Abstract
AbstractCopolymers of ethyl acrylate with three different dimethacrylates were prepared over the complete range of copolymer composition. Modulus temperature curves of these polymers were constructed and contrasted with the modulus temperature curves of phenol–formaldehyde type polymers. The ethyl acrylate–dimethacrylate polymers appeared to have rubbery plateau regions at high temperatures, even for very high mole percentages of dimethacrylate. This was especially true if the dimethacrylate molecule had a long flexible chain within it, as in tetraethylene glycol dimethacrylate. On the other hand the phenol–formaldehyde type polymers and polyethylene glycol dimethacrylate did not appear to have rubbery plateau regions. Up to 12 mole‐% of dimethacrylate the shear moduli of the ethyl acrylate copolymers in the rubbery plateau region were independent of the structure of the dimethacrylate at equivalent crosslink concentrations. Furthermore these polymers appear to obey the laws of ideal rubber elasticity with a front factor of unity.
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