Abstract
Blends of polycarbonate (PC) and linear low density polyethylene (LLDPE) of different compositions, in the form of slabs obtained by melt extrusion, have been examined by differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA).
DSC measurements show that the melting, crystallization and glass transition temperatures of the two polymeric components in the blends are slightly affected by the composition. On the contrary, large differences are observed in the melting behaviour of layers cut at various depths, parallel to the slab surfaces of samples. This supports the occurrence of different crystal morphologies and distribution of the two components within the samples. The study of the crystallization kinetics from the melt blends shows that the crystallization processes of LLDPE are affected by the presence of PC.
The dynamic mechanical analysis indicates that modulus, transitions and relaxational behaviour of the polymer components are scarcely affected by the composition. Some variations of the damping factor have been interpreted as due to the phase heterogeneity of the system, arising from the processing conditions and rheological behaviour of the blends.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
D. R. Paul andS. Newman, in “Polymer Blends” (Academic Press, New York, 1978).
A. Galeski, Z. Bartczak andM. Pracella,Polymer 25 (1984) 1323.
Z. Bartczak, A. Galeski andM. Pracella,ibid. 27 (1986) 537.
E. Butta, S. de Petris, M. Pasquini,J. Appl. Polym. Sci. 13 (1969) 1073.
W. Mielke,Polymer. Eng. Sci. 28 (1988) 1077.
N. K. Datta andA. W. Birley,Plastics and Rubber Process Appl. 2 (1982) 237.
Idem., ibid. 3 (1983) 237.
G. H. Edward,Brit. Polym. J. 18 (1986) 88.
E. Butta, VAMAS Technical Working Party on Polymer Blends, Report, Berlin, April 1987.
E. Martuscelli, M. Pragella, M. Avella, R. Greco andG. Ragosta,Makromol. Chem. 181 (1980) 957.
E. Martuscelli, M. Pragella, G. DellaVolpe andP. Greco,ibid. 185 (1984) 1041.
L. Mandelkern, in “Crystallization of Polymers” (McGraw-Hill, New York, 1964).
B. Wunderlich, in “Macromolecular Physics”, Vol 2 (Academic Press, New York, 1976).
N. G. McCrum, B. E. Read andG. Williams, in “Anelastic and Dielectric Effects in Polymeric Solids” (Wiley, London, 1967).
T. Murayama, in “Dynamic Mechanical Analysis of Polymeric Materials” (Elsevier, Amsterdam 1978).
N. G. McCrum, in “Molecular Basis of Transitions and Relaxations”, edited by D. J. Meyer (Gordon and Breach, New York, 1978).
E. Sacher,J. Macromol. Sci. -Phys. B9 (1974) 163.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Pracella, M., De Petris, S., Butta, E. et al. Polycarbonate-linear low density polyethylene blends: Thermal and dynamic-mechanical properties. J Mater Sci 25, 3693–3700 (1990). https://doi.org/10.1007/BF00575407
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00575407