Synthesis of poly(lactic acid)–poly(ethylene glycol) copolymers using multi-SO3H-functionalized ionic liquid as the efficient and reusable catalyst

Poly(lactic acid)–poly(ethylene glycol) copolymers were synthesized under the catalysis of multi-SO 3 H-functionalized ionic liquid. Compared to the ordinary ionic liquids and the traditional Lewis acid catalysts, the ionic liquids with multi-sulfonic acid groups were more catalytically active, and...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2014-05, Vol.71 (5), p.1173-1195
Main Authors: Ren, Hui-xue, Ying, Han-jie, Sun, You-min, Wu, Dao-ji, Ma, Yong-shan, Wei, Xiao-feng
Format: Article
Language:English
Subjects:
Applied sciences
Catalysis
Catalysts
Catalytic activity
Caustic soda
Characterization and Evaluation of Materials
Chemical synthesis
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Contact angle
Copolymerization
Copolymers
Degree of crystallinity
Efficiency
Exact sciences and technology
Ionic liquids
Lewis acid
Mechanical properties
Molecular weight
Organic Chemistry
Organic polymers
Original Paper
Physical Chemistry
Physicochemistry of polymers
Polycondensation
Polyethylene glycol
Polylactic acid
Polymer Sciences
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Reaction kinetics
Soft and Granular Matter
Sulfonic acid
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Summary:Poly(lactic acid)–poly(ethylene glycol) copolymers were synthesized under the catalysis of multi-SO 3 H-functionalized ionic liquid. Compared to the ordinary ionic liquids and the traditional Lewis acid catalysts, the ionic liquids with multi-sulfonic acid groups were more catalytically active, and the reaction conversion rate reached up to 97.8 %. The molecular weight of the resulting copolymer was 5.69 × 10 4  g mol −1 and the degree of crystallinity was 42.9 %. The copolymers were also of higher hydrophilicity and better mechanical properties. The reaction kinetics of copolymerization was analyzed. The intrinsically high catalytic activity of multi-SO 3 H groups originated from the lower activation energy and the higher free acidity. The recovering catalytic activity of the multi-SO 3 H ionic liquid catalyst was higher, suggesting that it is a recyclable, environmentally friendly catalyst.
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-014-1117-2