Synteza i ocena właściwości multimetakrylanów pochodnych kwasu maleopimarowego

Przedstawiono syntezę oraz właściwości fizyczne, termiczne i mechaniczne kopolimerów multimetakrylanów. Kopolimery te otrzymano z adduktu metakrylanu glicydylu i kwasu fumaropimarowego oraz metakrylanu metylu i/lub styrenu. Addycję metakrylanu glicydylu i kwasu fumaropimarowego prowadzono w obecności zasadowego katalizatora.

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In a Diels-Alder reaction, laevopimaric acid prepd. by isomerization of abietic acid was added to maleic anhydride to yield maleopimaric acid which was hydrolyzed to yield fumaropimaric acid. This was made to react with glycidyl methacrylate and the resulting hexafunctional (hydroxypropyl) multimethacrylic monomer, a viscous liq., was dissolved in Me methacrylate or styrene to yield solutions contg. 25, 50 and 75% of MMA or styrene. These compns. were UV-cured for 2 hrs./25°C and then for 6 hrs./130°C. In the uncured condition, the viscosity of the 75% MMA and styrene solns. was lower from the 25% solns. by a factor of 85 and 120, resp. The indentation hardness and the elasticity module were max. in the homopolymer, 151 MPa and 4.54 GPa, resp. If =50%, styrene improved the mech. and thermal properties of the cured compns. Generally, the properties of the 75% MMA and the 75% styrene copolymers were close to those of poly(methyl methacrylate) and polystyrene, resp.