Inversion Features of the High-Elastic Deformability of Epoxy Polymers

Study of the Effect of Laproxides on the Physical Properties and Deformation Behaviour of Epoxy–Bisphenol a Polymers

“…They make it possible actively to influence the topological organisation of three-dimensional networks and accordingly the thermodeformation, inversion, and deformation and strength properties of the epoxy polymers [2]. In connection with the noted trend of practical application not only of the high elasticity effect of densely crosslinked polymers and filled matrices but also of their inversion features [3,4], it is of scientific and practical interest to investigate the effect of mono-and difunctional laproxides on the formation of the physical structure and properties of the most popular industrial polyepoxides.…”

“…They make it possible actively to influence the topological organisation of three-dimensional networks and accordingly the thermodeformation, inversion, and deformation and strength properties of the epoxy polymers [2]. In connection with the noted trend of practical application not only of the high elasticity effect of densely crosslinked polymers and filled matrices but also of their inversion features [3,4], it is of scientific and practical interest to investigate the effect of mono-and difunctional laproxides on the formation of the physical structure and properties of the most popular industrial polyepoxides.The investigation was conducted on epoxy-bisphenol A resins ED-20 and ED-16 (GOST 10587-84), and also on reactive laproxide modifiers -monofunctional laproxide 301G (TU 2226-337-10488057-97) (abbreviated below to L-301):and difunctional laproxide 702 (TU 2226-335-10488057-07) (abbreviated below to L-702):where R -m = 9-11.T h e c u r i n g a g e n t e m p l o y e d w a s isomethyltetrahydrophthalic anhydride (iso-MTHPA, acid number 665.0 15.0), and the curing accelerator was 2,4,6-tris(dimethylaminomethyl)phenol (UP 606/2).The amount of curing agent (X cur ) was determined with account taken of the content of epoxy groups in the modifier according to the empirical equation: X cur = 1.5(2605/AN)EG, g/100 g where AN is the acid number of the curing agent, and EG is the content of epoxy groups (%).Composites based on resins ED-16 and ED-20 with a content of each of the laproxides of 1, 3, 5, and 7% and a stoichiometric amount of curing agent with accelerator were prepared.…”