

FOLLOWUS
a.Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
b.University of Chinese Academy of Sciences, Beijing 100049, China
c.Changzhou Institute of Chemistry, Changzhou 213164, China
Gong-ying Wang, E-mail:gywang@cioc.ac.cn, wanggongying1102@126.com
Received:19 August 2016,
Revised:2016-9-5,
Accepted:11 September 2016,
Published:2017-01
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Zi-qing Wang, Yuan-sheng Bai, Wei Jiang, et al. Structure-Activity Correlations of Calcined Mg-Al Hydrocalcites for Aliphatic Polycarbonate Synthesis
Mg-Al mixed oxides with different Mg/Al molar ratio were prepared by thermal decomposition of hydrotalcite-like precursors at 500℃ for 5.0 h and used as catalysts for the transesterification of diphenyl carbonate with 1
4-butanediol to synthesize high-molecular-weight poly(butylene carbonate) (PBC). The structure-activity correlations of these catalysts in this transesterification process were discussed by means of various characterization techniques. It was found that the chain growth for the formation of PBC can only be obtained through connecting-OH and-OC(C) OC
6
H
5
end-group upon removing the generated phenol
and the sample with Mg/Al molar ratio of 4.0 exhibited the best catalytic performance
giving PBC with
M
w
of 1.64×10
5
g/mol at 210℃ for 3.0 h. This excellent activity depended mainly on the specific surface area and basicity rather than pore structure or crystallite size of MgO.
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