Mingvanish, Withawat, Kelarakis, Antonios, Mai, Shao-Min, Daniel, Christophe, Yang, Zhuo, Havredaki, Vasiliki, Hamley, Ian W., Ryan, Anthony J. and Booth, Colin (2000) Rheology and structures of aqueous gels of diblock(oxyethylene/oxybutylene) copolymer E22B7. The Journal of Physical Chemistry B, 104 (42). pp. 9788-9794. ISSN 1520-6106
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Official URL: http://dx.doi.org/10.1021/jp001398o
The phase behavior of an oxyethylene/oxybutylene diblock copolymer (E22B7) in aqueous solution was defined using three properties: yield stress (by rheometry and tube inversion), dynamic modulus (by rheometry), and structure (by small-angle X-ray scattering). The boundary of immobile, structured gel (hard gel) was detected by all three methods, giving satisfactory agreement. A structural transition within the hard gel, from bcc to hex, was detected by rheometry and SAXS. Two types of soft gel were detected and assigned to disordered phases containing either spherical or cylindrical micelles. Comparison with results for other diblock EmBn copolymers showed a regularity of behavior influenced largely by oxyethylene-block length, with oxybutylene-block length having a minor but significant role.
|Subjects:||Physical sciences > Chemistry|
|Schools:||Faculty of Science and Technology > School of Physical Sciences and Computing|
|Deposited By:||Antonios Kelarakis|
|Deposited On:||05 Nov 2013 14:05|
|Last Modified:||09 Aug 2016 15:20|
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