Abstract
We used dilute solution viscometry, specifically, measurements of intrinsic viscosity and overlap concentration to characterize two members of the carbopol family, carbopols 940 and 941. These measured quantities were then used to calculate the swollen-to-dry volume ratios for both resins over a range of ionic strengths. The variation in this ratio is representative of the swelling equilibria of the micronetwork and is modeled using standard network theory with modifications for non-Gaussian chain statistics and for fixed charges on the chains. By fitting to experimental data, the cross-link density is determined as 1450 monomer units between cross-link sites for carbopol 940 and 3300 units for carbopol 941. The shear modulus of the microgel domain is then predicted from the swelling data and found to be an order of magnitude greater than the elastic modulus measured on concentrated carbopol dispersions. We argue that this discrepancy is due to a large number of defects which reduce the cycle rank of the network. Current microgel technology specifies that their rheological behavior can be predicted once the domain cross-link density is known. Simple dilute solution viscometry appears capable of providing this prerequisite.
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References
Brown HP: U.S. Patent 2,798,053
Goodrich BF: Technical Literature
Taylor NW, Bagley EB (1974) J Appl Polym Sci 18:2747
Fischer WH, Bauer WH, Wiberley SE (1961) Trans Soc Rheol 5:221
Testa B, Etter J-Cl (1973) Pharm Acta Helv 6/7:378
Taylor NW, Bagley EB (1977) J Appl Polym Sci 21:113
Taylor NW, Bagley EB (1975) J Polym Sci, Polym Phys Ed 13:1133
Steeneken PAM (1989) Carbohydrate Polymers 11:23
Taylor NW, Gordon SH (1982) J Appl Polym Sci 27:4377
Taylor NW, Bagley EB (1977) J Appl Polym Sci 21:1607
Ketz Jr RJ, Prud'homme RK, Graessley WW (1988) Rheol Acta 27:531
Wolfe MS, Scopazzi C (1989) J Colloid Interface Sci 133:265
Lange H (1986) Colloid Polym Sci 264:488
Holtus G, Borchard W (1989) Colloid Polym Sci 267:1133
Bohme G, Stenger M (1990) J Rheol 34:415
Antonietti M, Bremser W, Schmidt M (1990) Macromolecules 23:3796
Flory PJ (1953) Principles of polymer chemistry. Cornell University Press, Ithaca
Treloar LRG (1958) The physics of rubber elasticity Oxford University Press, London
Hasa J, Ilavsky M, Dusek K (1975) J Polym Sci: Polym Phys Ed 13:253
Katchalsky A, Michaeli I (1955) J Polym Sci 15:69
Vasheghani-Farahani E, Vera JH, Cooper DG, Weber ME (1990) Ind Eng Chem Res 29:554
Manning GS (1974) In: Selegny E (ed) Polyelectrolytes. Reidel Publishing Co., Dordrecht
Doi M, Edwards SF (1986) In: The theory of polymer dynamics. Clarendon Press, Oxford
Carnali JO, Naser MS, unpublished results
Stochkmayer WH, Fixman M (1963) J Polym Sci, Part C 1:137
Barnes HA, Hutton JF, Walters K (1989) in: An introduction to rheology. Elsevier, Amsterdam
Ferry JD (1989) In: Viscoelastic properties of polymers. John Wiley & Sons, New York
James HM, Guth E (1947) J Chem Phys 15:669
Flory PJ (1977) J Chem Phys 66:5720
Mark JE, Erman B (1988) In: Rubbetlike elasticity a molecular primer. John Wiley & Sons, New York
Candau S, Bastide J, Delsanti M (1982) Adv PolySci 44:27
Scanlan J (1960) J Polym Sci 43:501
Flory PJ (1982) Macromolecules 15:99
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Carnali, J.O., Naser, M.S. The use of dilute solution viscometry to characterize the network properties of carbopol microgels. Colloid Polym Sci 270, 183–193 (1992). https://doi.org/10.1007/BF00652185
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DOI: https://doi.org/10.1007/BF00652185