6533b83afe1ef96bd12a792a
RESEARCH PRODUCT
Rheological modifiers based on supramolecular block copolymers: From weak associations to interconnected micelles
Mostafa AhmadiMostafa AhmadiSeyed Reza GhaffarianEvelyne Van RuymbekeAmir JangizehiAmir JangizehiBart GoderisHadi GoldansazOlivier VerkinderenGoolia Nikravansubject
AcrylateMaterials sciencePolymers and PlasticsSmall-angle X-ray scatteringHydrogen bondGeneral Chemical EngineeringRelaxation (NMR)Supramolecular chemistry02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesBiochemistryMicelle0104 chemical scienceschemistry.chemical_compoundchemistryChemical engineeringRheologyMaterials ChemistryCopolymerEnvironmental Chemistry0210 nano-technologydescription
Abstract The rheological spectra of poly(n-butyl acrylate) in the presence of a series of P(nBA-b-HEMA) rheology modifiers show a two-step relaxation process originating from the PnBA matrix and the self-assemblies. The HEMA segments are further grafted with strong, hydrogen bonding UPy groups, which both magnifies and slows down the relaxation of the assemblies. The extents of associations are enlightened by studying thermal transitions in DSC, morphological developments by SAXS, and description of rheological properties using a tube-based model. It is revealed that a weak association tendency, due to long hydrophobic blocks, leads to the formation of double-linear or star assemblies, while increasing the association strength results in the formation of micelles. In an optimum block length and UPy content, loosely entangled diblock additives can form an interconnected micellar network with significantly long relaxation time.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-04-01 | Reactive and Functional Polymers |