (1991) 451.
Idem., ibid. 31 (1991) 459.
W. G. Perkins, A. M. Marcelli and H. W. Jr. Frerking, J. Appl. Polym. Sci. 43 (1991) 329.
M. S. Silverstein, A. Hiltner and E. Baer, ibid. 43 (1991) 157.
A. Datta, H. H. Chen and D. G. Baird, Polymer 34 (1993) 759.
S. Osaki, J. Appl. Phys. 64 (1988) 4181.
Idem., Polymer J. 29 (1997) 807.
A. Kaito, K. Nakayama and Zubaidi, J. Appl. Polym. Sci. 45 (1992) 1203.
M. Yokouchi, Y. Sakakibara, Y. Chatani, H. Tadokoro, T. Tanaka and K. Yoda, Macromolecules 9 (1976) 266.
I. M. Ward, in “Structure and Properties of Oriented Polymers,” edited by I. M. Ward (Chapman & Hall, London, 1997) p. 30
B. J. Reekmans and K. Nakayama, J. Appl. Polym. Sci. 62 (1996) 247.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Qi, K., Nakayama, K. Structure formation and miscibility of sheets from PBT and LCP blends. Journal of Materials Science 36, 3207–3213 (2001). https://doi.org/10.1023/A:1017934302816
Issue Date:
DOI: https://doi.org/10.1023/A:1017934302816