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Article Dans Une Revue Chemistry - A European Journal Année : 2012

Synthesis and Characterization of a Thermoresponsive Polyoxometalate-Polymer Hybrid

Jennifer Lesage de La Haye
  • Fonction : Auteur
Iban Azcarate
  • Fonction : Auteur
Emmanuel Lacôte
Jutta Rieger
Tarek Antoun
  • Fonction : Auteur
Soo-Hyon Lee
  • Fonction : Auteur
Marion Chenal
  • Fonction : Auteur

Résumé

We report the synthesis of the first organo-POM with thermoresponsive properties. Our concept will provide chemists with a new tool to design POMs whose solubility is reversibly controllable through an external stimulus. POMpolymer TBA7[POM]-poly(N,N-diethylacrylamide) (POMPDEAAm), was prepared by grafting PDEAAm-NH2 (obtained by RAFT polymerization) onto the activated Dawson acyl-POM, a2-[P2W17O61SnCH2CH2C(?O)]6-. Extensive MS analysis was used to monitor the chain-functionalization steps and to confirm the formation of the hybrid. Aqueous solutions of the (NH4)7[POMPDEAAm] exhibited a LCST of 38 degrees C. Thus, the solubility/aggregation of the hybrid was reversibly controlled by changing the temperature. Above 38 degrees C, the solution became cloudy, and cleared again upon cooling. Dynamic light scattering (DLS) revealed the formation of small aggregates in the range 100 nm. We assumed that the charged POM head units prevented the formation of the larger-scattering aggregates that are usually observed for PDEAAm, and promoted the formation of micelle-like structures. The conjugate exhibited a temperature transition, which was different from that of the polymer and depended on the counterions associated with the POM. This result demonstrates the potential for merging organic (in this case, polymer) and inorganic structures to afford materials that exhibit new properties.

Dates et versions

hal-01397624 , version 1 (16-11-2016)

Identifiants

Citer

Gaelle Pembouong, Jennifer Lesage de La Haye, Iban Azcarate, Bernold Hasenknopf, Emmanuel Lacôte, et al.. Synthesis and Characterization of a Thermoresponsive Polyoxometalate-Polymer Hybrid. Chemistry - A European Journal, 2012, 18 (11), pp.3355-3361. ⟨10.1002/chem.201101771⟩. ⟨hal-01397624⟩
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