Ring-Opening Polymerisation ofrac-Lactide Using a Calix[4]arene-Based Titanium (IV) Complex | Zendy

Marco Frediani | Zendy; David Sémeril | Zendy; Dominique Matt | Zendy; Luca Rosi | Zendy; Piero Frediani | Zendy; Fabio Rizzolo | Zendy; Anna Maria Papini | Zendy

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Ring-Opening Polymerisation ofrac-Lactide Using a Calix[4]arene-Based Titanium (IV) Complex

Author(s) -

Marco Frediani,

David Sémeril,

Dominique Matt,

Luca Rosi,

Piero Frediani,

Fabio Rizzolo,

Anna Maria Papini

Publication year - 2010

Publication title -

international journal of polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.399

H-Index - 33

eISSN - 1687-9430

pISSN - 1687-9422

DOI - 10.1155/2010/490724

Subject(s) - materials science , polymerization , monomer , ring opening polymerization , tacticity , polymer , polymer chemistry , molar mass distribution , calixarene , titanium , lactide , molecule , chemistry , composite material , organic chemistry , metallurgy

cone-25,27-Dipropyloxy-26,28-dioxo-calix[4]arene titanium (IV) dichloride (1) has been assessed in the ring-opening polymerisation of rac-lactide (L,D-LA). The polymers formed (PLDA) turned out to display an isotactic stereoblock microstructure (determined by NMR) despite the fact that the catalyst has C2v symmetry. Two techniques were applied for initiating the polymerisation reaction, microwave irradiation, and conventional thermal treatment. The polymers obtained were all characterised by NMR, IR, HPLC-SEC, DSC, and MALDI-TOF analysis. The use of microwave irradiation, applied for the first time to calixarene-based catalysts in the presence of the rac-lactide monomer, increased the polymerisation rate compared with that obtained by the other method. On the other hand, standard thermal treatment enabled a slightly better control than microwave irradiation over the molecular weight and molecular weight distribution of the polylactides formed

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