Human ability to discriminate between hydrophilic and hydrophobic surfaces is attributed to differences in vibrational frequencies generated while sliding at particular velocities and normal forces.
Macromonomers
bearing a functional group exclusively at one end
are often synthesized by terminating a living polymerization with
a suitable agent, at the cost of one initiator molecule per chain.
An attractive alternative is to use chain transfer to install the
functional endgroup. Herein, polycyclopentene (PCP) bearing a single
styryl endgroup is synthesized by ring-opening metathesis polymerization
with a well-defined Mo-based (Schrock) initiator, by employing divinylbenzene
as a chain-transfer agent. High regioselectivity of the chain-transfer
step, with minimal secondary metathesis of double bonds in the PCP
backbone, is confirmed by mass spectral endgroup analysis. A styryl-functional
PCP macromonomer copolymerizes effectively with styrene in a free-radical
process (styrene reactivity ratio r
S ≈
1.7), producing a comb copolymer with a polystyrene backbone and PCP
“teeth”.
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