Triblock copolyampholytes from 5-(N,N-dimethylamino)isoprene, styrene, and methacrylic acid: Synthesis and solution properties |
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| Authors: | R. Bieringer V. Abetz A.H.E. Müller |
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| Affiliation: | Makromolekulare Chemie II, Universit?t Bayreuth, 95440 Bayreuth, Germany, DE
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| Abstract: | 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. Received 15 March 2000 |
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| Keywords: | 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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