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- W2034015013 abstract "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<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>C</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mtext>v</mml:mtext></mml:mrow></mml:msub></mml:mrow></mml:math>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." @default.
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- W2034015013 date "2010-01-01" @default.
- W2034015013 modified "2023-10-15" @default.
- W2034015013 title "Ring-Opening Polymerisation of<i>rac</i>-Lactide Using a Calix[4]arene-Based Titanium (IV) Complex" @default.
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- W2034015013 doi "https://doi.org/10.1155/2010/490724" @default.
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