Related Experiment Video
Updated: Jun 27, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
The complex influence of the oscillatory shear on the melt of linear diblock copolymers
Li-Yan You1, Yan-Dong He, Ying Zhao
1State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun, People's Republic of China.
Abstract:
The phase morphologies of symmetric linear diblock copolymers subjected to the oscillatory shear are investigated with the aid of dissipative particle dynamics simulations. The frequency dependent reorientations of the lamellar phase (LAM) have been identified. We find that the parallel orientation of LAM (i.e., the lamellar normal is parallel to the velocity gradient) appears at high shear frequency, whereas the perpendicular orientation of LAM (the lamellar normal being perpendicular to the velocity gradient) takes place at low shear frequency. In both of the cases, the reorientations undergo similar processes: the original LAM phase prepared in equilibrium breaks down rapidly, and it takes a very long time for the perfectly oriented LAM being reformed. Moreover, the shear-induced isotropic to lamellar phase transitions are observed when the oscillatory shear amplitude is large enough. It indicates that the shear amplitude plays a dominant role in the order-disorder transition. The viscosity and the modulus of the melt are found to be dependent on the shear amplitude and the shear frequency in a complex way.
More Related Videos
Related Concept Videos
Molecular Weight of Step-Growth Polymers
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Cationic Chain-Growth Polymerization: Mechanism
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
Fluid Mosaic Model
Anionic Chain-Growth Polymerization: Mechanism
Thin-Walled Hollow Shafts

