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A highly active and site selective indium catalyst for lactide polymerization.

Dinesh C Aluthge1, Brian O Patrick, Parisa Mehrkhodavandi

  • 1University of British Columbia, Department of Chemistry, 2036 Main Mall, Vancouver, B.C., Canada.

Chemical Communications (Cambridge, England)
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

Chiral indium salen catalysts efficiently polymerize lactide with high selectivity. This controlled process yields high molecular weight polymers and reveals enantiomorphic site control is key to catalyst performance.

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Area of Science:

  • Polymer Chemistry
  • Organometallic Catalysis
  • Stereoselective Synthesis

Background:

  • Ring-opening polymerization (ROP) of lactide is crucial for producing biodegradable polymers.
  • Developing highly active and selective catalysts for lactide ROP remains a significant challenge.
  • Chiral catalysts are essential for controlling polymer stereochemistry and properties.

Purpose of the Study:

  • To investigate the efficacy of chiral indium salen complexes as catalysts for lactide ROP.
  • To achieve high activity and isoselectivity in the polymerization of racemic lactide.
  • To elucidate the mechanism of stereocontrol in these catalytic systems.

Main Methods:

  • Synthesis and characterization of chiral indium salen complexes.
  • Ring-opening polymerization of racemic lactide using the developed catalysts.
  • Analysis of polymer molecular weights and molecular weight distributions (MWD).
  • Kinetic studies using enantiopure catalysts to determine the mechanism of selectivity.

Main Results:

  • Chiral indium salen complexes demonstrated high activity and isoselectivity in the ROP of racemic lactide.
  • The polymerizations were well-controlled, affording polymers with high molecular weights.
  • Low molecular weight distributions were achieved, indicating controlled polymerization.
  • Preliminary kinetic data confirmed enantiomorphic site control as the primary factor influencing selectivity.
  • Evidence for the formation of block copolymers was observed.

Conclusions:

  • Chiral indium salen complexes are highly effective catalysts for stereoselective lactide polymerization.
  • The catalytic system offers excellent control over polymer molecular weight and MWD.
  • Enantiomorphic site control is the dominant mechanism governing the observed selectivity.
  • This work provides a foundation for designing advanced catalysts for stereocontrolled polymer synthesis.