2 research outputs found
Efficient Amine End-Functionalization of Living Ring-Opening Metathesis Polymers
An efficient strategy for the synthesis of monoamine
end-functionalized living polymers using ring-opening metathesis polymerization
with ruthenium initiators is reported. A new end-capping agent for
this purpose was synthesized, and its efficiency for end-functionalization
was evaluated using two common ruthenium-based initiators. Finally,
terminal cross-metathesis was also explored as another alternative
toward the synthesis of amine end-functionalized polymers, and the
comparison between the two techniques is presented
Magnetic Levitation To Characterize the Kinetics of Free-Radical Polymerization
This
work describes the development of magnetic levitation (MagLev)
to characterize the kinetics of free-radical polymerization of water-insoluble,
low-molecular-weight monomers that show a large change in density
upon polymerization. Maglev measures density, and certain classes
of monomers show a large change in density when monomers covalently
join in polymer chains. MagLev characterized both the thermal polymerization
of methacrylate-based monomers and the photopolymerization of methyl
methacrylate and made it possible to determine the orders of reaction
and the Arrhenius activation energy of polymerization. MagLev also
made it possible to monitor polymerization in the presence of solids
(aramid fibers, and carbon fibers, and glass fibers). MagLev offers
a new analytical technique to materials and polymer scientists that
complements other methods (even those based on density, such as dilatometry),
and will be useful in investigating polymerizations, evaluating inhibition
of polymerizations, and studying polymerization in the presence of
included solid materials (e.g., for composite materials)