Galina S. Bozhenkova, Roman V. Ashirov, Alexey A. Lyapkov, Stanislav A. Kiselev, Mekhman S. Yusubov and Francis Verpoort Pages 383 - 388 ( 6 )
Background: Ring Opening Metathesis Polymerization (ROMP) can provide a wide range of possibilities for polymers and copolymers synthesis. Norbornene and its derivatives can serve as monomers for the synthesis of highly molecular mass polymers with widely varying structure.Objective: In this paper a new polymers based on dimethyl ether norbornenedicarboxylic acids were prepared by ring-opening metathesis polymerization in the presence of a catalyst of Hoveyda-Grubbs II. Method: The resulting polymers and monomers were characterized by NMR, IR, GCMS, TGA, DSC. Results: Chemical yield of investigated processes was more than 95 %, molecular mass of the obtained polymers was also relatively high (more than 4.5•106 g/mol). The research findings have shown that polymers obtained with bi- and tri-functional comonomers are more heat resistant and are stable up to the 370 °C. Also it was shown that the addition of bi-and tri-functional comonomers facilitates the significant improving of mechanical and physical properties. Polymer obtained with 3 wt.% of tri-functional comonomer possesses the biggest values of modulus of elasticity in flexure, breaking elongation and breaking strength. Conclusion: New polymers based of exo,exo and endo,endo-dimethyl esters of 5-norbornen-2,3-dicarbonic acid (DME) with addition of bi-functional and tri-functional comonomers were synthesized via metathesis polymerization. The addition of 3 wt.% of bi-functional and tri-functional comonomers resulted in polymers having a higher crosslinking degree and glass transition temperature. The synthesized polymers demonstrated a higher application temperature and better mechanical and physical properties than poly-DME.
Ring Opening Metathesis Polymerization (ROMP), bi- and tri-functional comonomers, cross-linking agent, norbornene derivatives.
National Research Tomsk Polytechnic University, Tomsk, National Research Tomsk Polytechnic University, Tomsk, National Research Tomsk Polytechnic University, Tomsk, National Research Tomsk State University, Tomsk, Department of Technology Organic Substances and Polymer Materials, Institute of Natural Resources, National Tomsk Polytechnic University, P.O. Box: 634-050, Tomsk, Department of Inorganic and Physical Chemistry, Gent University, Gent