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Organocatalytic Cellulose Dissolution and In Situ Grafting of ϵ‐Caprolactone via ROP in a Reversible DBU/DMSO/CO 2 System
Author(s) -
Xu Qinqin,
Song Longchu,
Zhang Lihua,
Hu Gang,
Du Jiehao,
Liu Enhui,
Zheng Qiang,
Liu Yu,
Li Nanwen,
Xie Haibo
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701639
Subject(s) - cellulose , caprolactone , grafting , polymer chemistry , dissolution , copolymer , polymerization , reagent , ring opening polymerization , chemistry , derivatization , fourier transform infrared spectroscopy , polymer , organic chemistry , chemical engineering , high performance liquid chromatography , engineering
The facile dissolution of cellulose via its reversible reaction with CO 2 in the presence of 1, 8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) in DMSO provides a new efficient platform for derivatization of cellulose, on which serials of grafted poly‐(ϵ‐caprolactone) copolymers were successfully prepared through ring‐opening polymerization (ROP) under mild conditions without adding external catalysts. The strategy allows the preparation cellulose‐graft‐poly‐(ϵ‐caprolactone) copolymers with a molar substitution (MS PCL ) of poly‐(ϵ‐caprolactone) ranging 2.29 to 8.01 under mild conditions. The results indicated that DBU acted as not only an important reagent to achieve cellulose dissolution, but it also acted as an organocatalyst for the subsequent ROP process. The grafting content of the prepared copolymers were characterized by 1 H NMR. Their physiochemical structures were determined by NMR, FTIR, GPC and WXRD, and thermal properties were studied by TGA and DSC.