Abstract
We use ellipsometry to investigate a transition in the morphology of a sphere-forming diblock copolymer thin-film system. At an interface the diblock morphology may differ from the bulk when the interfacial tension favours wetting of the minority domain, thereby inducing a sphere-to-lamella transition. In a small, favourable window in energetics, one may observe this transition simply by adjusting the temperature. Ellipsometry is ideally suited to the study of the transition because the additional interface created by the wetting layer affects the polarisation of light reflected from the sample. Here we study thin films of poly(butadiene-ethylene oxide) (PB-PEO), which order to form PEO minority spheres in a PB matrix. As temperature is varied, the reversible transition from a partially wetting layer of PEO spheres to a full wetting layer at the substrate is investigated.
Similar content being viewed by others
References
F.S. Bates, G.H. Fredrickson, Annu. Rev. Phys. Chem. 41, 525 (1990).
G.H. Fredrickson, F.S. Bates, Annu. Rev. Mater. Sci. 26, 501 (1996).
M. Matsen, F. Bates, J. Chem. Phys. 106, 2436 (1997).
M. Matsen, J. Phys.: Condens. Matter 14, R21 (2002).
M. Turner, M. Rubinstein, C. Marques, Macromolecules 27, 4986 (1994).
M. Matsen, J. Chem. Phys. 106, 7781 (1997).
M. Fasolka, A. Mayes, Annu. Rev. Mater. Res. 31, 323 (2001).
P. Green, R. Limary, Adv. Colloid Interface Sci. 94, 53 (2001).
H. Xiang, K. Shin, T. Kim, S. Moon, T. McCarthy, T. Russell, Macromolecules 37, 5660 (2004).
H. Xiang, K. Shin, T. Kim, S. Moon, T. McCarthy, T. Russell, J. Polym. Sci., Part B: Polym. Phys. 43, 3377 (2005).
B. Yu, P. Sun, T. Chen, Q. Jin, D. Ding, B. Li, A. Shi, Phys. Rev. Lett. 96, 138306 (2006).
A. Croll, M. Massa, M. Matsen, K. Dalnoki-Veress, Phys. Rev. Lett. 97, 204502 (2006) ISSN 1079-7114
J. Kim, M. Matsen, Soft Matter 5, 2889 (2009) ISSN 1744-683X
T. Kim, J. Huh, C. Park, Macromolecules 43, 5352 (2010) ISSN 0024-9297
H. Tan, D. Yan, A. Shi, Macromolecules 37, 9646 (2004).
P. Mansky, T. Russell, C. Hawker, M. Pitsikalis, J. Mays, Macromolecules 30, 6810 (1997).
E. Huang, P. Mansky, T. Russell, C. Harrison, P. Chaikin, R. Register, C. Hawker, J. Mays, Macromolecules 33, 80 (2000).
H. Huinink, J. Brokken-Zijp, M. Van Dijk, G. Sevink, J. Chem. Phys. 112, 2452 (2000).
H. Yokoyama, T. Mates, E. Kramer, Macromolecules 33, 1888 (2000).
M. Fasolka, P. Banerjee, A. Mayes, G. Pickett, A. Balazs, Macromolecules 33, 5702 (2000).
L. Tsarkova, A. Knoll, G. Krausch, R. Magerle, Macromolecules 39, 3608 (2006).
G. Stein, E. Kramer, X. Li, J. Wang, Macromolecules 40, 2453 (2007).
G. Stein, E. Cochran, K. Katsov, G. Fredrickson, E. Kramer, X. Li, J. Wang, Phys. Rev. Lett. 98, 158302 (2007).
Y. Li, Y. Loo, R. Register, P. Green, Macromolecules 38, 7745 (2005).
Y. Huang, H. Chen, T. Hashimoto, Macromolecules 36, 764 (2003).
In order to obtain the sphere radius, we used the strong-stretching theory expression for domain size as described by Matsen and Bates bates1997 with experimental parameters for the sphere radius and volume fractions given for an equivalent system by similar system by Huang and co-workers [25].
C. Vasilev, H. Heinzelmann, G. Reiter, J. Polym. Sci., Part B: Polym. Phys. 42, 1312 (2004).
J. Carvalho, M. Massa, K. Dalnoki-Veress, J. Polym. Sci., Part B: Polym. Phys. 44, 3448 (2006).
J. Carvalho, M. Somers, K. Dalnoki-Veress, J. Polym. Sci., Part B: Polym. Phys. 49, 712 (2011).
R. Azzam, N. Bashara, S. Ballard, Phys. Today 31, 72 (1978).
C. Vasilev, G. Reiter, S. Pispas, N. Hadjichristidis, Polymer 47, 330 (2006).
P. de Gennes, F. Brochard-Wyart, D. Quéré, Capillarity and Wetting Phenomena (Springer-Verlag, New York Inc., 2002).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Carvalho, J.L., Massa, M.V., Cormier, S.L. et al. Reversible sphere-to-lamellar wetting transition at the interface of a diblock copolymer system. Eur. Phys. J. E 34, 51 (2011). https://doi.org/10.1140/epje/i2011-11051-6
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1140/epje/i2011-11051-6