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Block copolymer materials from the organocatalytic ring-opening polymerization of a pentaerythritol-derived cyclic carbonate
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Brannigan, Ruairi, Walder, Anthony and Dove, Andrew P. (2014) Block copolymer materials from the organocatalytic ring-opening polymerization of a pentaerythritol-derived cyclic carbonate. Journal of Polymer Science Part A: Polymer Chemistry, Volume 52 (Number 16). pp. 2279-2286. doi:10.1002/pola.27246 ISSN 0887-624X.
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Official URL: http://dx.doi.org/10.1002/pola.27246
Abstract
9-Phenyl-2,4,8,10-tetraoxaspiro[5,5]undecanone (PTO) was synthesized from pentaerythritol via the acid-catalyzed acetal formation reaction with benzaldehyde and subsequent ring closure with ethyl chloroformate. The cyclic carbonate monomer was subsequently polymerized by ring-opening polymerization (ROP) initiated from 1,4-butanediol (1,4-BDO) using the 1-(3,5-bis(trifluoromethyl)phenyl)-3-cyclohexylthiourea and 1,8-diazabicyclo[5.4.0]undec-7-ene dual organocatalytic system. It was found that the organocatalyst allowed for the synthesis of well-defined polymers with minimal adverse side reactions and low dispersities. This system was then employed in the ROP of PTO initiated from an α,ω-dihydroxy poly(caprolactone) (PCL) macroinitiator, with varying molecular weights, to yield a series of A-B-A block copolymers. These materials were characterized by 1H NMR spectroscopy, gel permeation chromatography, differential scanning calorimetry, thermogravimetric analysis and tensile analysis. It was found that the chain extension from PCL with poly(PTO) (PPTO) blocks yielded a thermoplastic material with superior tensile properties (elongation and Young's modulus) to that of the PCL homopolymer. Furthermore, it was noted that the addition of PPTO could be employed to alter the crystallization properties (crystallization temperature (Tc), and percentage crystallization) of the central PCL block. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 2279–2286
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||
| Journal or Publication Title: | Journal of Polymer Science Part A: Polymer Chemistry | ||||||||
| Publisher: | John Wiley & Sons Ltd. | ||||||||
| ISSN: | 0887-624X | ||||||||
| Official Date: | 4 July 2014 | ||||||||
| Dates: |
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| Volume: | Volume 52 | ||||||||
| Number: | Number 16 | ||||||||
| Page Range: | pp. 2279-2286 | ||||||||
| DOI: | 10.1002/pola.27246 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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