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      Controlling polymer properties through the shape of the molecular-weight distribution

      , ,
      Nature Reviews Materials
      Springer Science and Business Media LLC

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          A Theory of the Linear Viscoelastic Properties of Dilute Solutions of Coiling Polymers

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            Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores

            Zhao, Feng, Huo (1998)
            Use of amphiphilic triblock copolymers to direct the organization of polymerizing silica species has resulted in the preparation of well-ordered hexagonal mesoporous silica structures (SBA-15) with uniform pore sizes up to approximately 300 angstroms. The SBA-15 materials are synthesized in acidic media to produce highly ordered, two-dimensional hexagonal (space group p6mm) silica-block copolymer mesophases. Calcination at 500 degrees C gives porous structures with unusually large interlattice d spacings of 74.5 to 320 angstroms between the (100) planes, pore sizes from 46 to 300 angstroms, pore volume fractions up to 0.85, and silica wall thicknesses of 31 to 64 angstroms. SBA-15 can be readily prepared over a wide range of uniform pore sizes and pore wall thicknesses at low temperature (35 degrees to 80 degrees C), using a variety of poly(alkylene oxide) triblock copolymers and by the addition of cosolvent organic molecules. The block copolymer species can be recovered for reuse by solvent extraction with ethanol or removed by heating at 140 degrees C for 3 hours, in both cases, yielding a product that is thermally stable in boiling water.
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              Theory of Microphase Separation in Block Copolymers

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                Author and article information

                Contributors
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                Journal
                Nature Reviews Materials
                Nat Rev Mater
                Springer Science and Business Media LLC
                2058-8437
                December 2019
                October 01 2019
                December 2019
                : 4
                : 12
                : 761-774
                Article
                10.1038/s41578-019-0138-8
                bd8d45be-d1bb-45fe-91ab-785d132e8020
                © 2019

                http://www.springer.com/tdm

                http://www.springer.com/tdm

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