Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polym. Chem. & Physics of Ministry of Education, Department of Polymer Science & Engineering, College of Chemistry and Molecular Engineering, Center for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
fsdu@pku.edu.cn (F.S.D.)
zcli@pku.edu.cn (Z.C.L.)
收稿:2021-03-10,
修回:2021-4-5,
录用:2021-4-8,
网络首发:2021-05-27,
纸质出版:2021-07-18
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Lei, J. X.; Wang, Q. Y.; Du, F. S.; Li, Z. C. Dynamic ring-chain equilibrium of nucleophilic thiol-yne “click” polyaddition for recyclable poly(dithioacetal)s. Chinese J. Polym. Sci. 2021, 39, 1146–1154
Jin-Xia Lei, Qi-Yuan Wang, Fu-Sheng Du, et al. Dynamic Ring-chain Equilibrium of Nucleophilic Thiol-yne “Click” Polyaddition for Recyclable Poly(dithioacetal)s[J]. Chinese Journal of Polymer Science, 2021, 39(9): 1146-1154.
Lei, J. X.; Wang, Q. Y.; Du, F. S.; Li, Z. C. Dynamic ring-chain equilibrium of nucleophilic thiol-yne “click” polyaddition for recyclable poly(dithioacetal)s. Chinese J. Polym. Sci. 2021, 39, 1146–1154 DOI: 10.1007/s10118-021-2587-y.
Jin-Xia Lei, Qi-Yuan Wang, Fu-Sheng Du, et al. Dynamic Ring-chain Equilibrium of Nucleophilic Thiol-yne “Click” Polyaddition for Recyclable Poly(dithioacetal)s[J]. Chinese Journal of Polymer Science, 2021, 39(9): 1146-1154. DOI: 10.1007/s10118-021-2587-y.
We report a dynamic polymerization system based on the reversible nucleophilic Michael polyaddition of activated alkynes and dithiols. Four poly(dithioacetal)s (
P1
−
P4
) were prepared
via
the base-catalyzed thiol-yne “click” polyaddition of two dithiols (1
4-butanedithiol (
4S
) and 1
5-pentanedithiol (
5S
)) and two alkynones (3-butyn-2-one (
Y1
) and 1-phenyl-2-propyn-1-one (
Y2
)) at high concentrations. We systematically investigated the base-catalyzed polymerization of
4S
and
Y1
(for polymer
P1
) under different conditions
and found that this polymerization was a highly concentration-dependent dynamic system: polymer
P1
was formed at high concentration
while seven-membered dithioacetal
1-(1
3-dithiepan-2-yl) propan-2-one (
C1
)
was obtained at low concentration. The polymerization of
4S
and
Y2
(for polymer
P4
) displayed similar polymerization behavior
generating 2-(1
3-dithiepan-2-yl)-1-phenylethanone (
C4
) at low concentration. On the contrary
polymer
P2
(from
Y1
and
5S
) was exclusively obtained with no formation of eight-membered dithioacetal. The polymerizations of
Y1
with 1
2-ethanedithiol (
2S
) and 1
3-dimercaptopropane (
3S
) only afforded corresponding five- and six-membered dithioacetals
1-(1
3-dithiolan-2-yl) propan-2-one (
C2
) and 1-(1
3-dithian-2-yl) propan-2-one (
C3
). This dynamic behavior of
P1
and
P4
was attributed to the concentration-dependent retro-Michael addition reaction between a thiol and a
β
-sulfido-
α
β
-unsaturated carbonyl compound catalyzed by bases. Furthermore
polymers
P1
and
P4
could be depolymerized into
C1
and
C4
in yields of 58% and 95%
respectively. The ring-opening polymerization of
C1
at high concentration could successfully regenerate polymer
P1
. Thus
a new type of closed-loop recyclable poly(dithioacetal)s was developed.
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