Abstract
Emulsions containing 3% polyethylene were stabilized against coalescence in an asphalt medium by low molecular weight virgin polybutadiene and recycled styrene-butadiene stabilizers. The recycled styrene-butadiene steric stabilizer precursor was obtained as a thermo-mechanical devulcanized ground rubber tire in asphalt. The low molecular weight butadiene and styrenebutadiene rubbers were in situ reacted with sulfur in order to increase the compatibility of the stabilizer with the asphalt phase.
Because of the high molar volume of the asphalt phase and the similarity in contact energy between stabilizer and matrix phase, it is assumed that the stabilization is caused by entropic effects only. The fundamental aspects of elastic stabilization of polyethylene-asphalt emulsions are discussed. The total interaction free energy profile between the polyethylene particles shows that the efficiency of the steric stabilizer formation reaction can be improved significantly.
The use of devulcanized rubber tire as a replacement for the virgin polybutadiene precursor in the in situ stabilization process can significantly reduce the cost of the technology.
Similar content being viewed by others
References
Hesp SAM, Woodhams RT (1991) Colloid Polym, 269:825–834
Liang Z, Hesp SAM (1993) Colloids Surfaces (submitted for publication)
Evans R, Smitham JB, Napper DH (1977) Colloid Polym Sci 255:161–167
Hamaker HC (1937) Physica 4:399
Overbeek JThG (1952) In: Kruyt HR (ed) Colloid science. Elsevier Publishing Company, Amsterdam, Vol I, p 270
Napper DH (1983) Polymeric stabilization of colloidal dispersions. Academic Press, Sydney, Australia
Russel WB, Saville DA, Schowalter WR (1989) In: Colloidal dispersions. Cambridge University Press, Cambridge, England, p 315
Hough DB, White LR (1980) Adv Colloid Interface Sci 14:6
Parsegian VA and Ninham BW (1971) J Colloid Interface Sci 37(2):112
Hough DB, White LR (1980) Adv Colloid Interface Sci 14:29
Tagawa M, Gotoh K, Ikuta M (1990) Colloid Polymer Sci 268:589
Hesp SAM (1991) Ph.D. Thesis, University of Toronto, Toronto, Canada, pp 73–75
CRC Handbook of Chemistry and Physics, 61 st ed, CRC Press, Boca Raton, 1980, p E58
Barth EJ (1962) Asphalt Science and Technology. Gordon and Breach, N.Y., p 308
Gingell D, Parsegian VA (1973) J Colloid Interface Sci 44(3):456–463
Morawetz H (1965) Macromolecules in solution. John Wiley, N.Y., p 122
Kurata M, Tsunashima Y (1989) In: Bandrup J, Immergut EH (eds), Polymer handbook. John Wiley, New York, 3rd ed, p VII-33
Fischer EW (1950) Kolloid Z 160:1086
Dolan AK, Edwards SF (1974) Proc Roy Soc London A 337:509
The Asphalt Handbook, The Asphalt Institute, Manual Series No 4, Maryland, 1989
Ecoflex-Paving the way to a better world. Product literature, Bitumar Inc., Montreal, Quebec, 1993
Smitham JB, Napper DH (1976) J Colloid Interface Sci 54(3):468
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Morrison, G.R., Hedmark, H. & Hesp, S.A.M. Elastic steric stabilization of polyethylene-asphalt emulsions by using low molecular weight polybutadiene and devulcanized rubber tire. Colloid Polym Sci 272, 375–384 (1994). https://doi.org/10.1007/BF00659448
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00659448