Synthesis And Characterization Of Ionically Bonded Diblock Copolymers
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Synthesis And Characterization Of Ionically Bonded Diblock Copolymers
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Author : Lei Feng (Chemical engineer)
language : en
Publisher:
Release Date : 2013
Synthesis And Characterization Of Ionically Bonded Diblock Copolymers written by Lei Feng (Chemical engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Diblock copolymers categories.
Block copolymers consist of two or more incompatible polymer chains linked by covalent bonds. These block copolymer can separate into nanometer sized domains whose morphology depends upon the size of the block and interactions between them. The properties of block copolymers can be modified and potentially improved by introducing noncovalent interactions to replace covalent linkages between blocks to form supramolecular block copolymers. These kinds of materials combine the microphase separation inherent to block copolymers with the facile synthesis of supramolecular materials thereby affording new and unique materials. This dissertation focuses on synthesis and characterization of PS-b-PMA block copolymers with ion-pair junctions.Firstly, the chain-end sulfonated polystyrene ([omega]-sulfonated PS) was synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization and postpolymerization modification. In the postpolymerization modification two methods were investigated: in the first one, the polymer was converted to a thiol-terminated polymer by aminolysis. Then a sulfonic acid end-group was produced then by oxidation of the thiol end-group with m-chloroperoxybenzoicacid (m-CPBA); in the second method, the RAFT-polymerized polymer was directly sulfonated by oxidation with m-CPBA. After purification by column chromatography, [omega]-sulfonated PS was obtained by both methods with greater than 95% end-group functionality as measured by titration. The sulfonic acid end-group could be neutralized with various ammonium or imidazolium counter ions through acid-base or ionic metathesis reactions. These polymers with ionic end-group can be used as model supramolecular building blocks.Secondly, ammonium end functionalized polymethylacrylate (PMA) was synthesized directly by RAFT polymerization using functional RAFT agent. Then chain-end sulfonated polystyrene and ammonium end functionalized polymethylacrylate (PMA) were used to synthesize A-B block copolymers by two different methods: the first method was by mixing two oppositely charged end group functionalized polymers; the second method was to ionically bond a RAFT agent to the chain end of an end sulfonated polymer to generate a supramolecular macro RAFT agent then an A-B block copolymer was prepared by RAFT polymerization using supramolecular macro-RAFT agent. The polymerization kinetics were investigated and the molecular weight and the chemical structure of the block copolymers were characterized by 1H-NMR and SEC. The results show that the ion-bonded supramolecular block copolymer, PS-PMA, have been successfully prepared with controlled molecular weight and narrow distribution.Thirdly, the morphology of the ion-bonded supramolecular PS-PMA diblock copolymers were investigated by small-angle X-ray scattering (SAXS) and rheological techniques. Several covalently bonded PS-PMA block copolymers were synthesized by RAFT polymerization and their micro domain structures and rheology behaviors were also investigated. The results showed that the electrostatic interactions between the end ion groups are able to overcome the thermodynamic repulsion of two blocks result in the formation of diblock copolymers with similar behaviors and morphology of traditional covalent bonded diblock copolymers and their micro domain structures remain to high temperatures.
Synthesis And Characterization Of Functional Diblock Copolymers
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Author : Sachin Borkar
language : en
Publisher:
Release Date : 2003
Synthesis And Characterization Of Functional Diblock Copolymers written by Sachin Borkar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Synthesis And Characterization Of Self Assembled Diblock Copolymers Containing Azo Pendant Groups
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Author : 安家幸
language : en
Publisher:
Release Date : 2008
Synthesis And Characterization Of Self Assembled Diblock Copolymers Containing Azo Pendant Groups written by 安家幸 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Molecular Design Synthesis Characterization And Processing Of Liquid Crystalline Diblock Copolymers
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Author : Guoping Mao
language : en
Publisher:
Release Date : 1997
Molecular Design Synthesis Characterization And Processing Of Liquid Crystalline Diblock Copolymers written by Guoping Mao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Synthesis And Characterization Of Novel Random Diblock Copolymers
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Author : Arman Ashraf
language : en
Publisher:
Release Date : 1997
Synthesis And Characterization Of Novel Random Diblock Copolymers written by Arman Ashraf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Synthesis And Characterization Of Neutral Ionic Block Copolymers Of Various Architectures
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Author : Jin Chuan Yang
language : en
Publisher:
Release Date : 2001
Synthesis And Characterization Of Neutral Ionic Block Copolymers Of Various Architectures written by Jin Chuan Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Block copolymers categories.
Synthesis And Characterization Of Polystyrene Polysiloxane Side Chain Liquid Crystalline Diblock Copolymers
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Author : Aaron J. Moment
language : en
Publisher:
Release Date : 1998
Synthesis And Characterization Of Polystyrene Polysiloxane Side Chain Liquid Crystalline Diblock Copolymers written by Aaron J. Moment and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Chemical engineering categories.
Synthesis Characterization And Manipulation Of Diblock Copolymers And Their Resulting Organic Inorganic Hybrid Materials At Surfaces And Interfaces
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Author : Diane T. Babski
language : en
Publisher:
Release Date : 2002
Synthesis Characterization And Manipulation Of Diblock Copolymers And Their Resulting Organic Inorganic Hybrid Materials At Surfaces And Interfaces written by Diane T. Babski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
The Synthesis And Characterization Of Conformationally Asymmetric Diblock Copolymers
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Author : Jennifer L. David
language : en
Publisher:
Release Date : 1999
The Synthesis And Characterization Of Conformationally Asymmetric Diblock Copolymers written by Jennifer L. David and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Asymmetric synthesis categories.
Synthesis And Characterization Of Polystyrene Polysiloxane Diblock Copolymers
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Author : Craig Everett Selby
language : en
Publisher:
Release Date : 1995
Synthesis And Characterization Of Polystyrene Polysiloxane Diblock Copolymers written by Craig Everett Selby and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.