Synthesis of Poly(rac-lactide) Using Tri-n-Butyltin(IV) n-Butoxide as Initiator: The Investigation on Stereochemistry and Polymerization Mechanism
Wanich Limwanich, Puttinan Meepowpan, Nawee Kungwan and Winita Punyodom* Author for corresponding; e-mail address: wanich.lim@gmail.com
Volume: Vol.45 No.5 (Special 2018)
Research Article
DOI:
Received: 1 November 2017, Revised: -, Accepted: 30 April 2018, Published: -
Citation: Limwanich W., Meepowpan P., Kungwan N. and Punyodom W., Synthesis of Poly(rac-lactide) Using Tri-n-Butyltin(IV) n-Butoxide as Initiator: The Investigation on Stereochemistry and Polymerization Mechanism , Chiang Mai Journal of Science, 2018; 45(5): 2069-2078.
Abstract
The ring-opening polymerization (ROP) of racemic-lactide (rac-LA) initiated by the synthesized tri-n-butyltin(IV) n-butoxide (nBu3SnOnBu) was investigated for first time by proton- and carbon-13 nuclear magnetic resonance spectroscopy (1H- and 13C-NMR). The polymerization of rac-LA with nBu3SnOnBu and tin(II) octoate (Sn(Oct)2) was conducted under bulk condition. The synthesized nBu3SnOnBu showed high moisture-oxygen stability and solubility in the molten rac-LA. The 13C-NMR spectra of poly(rac-LA) obtained from nBu3SnOnBu and Sn(Oct)2were slightly different indicating the different stereochemistry of synthesized polymers. The probabilities in forming of a new isotactic dyad (Pi) and the average block length of L-lactyl units (Li) in poly(rac-LA) obtained from nBu3SnOnBu was higher than Sn(Oct)2. From the results, the preferentially isotactic and heterotactic poly(rac-LA) were obtained from nBu3SnOnBu and Sn(Oct)2, respectively. The polymerization mechanism of rac-LA with the synthesized nBu3SnOnBu and Sn(Oct)2 initiating systems was proposed through the well-known coordination-insertion mechanism.