Premium
Emulsification of poly(ethylene glycol) in thermoplastic elastomers by using polybutadiene‐ block ‐poly(ethylene oxide) diblock copolymers as stabilisers. Determination of the liquid phase mobility by pulsed field gradient NMR
Author(s) -
Hoerner Pierre,
Riess Gérard,
Rittig Frank,
Fleischer Gerald
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980301)199:3<343::aid-macp343>3.0.co;2-j
Subject(s) - polybutadiene , copolymer , materials science , ethylene glycol , polymer chemistry , elastomer , thermoplastic elastomer , chemical engineering , micelle , ethylene oxide , phase (matter) , polymer , composite material , chemistry , organic chemistry , engineering , aqueous solution
Polymeric film materials comprising a continuous elastomer phase of a styrene‐hydrogenated diene thermoplastic elastomer (SEBS) and a dispersed liquid phase of poly(ethylene glycol) (PEG) were prepared by starting from an emulsion of PEG dispersed as small droplets in a solution of SEBS in methylcyclohexane. A polybutadiene‐ block ‐poly(ethylene oxide) block copolymer is used as emulsifier and stabiliser for these emulsions. The particle size of the dispersed PEG phase, in the emulsion, and in the final film obtained by solvent evaporation could be adjusted as a function of the block copolymer concentration. The morphology of the material was studied by scanning electron microscopy (SEM) and pulsed field gradient (PFG) NMR. From the diffusion coefficients determined by PFG NMR it is demonstrated that a part of the block copolymer, in addition to its stabilisation effect, has a tendency to form in the rubber matrix micelles and aggregates (polymolecular micelles) which are able to “solubilize” a given fraction of PEG.