

FOLLOWUS
a.Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
cyhu@ciac.ac.cn (C.Y.H.)
xpang@ciac.ac.cn (X.P.)
Received:07 July 2023,
Revised:2023-7-27,
Accepted:27 July 2023,
Online First:15 November 2023,
Published:01 February 2024
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Ren, F.; Liang, Z. Z.; Niu, M. X.; Hu, C. Y.; Pang, X. Preparation of chemically recyclable poly(ether-alt-ester) by the ring opening polymerization of cyclic monomers synthesized by coupling glycolide and epoxides. Chinese J. Polym. Sci. 2024, 42, 168–175
Feng Ren, Zhuang-Zhuang Liang, Ming-Xin Niu, et al. Preparation of Chemically Recyclable Poly(ether-
Ren, F.; Liang, Z. Z.; Niu, M. X.; Hu, C. Y.; Pang, X. Preparation of chemically recyclable poly(ether-alt-ester) by the ring opening polymerization of cyclic monomers synthesized by coupling glycolide and epoxides. Chinese J. Polym. Sci. 2024, 42, 168–175 DOI: 10.1007/s10118-023-3040-1.
Feng Ren, Zhuang-Zhuang Liang, Ming-Xin Niu, et al. Preparation of Chemically Recyclable Poly(ether-
Here
we reported that 1
4-dioxan-2-one with different substituents was successfully synthesized by coupling glycolide with epoxide using Salen-Cr(Ⅲ)/PPNCl as catalyst. The monomers underwent ROP to form poly(ester-alt-ether)s with alternating glycolic acid and epoxides using thiourea/base. The poly(ester-alt-ether)s showed low
T
g
and chemical recyclability to monomers in the presence of catalysts.
Polyester and polyether are two key oxygenated polymers
and completely alternative sequence of poly(ester-
alt
-ether) could efficiently combine the advantages (including flexibility
degradability
etc
.) of both segments. Currently
despite their copolymers could be synthesized from one-pot mixture of cyclic esters and epoxides
perfectly alternative microstructure is very challenging to realize and typically restricted to certain monomer pairs. Moving forward
synthesizing poly(ester-
alt
-ether) from commercially available and largescale monomers would be a significant advance. For example
successfully commercialized poly(glycolic acid) (PGA)
which is not easily soluble in polymers due to its high crystallinity and is brittle and difficult to control the degradation cycle
would encounter a new paradigm if engineered into poly(ester-
alt
-ether). In this work
starting from the design of monomer with hybrid structures
we successfully synthesized a series of 1
4-dioxan-2-one containing different substituents based on glycolide (GA) and epoxides using commercially available Salen-Cr(III) and PPNCl catalytic systems. The new monomers underwent ring-opening polymerization (ROP) to form a series of poly(ester
-alt-
ether) with perfectly alternating glycolic acid and propylene glycol repeat units under catalytic system of thiourea/base. The poly(ester-
alt
-ether) have significantly lower glass-transition temperature than PGA. Additionally
the poly(ester-
alt
-ether) can be chemically recovered to monomer using Sn(Oct)
2
or 1
8-diazabicyclo[5.4.0]undecane-7-ene (DBU) as a catalyst in solution
thus establishing a closed-loop life cycle. From monomers derived from GA and epoxides
this work furnishes a novel strategy for the synthesis of poly(ester-
alt
-ether) with chemical recyclability.
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