Synthesis and characterization of polylactide functionalized polyacetylenes |
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Authors: | Izabela Czelu?niak Teresa Szymańska-Buzar |
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Institution: | Faculty of Chemistry, Wroc?aw University, ul. F. Joliot-Curie 14, 50-383 Wroc?aw, Poland |
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Abstract: | The paper deals with the synthesis and polymerization of novel poly(l-lactide)-derived acetylene monomers and the analysis of the thermal properties of the formed graft copolymers. Poly(l-lactide) macromonomers with different acetylene end groups were prepared using stannous octanoate as a catalyst in the presence of various hydroxyacetylenes. Next, the well-characterized macromonomers were subjected to polymerization using {RhCl(nbd)}2]/Et3N and RuCl2(CH–o–OiPrC6H4)(IMesH2)] to obtain graft copolymers. Investigation of these graft copolymers by GPC and NMR spectroscopy revealed the presence of some poly(l-lactide) formed as a side product during the ring opening polymerization of l-lactide. The thermal stability of the polymeric materials has been studied as a function of the polyacetylene backbone substituents and the length of poly(l-lactide) side chains. Introducing polyacetylene into polyester increased the polymer stability. The thermal degradation behavior of the synthesized materials depends on the length of poly(l-lactide) chains and also on l-lactide homopolymer impurities in the graft copolymers. |
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Keywords: | Polyacetylene Polylactide Polymerization ROP Ruthenium catalyst Rhodium initiator |
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