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Synthesis of High Molecular Weight Stereo-Di-Block Copolymers Driven by a Co-Initiator Free Catalyst

Abstract : Stereo-diblock copolymers of high molecular weight polylactide (PLA) were synthetized by the one pot-sequential addition method assisted by a heteroscorpionate catalyst without the need of a co-initiator. The alkyl zinc organometallic heteroscorpionate derivative (Zn(Et)(κ3-bpzteH)] (bpzteH = 2,2-bis(3,5-dimethylpyrazol-1-yl)-1-para-tolylethoxide) proved to assist in the mechanism of reaction following a coordination-insertion process. Kinetic studies along with the linear correlation between monomer and number average molecular weight (Mn) conversion, and the narrow polydispersities supported the truly living polymerization character of the initiator, whereas matrix-assisted laser desorption/Ionization-time of flight (MALDI-TOF) studies showed a very low order of transesterification. The high stereo-control attained for the afforded high molecular weight derivatives was revealed by homonuclear decoupled 1H NMR spectra and polarimetry measurements. The nanostructure of the PLA derivatives was studied by both wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC) and the stereocomplex phase of the PLA stereo-diblock copolymers was successfully identified.
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https://hal-centralesupelec.archives-ouvertes.fr/hal-03594662
Contributor : CARMEN MOYA LOPEZ-PELAEZ Connect in order to contact the contributor
Submitted on : Wednesday, March 2, 2022 - 6:05:37 PM
Last modification on : Friday, March 4, 2022 - 9:49:31 AM

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Carmen Moya Lopez-Pelaez, Carmen Moya-Lopez, Ivan Bravo, José Castro-Osma, David Chapron, et al.. Synthesis of High Molecular Weight Stereo-Di-Block Copolymers Driven by a Co-Initiator Free Catalyst. Polymers, MDPI, 2022, 14 (2), pp.232. ⟨10.3390/polym14020232⟩. ⟨hal-03594662⟩

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