- Biochemistry and Genetics by Golder N. WillsonPreTest Self-Assesment and Review biochip patent analysis Critical Factors for Successful PCR DNA Condensation The Chemistry of HeterocyclesThe Chemistry ...
Biochemistry and Genetics by Golder N. Willson
PreTest Self-Assesment and Review
biochip patent analysis
Critical Factors for Successful PCR
DNA Condensation
The Chemistry of Heterocycles
The Chemistry of Heterocycles: Structure, Reactions, Syntheses, and Applications, 2nd, Completely Revised, and Enlarged Edition
The Chemistry of Heterocycles: Structure, Reactions, Syntheses, and Applications, 2nd, Completely Revised, and Enlarged Edition
Theophil Eicher, Siegfried Hauptmann
ISBN: 3-527-30720-6
Paperback
572 pages
July 2003
The second edition of this "classic" among textbooks on heterocycle chemistry. Here, Theophil Eicher and Siegfried Hauptmann, both renowned authors of many successful such works, present all the important aspects of this fascinating field in a clear manner.
- completely revised
- enlarged
- numerous Q&As help readers to deepen their knowledge
- covers the very latest topics, such as metal-catalyzed coupling reactions
- systematic substance nomenclature
- comprehensive overview of all the important substance classes.
BLOCK COPOLYMERS BY ANIONIC POLYMERIZATION
Anionic living polymerization has been known for almost fifty years. Since
its discovery in the 1950s, it has emerged as the most powerful synthetic tool for the preparation of well-defined polymers, i.e., narrow molecular weight distribution polymers with controlled molecular characteristics including molecular weight, composition, microstructure, and architecture. Its ability to form well-defined macromolecules is mainly due to the absence of termination and chain transfer reactions, under appropriate conditions (Young 1984, Hsieh 1996).
BLOCK COPOLYMERS BY CATIONIC POLYMERIZATION
BLOCK COPOLYMERS BY CATIONIC POLYMERIZATION
Advances in cationic polymerization methodology, starting in the middle 80s with
the discovery of the true living cationic polymerization of vinyl ethers by
Higashimura et al. (Miyamoto 1984), have shown their real potential for the
synthesis of tailor-made macromolecules. In recent years many investigations have demonstrated that almost all classes of cationically polymerizable vinyl and alkene-type monomers can be polymerized in a controllable way (Faust 1997, Matyjaszewski 1996, Sawamoto 1991). The formation of polymers having predictable molecular weight and narrow molecular weight distributions gives unambiguous experimental evidence for elimination or suppression of termination and chain transfer reactions in these systems. These studies opened the way for block copolymer synthesis using cationically polymerizable monomers, extending
the range of block copolymers available for basic research and for possible
technological applications. Many important monomers like isobutylene and alkyl vinyl ether can be polymerized only by cationic polymerization.
BLOCK COPOLYMERS BY LIVING FREE RADICAL POLYMERIZATION
Free radical polymerization is the oldest mechanism for polymerization of vinyl
monomers (Odian 1981). This kind of polymerization is widely used for the
industrial preparation of a large number of polymeric materials (e.g., LDPE,
PVC, etc.). A large range of monomers can be polymerized and copolymerized
by free radical polymerization, under less rigorous experimental conditions compared
with ionic polymerizations. Free radical polymerization processes are
tolerant of protic and aqueous solvent media and certain functional monomers.
However, the disadvantage of the free radical mechanism is the preparation of
polydisperse polymers with little control over their molecular characteristics due to
automatic termination and chain transfer reactions.
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