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Correlation between the mechanical properties and the homogeneity of some photopolymerized acrylic/methacrylic networks1

✍ Scribed by A. Lungu; D. C. Neckers

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
475 KB
Volume
34
Category
Article
ISSN
0887-624X

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✦ Synopsis

Proton T,, data obtained by CP/MAS solid-state 13C NMR a t 100.56 MHz for different polyacrylate networks were correlated with their mechanical properties in order to determine the best mixture in terms of stress-at-break (a), Young's modulus of elasticity (Y), and homogeneity of the monomers that are forming the solid network. The mixtures were formed by the photopolymerization of 40% trimethylolpropane triacrylate (TMPTA), 40% dipentaerythritol pentaacrylate (DPHPA), and 20% of a monomer from a series of poly(ethy1ene glycol) and poly(ethy1ene) dimethacrylate. Proton TIP)s in networks were not quite averaged to a single value by spin diffusion as in polymer blends, indicating extensive intermixing of TMPTA and DPHPA in forming the network, but with phase separation between the dimethacrylate homopolymer and the rest of the network that is dependent on the laser power. The stress-at-break and the Young's modulus of elasticity were determined for each of the mixtures at different values of the laser power used for the polymerization.

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