The influence of cyclization and crosslinking on the properties and networks of photoinitiated
multifunctional methacrylate polimers derived from succinic anhydride
and their copolimers with styrene
Polimery 2010, No 4, 277
A comparison of some properties of new multifunctional methacrylate esters obtained in a three-step synthesis from cis-hexahydrophtalic or succinic anhydrides, glycidyl methacrylate and methacrylic and acrylic acids is presented. The addition reactions of the acidic substrates with glicydyl methacrylate were performed in the presence of 2,4,6-tri(dimethylaminomethyl)phenol. Homopolymers of the tested methacrylates and their copolymers with styrene were obtained by the photopolymerization process. The thermal and mechanical properties of all the obtained products were determined. Dynamic mechanical analysis results and the estimation of double bond conversion revealed various degrees of intramolecular cyclization and intermolecular crosslinking reactions in the polymers obtained from two different anhydrides. The products obtained from the methacrylate derivatives of succinic acid are characterized by higher crosslinking density values, but lower unsaturated bond conversion as compared to their cis-hexahydrophtalic analogues. A qualitative analysis of the degree of structural heterogeneity of the obtained polymeric networks and the influence of their structure on the properties of the new polymeric materials were elucidated. On the whole, the results presented in this work confirm the possibility of the occurrence of competitive crosslinking and cyclization reactions during the polymer hardening process which influence the properties of the obtained products.
Key words: photopolymerization, methacrylates, unsaturated bond conversion, network structure, properties
The influence of cyclization and crosslinking on the properties and networks of photoinitiated multifunctional methacrylate polimers derived from succinic anhydride and their copolimers with styrene