Burkhardt Markus, Martinez-Castro Nemesio, Tea Sandrine, Drechsler Markus, Babin Ivan, Grishagin Ivan, Schweins Ralf, Pergushov Dmitry V, Gradzielski Michael, Zezin Alexander B, Müller Axel H E
Makromolekulare Chemie II, Universität Bayreuth, D-95440 Bayreuth, Germany.
Langmuir. 2007 Dec 18;23(26):12864-74. doi: 10.1021/la701807b. Epub 2007 Nov 15.
Ionic amphiphilic diblock copolymer polyisobutylene-block-poly(methacrylic acid) (PIBx-b-PMAAy), with various lengths of nonpolar (x=25-75) and polyelectrolyte (y=170-2600) blocks, spontaneously dissolve in aqueous media at pH>4, generating macromolecular assemblies, the aggregation number of which depends on external stimuli (pH and ionic strength). Spherical micellar morphology with a compact core formed by the PIB blocks and a swollen corona built up from the PMAA blocks was deduced by cryogenic transmission electron microscopy. The micelles were further characterized by means of dynamic and static light scattering as well as small-angle neutron scattering. The critical micellization concentration, estimated by means of fluorescence spectroscopy with the use of pyrene as a polarity probe, is decisively determined by the length of the PIB block and is insensitive to changes in the length of the PMAA block.
离子型两亲性二嵌段共聚物聚异丁烯-嵌段-聚（甲基丙烯酸）（PIBx-b-PMAAy），具有不同长度的非极性链段（x = 25 - 75）和聚电解质链段（y = 170 - 2600），在pH>4的水性介质中自发溶解，形成大分子聚集体，其聚集数取决于外部刺激（pH和离子强度）。通过低温透射电子显微镜推断出具有由PIB链段形成的致密核和由PMAA链段构成的肿胀冠层的球形胶束形态。通过动态和静态光散射以及小角中子散射对胶束进行了进一步表征。使用芘作为极性探针通过荧光光谱法估算的临界胶束浓度，主要由PIB链段的长度决定，对PMAA链段长度的变化不敏感。
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