Wang Xia-di,Sun Xing-yu,Luo Jing,et al.Synthesis and Microstructure Analysis of Stereoregular Poly(1,4-cyclohexadiene carbonate) Oligomers[J].ACTA POLYMERICA SINICA,2021,52(10):1316-1322.
The alternating copolymerization of carbon dioxide (CO
2
) and epoxides to prepare degradable polycarbonates is an important green polymerization process
since CO
2
is an abundant
cheap and nontoxic renewable C1 resource. Because of their good environmental friendliness and degradability
these materials are expected to be widely used in disposable packaging
degradable agricultural films
foaming agents and adhesives. For the copolymerization of substituted epoxides with CO
2
the stereochemistry inherent to the epoxide monomer provides the possibility to synthesize stereoregular polycarbonates by establishing chiral centers in the main chain of the resultant copolymers with control of the absolute configuration. Indeed
there is a great correlation between the stereochemistry of polymer main chain and its physical properties. The precise control of polymer microstructure is one of the most important goals in the field of coordination catalysis polymerization. The synthesis of the corresponding model oligomers and analysis of their
13
C-NMR spectra play a critical role in qualitative and quantitative analysis of polymer microstructure. In the present contribution
(
R
R
)/(
S
S
)-cyclohex-4-ene-1
2-diols were used as starting materials to synthesize various isotactic and syndiotactic model compounds (oligomers with 2
4
6
8 and 12 degree of polymerization) of poly(1
4-cyclohexadiene carbonate) (PCEC)
using
N
N'
-carbonyldiimidazole and triphosgene as carbonylation reagents. By comparing the signals in the
13
C-NMR spectra of various steroregular oligomers
it can be concluded that the signals at
δ
=154.04
73.83 and 29.91 are assigned to carbonyl
methine and methylene of isotactic PCEC
respectively
while the signals at
δ
=153.72
72.97 and 28.98 are attributed to carbonyl
methine and methylene of syndiotactic polycarbonate
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