New Frontiers In Polymer Synthesis (advances In Polymer Science)
by Shiro Kobayashi /
2008 / English / PDF
7 MB Download
It is generally accepted that a new material is often developed by
?nding a new synthesis method of reaction or a new reaction
catalyst. Historically, a typical example may be referred to as a
Ziegler–Natta catalyst, which has allowed large-scale production of
petroleum-based polyole?ns since the middle of the 20th century.
New polymer synthesis, therefore, will hopefully lead to creation
of new polymer materials in the 21st century. This special issue
contributed by three groups focuses on recent advances in polymer
synthesis methods, which handle the cutting-edge aspects of the
advanced technology. The ?rst article by Yokozawa and coworkers
contains an overview of the - action control in various
condensation polymerizations (polycondensations). Advanced
technologies enabled the control of stereochemistry (regio-, g-
metrical-, and enantio-selections), chemoselectivity, chain
topology, and st- chiometry of monomers, giving a high molecular
weight polymer. It has been recognized for a long time, however,
that polycondensation is a dif?cult p- cess in controlling the
reaction pathway, because the reaction is of step-growth and the
reactivity of monomers, oligomers, and polymers are almost the same
during the reaction and hence, the molecular weight of polymers and
its d- tribution (M /M ) are impossible to regulate. The authors’
group developed w n a new reaction system (chain-growth
condensation polymerization), changing the nature of
polycondensation from step-growth to chain-growth; namely the
propagating chain-end is active, allowing for control of the
product molecular weight as well as the distribution.
It is generally accepted that a new material is often developed by
?nding a new synthesis method of reaction or a new reaction
catalyst. Historically, a typical example may be referred to as a
Ziegler–Natta catalyst, which has allowed large-scale production of
petroleum-based polyole?ns since the middle of the 20th century.
New polymer synthesis, therefore, will hopefully lead to creation
of new polymer materials in the 21st century. This special issue
contributed by three groups focuses on recent advances in polymer
synthesis methods, which handle the cutting-edge aspects of the
advanced technology. The ?rst article by Yokozawa and coworkers
contains an overview of the - action control in various
condensation polymerizations (polycondensations). Advanced
technologies enabled the control of stereochemistry (regio-, g-
metrical-, and enantio-selections), chemoselectivity, chain
topology, and st- chiometry of monomers, giving a high molecular
weight polymer. It has been recognized for a long time, however,
that polycondensation is a dif?cult p- cess in controlling the
reaction pathway, because the reaction is of step-growth and the
reactivity of monomers, oligomers, and polymers are almost the same
during the reaction and hence, the molecular weight of polymers and
its d- tribution (M /M ) are impossible to regulate. The authors’
group developed w n a new reaction system (chain-growth
condensation polymerization), changing the nature of
polycondensation from step-growth to chain-growth; namely the
propagating chain-end is active, allowing for control of the
product molecular weight as well as the distribution.
