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146. Bieringer, R.; Abetz, V.; Müller, A.H.E.: Triblock copolyampholytes from 5-(N,N-dimethylamino)isoprene, styrene, and methacrylic acid: synthesis, solution and bulk properties, European Physical Journal E 5, 5 (2001)
ABC triblock copolymers of the type poly[5-(N,N-dimethylamino)isoprene]-block-polystyrene-block-poly(tert-butyl methacrylate) (AiST) were synthesized and hydrolyzed to yield poly[5-(N,N-dimethylamino)isoprene]-block-polystyrene-block-poly(methacrylic acid) (AiSA) triblock copolyampholytes. Due to a complex solubility behavior the solution properties of these materials had to be investigated in THF/water solvent mixtures. Potentiometric titrations of AiSA triblock copolyampholytes showed two inflection points with the A block being deprotonated prior to the Ai hydrochloride block thus forming a polyzwitterion at the isoelectric point (iep). The aggregation behavior was studied by dynamic light scattering (DLS) and freeze-fracture/transmission electron microscopy (TEM). Large vesicular structures with almost pH-independent radii were observed. PACS. 61.16.Bg Transmission, reflection and scanning electron microscopy (including EBIC) - 61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling - 81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials

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