Communication Dans Un Congrès Année : 2022

Long-Chain Branched Poly(Butylene Succinate-co-Terephthalate) Copolyesters: effect of chain extension strategies on melt strength properties

Résumé

Highly-biobased poly(butylene succinate-co-terephthalate) (PBST) with processing temperatures close to commodity polymers (160 – 180°C) and long-chain branched (LCB) architectures are here prepared by various strategies. Their rheological properties are specifically investigated, in particular their melt strength behaviors. A two-step synthesis route was first proposed starting from linear PBST produced by polycondensation followed by reactive extrusion with Joncryl® at concentrations up to 2 wt-%. A one-step synthesis route was also developed using glycerol at a low concentration (0.5 wt-%) introduced directly during PBST polycondensation. For PBSTs synthesized by the two-step route, a concentration of Joncryl® close to 2 wt-% is required to significantly improve their melt strength properties with the appearance of a significant strain hardening phenomenon. However, PBSTs synthesized by a one-step route display also high melt strength properties with an outstanding strain hardening phenomenon which were attributed to an efficient branching effect of glycerol during polycondensation without any additional post-treatments by reactive extrusion. Furthermore, deeper investigations were performed by dynamic rheology and GPC. The latter showed a significant change in the distribution of molar masses of Long-Chain Branched PBSTs according to the synthesis strategy used. This work provides an effective approach to improve the melt strength of highly-biobased aliphatic-aromatic copolyesters (theoretical biobased content up to 85% for PBST) which can reduce or even eliminate extrusion defects instabilities during melt processing. This may strengthen and expand the industrial implementation of these polymers into packaging and other durable advanced applications.

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Dates et versions

hal-05040772 , version 1 (19-04-2025)

Identifiants

  • HAL Id : hal-05040772 , version 1

Citer

Tarek Dadouche, Mohamed Yousfi, Cédric Samuel, M. Lacrampe. Long-Chain Branched Poly(Butylene Succinate-co-Terephthalate) Copolyesters: effect of chain extension strategies on melt strength properties. EPF European Polymer Congress, Jun 2022, Prague, Czech Republic. ⟨hal-05040772⟩
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