1
|
Castelletto V, Newby GE, Hamley IW, Noirez L, Baroni P. Pressure effects revealed by small angle neutron scattering on block copolymer gels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:8319-8324. [PMID: 18564866 DOI: 10.1021/la801025n] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We study the effects of hydrostatic pressure (P) on aqueous solutions and gels of the block copolymer B(20)E(610) (E, oxyethylene; B, oxybutylene; subscripts, number of repeats), by performing simultaneous small angle neutron scattering/pressure experiments. Micellar cubic gels were studied for 9.5 and 4.5 wt % B(20)E(610) at T = 20-80 and 35-55 degrees C, respectively, while micellar isotropic solutions where studied for 4.5 wt % B(20)E(610) at T > 55 degrees C. We observed that the interplanar distance d 110 (cubic unit cell parameter a = [see text for formula]) decreases while the correlation length of the cubic order (delta) increases, upon increasing P at a fixed T for 9.5 wt % B(20)E(610). The construction of master curves for d(110) and delta corresponding to 9.5 wt % B(20)E(610) proved the correlation between changes in T and P. Neither d(110) and delta nor the cubic-isotropic phase transition temperature was affected by the applied pressure for 4.5 wt % B(20)E(610). The dramatic contrast between the pressure-induced behavior observed for 9.5 and 4.5 wt % B(20)E(610) suggests that pressure induced effects might be more effectively transmitted through samples that present wider domains of cubic structure order (9.5 wt % compared to 4.5 wt % B(20)E(610)).
Collapse
Affiliation(s)
- V Castelletto
- School of Chemistry, Food Biosciences and Pharmacy, The University of Reading, P.O. Box 226, Whiteknights, Reading, UK.
| | | | | | | | | |
Collapse
|
4
|
Walker TA, Raghavan SR, Royer JR, Smith SD, Wignall GD, Melnichenko Y, Khan SA, Spontak RJ. Enhanced Miscibility of Low-Molecular-Weight Polystyrene/Polyisoprene Blends in Supercritical CO2. J Phys Chem B 1999. [DOI: 10.1021/jp990551f] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Teri A. Walker
- Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, Corporate Research Division, The Procter & Gamble Company, Cincinnati, Ohio 45239, and Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - Srinivasa R. Raghavan
- Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, Corporate Research Division, The Procter & Gamble Company, Cincinnati, Ohio 45239, and Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - Joseph R. Royer
- Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, Corporate Research Division, The Procter & Gamble Company, Cincinnati, Ohio 45239, and Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - Steven D. Smith
- Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, Corporate Research Division, The Procter & Gamble Company, Cincinnati, Ohio 45239, and Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - George D. Wignall
- Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, Corporate Research Division, The Procter & Gamble Company, Cincinnati, Ohio 45239, and Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - Yuri Melnichenko
- Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, Corporate Research Division, The Procter & Gamble Company, Cincinnati, Ohio 45239, and Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - Saad A. Khan
- Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, Corporate Research Division, The Procter & Gamble Company, Cincinnati, Ohio 45239, and Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - Richard J. Spontak
- Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, Corporate Research Division, The Procter & Gamble Company, Cincinnati, Ohio 45239, and Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| |
Collapse
|