Abstract
The structure, growth and morphology of calcium sulphate prepared in situ of a polymer has been investigated using polyethylene oxide as the growth medium. The structure was predominantly the dihydrate type with monoclinic configuration for these samples as compared to the anhydrite type with orthorhombic structure obtained in commercial samples. The crystal morphology consisted of sharp needle shape, having aspect ratio of more than 10. The concentration of the polymer used had a profound effect on the crystal size and its distribution. The size distribution became narrow and the average crystal size reduced with the increase of polymer concentration. Highly oriented crystals could be obtained with application of, small shearing force on the samples. These results have been explained on the basis of polymer mediated crystallization and large interaction between the filler and the matrix. © 1998 Chapman & Hall
Similar content being viewed by others
References
C. Vasile and R. B. Seymour, “Handbook of polyolefin” (Dekker, New York, 1993) Ch. 5, 9.
M. Fujiyama and T. Wakino, J. Appl. Polym. Sci. 43 (1991) 97.
Y. Suetsugu, Int. Polym. Process. 5 (1990) 184.
V. Malpass and J. Kenpthron, Plas. Compd. 12 (1989) 55.
K. T. Kollington in Polypropylene The Way Ahead, Proceedings in Conference, Madrid, Spain, PRI London, 1989, p. 81.
J. Krager kocsis, “Polypropylene structure, blends and composites” (Chapman & Hall, London, 1995).
F. Rybnikar, J. Appl. Polym. Sci. 27 (1982) 1479.
T. Kowaleski and A. Baleski, ibid. 32 (1986) 2919.
K. Mitsuishi, S. Ueno, S. Kodama and H. Kawasaki, ibid. 48 (1991) 204.
R. B. Seymour, in “Developments in plastic technology” Vol. 2, edited by A. Whelan and J. L. Craft (Elsevier Applied Science, London, 1985) p. 219.
P. J. Wright, in “Developments in plastic technology” Vol. 3, edited by A. Whelan and J. L. Craft (Elsevier Applied Science, London, 1986) p. 119.
S. F. Xavier and Y. N. Sharma, Angew. Makromol. Chem. 127 (1985) 145.
M. Fujiyama and T. Wakino, J. Appl. Polym. Sci. 42 (1991).
D. Hull, “Introduction to composite materials” (Cambridge University Press, Cambridge, 1981).
W. V. Titow and B. J. Lanham, “Reinforced thermoplastics” (Applied Science Publishers, London, 1975) p. 12.
S. Radhakrishnan and J. M. Schultz, J. Cryst. Growth 116 (1992) 378.
S. Radhakrishnan and D. R. Saini, ibid. 129 (1993) 191.
S. Radhakrishnan, ibid. 141 (1994) 437.
C. Saujanya and S. Radhakrishnan, J. Mater. Sci. 33 (1998) 1069.
J. V. Milewski and H. S. Katz, “Handbook of reinforcements for plastics” (Van Nostrand Reinhold, New York, 1987).
S. Radhakrishnan, C. R. Rajan and V. M. Nadkarni, J. Mater. Sci. 21 (1986) 597.
S. Radhakrishnan, K. Kane, K. Kadu and H. P. Natu, J. Appl. Polym. Sci. 58 (1995) 571.
ASTM Diffraction files 1-0999, 2-0134, 2-0675, 6-0046, ASTM, Washington, 1995.
E. C. S. Dickson and S. W. Binks, Phil. Mag. 2 (1952) 114.
G. C. H. Cheng and J. Zusman, Acta Cryst. 16 (1963) 767.
R. W. G. Wyckoff, “Crystal structures” Vol. 3 (John Wiley, New York, 1968) p. 18 and 642.
J. M. G. Cowie and S. H. Cree, Ann. Rev. Phys. Chem. 40 (1989) 85.
C. A. Vincent, Prog. Solid State Chem. 17 (1987) 145.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Saujanya, C., Radhakrishnan, S. Structure development in PP/CaSO4 composites: Part I Preparation of the filler by an in situ technique. Journal of Materials Science 33, 1063–1068 (1998). https://doi.org/10.1023/A:1004336517259
Issue Date:
DOI: https://doi.org/10.1023/A:1004336517259