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Block Copolymers and Hydrophilicity

  • Atsushi Takahara

Abstract

Block copolymers are composed of more than two homopolymer components within the same molecular chain that are usually incompatible; that is, they tend to separate into microscopic domains. This phenomenon is called microphase separation.(1) The state of microphase separation depends on the molecular weight of each component, its molecular weight distribution, and the relative molecular weight ratios of the polymer components. These polymeric blocks can also be arranged in various structures as shown schematically in Fig. 1. A block copolymer that consists of two homopolymer components is called a diblock copolymer. A typical example is polystyrene (PS)—polybutadiene (PBD) (SB). A triblock copolymer has two possible configurations, such as A-B-A or A-B-C. A PS—PBD—PS (SBS) triblock copolymer is commercially available. Charge mosaic membranes can be obtained from A-B diblock, A-B-C triblock, or A-B-C-A-B pentablock copolymers. A multiblock copolymer consists of alternating oligomeric segments, segmented poly(urethanes) being well-known examples. In addition, recent macromonomer developments enable block copolymers to be prepared with graft side chains.(2)

Keywords

Contact Angle Block Copolymer Surface Free Energy Triblock Copolymer Diblock Copolymer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Atsushi Takahara
    • 1
  1. 1.Department of Chemical Science and Technology, Faculty of EngineeringKyushu UniversityHigashi-ku, Fukuoka 812Japan

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