Novel Tailor made Multiblock Polyesters/Polycarbonates Biomaterials via Organometallic Polymerization Synthesis

Bolley A

doi:10.37871/jbres1260

Bolley A

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Since 1940, mass production of polyolefin plastics produced annually has increased rapidly [1]. The most common plastics, which account for approximately 80% of the European plastic demand, are: Polyethylene (PE), Polypropylene (PP), Poly (Vinyl Chloride) (PVC) and Polystyrene (PS) (Figure 1) [2]. Therefore, plastic materials have experienced a substantial expansion, and are the most used materials nowadays. These materials have a wide range of application from packaging to electronic devices [3].

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Since 1940, mass production of polyolefin plastics produced annually has increased rapidly [1]
The synthesis of N-Heterocyclic Carbene (NHC), [NHC =1,3-bis(2,4,6trimethylphenyl)imidazole-2-ylidene (IMes), with group XIII trimethylmetals lead to different catalysts of the type (NHC)M’R3 [7] and another reaction between IMesAlMe3 adduct with a stoichiometric amount of B(C6F5)3 in presence of an external base (Et2O) produces a stable cationic alkyl (IMes)AlMe2Et2O [8]
These four compounds act as efficient Ring Opening Polymerization (ROP) initiators of rac-lactide and allow an access to linear or cyclic Poly(Lactic Acid) (PLA) depending on the nature of the initiator and the

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Introduction

Since 1940, mass production of polyolefin plastics produced annually has increased rapidly [1]. Over the past two decades, the production of biodegradable polyesters has a considerable attention, for example, polylactide derived from Ring Opening Polymerization (ROP) of lactide (dimer of lactic acid, a renewable resource available from starch) and already used for several applications (packaging, biomedical, building and construction, automotive) [5]. The synthesis of N-Heterocyclic Carbene (NHC), [NHC =1 ,3-bis(2,4,6trimethylphenyl)imidazole-2-ylidene (IMes), with group XIII trimethylmetals lead to different catalysts of the type (NHC)M’R3 [7] and another reaction between IMesAlMe3 adduct with a stoichiometric amount of B(C6F5)3 in presence of an external base (Et2O) produces a stable cationic alkyl (IMes)AlMe2Et2O [8].

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