Influence of Polymerization Conditions on the Microindentation Properties of Poly(allyl(p-allylcarbonate)benzoate)

Authors: 
Galina Zamfirova, Valentin Gaydarov and Delia Lopez-Velazquez

Flat plates of poly(allyl(p-allylcarbonate) benzoate) obtained via photopolymerization and thermal polymerization have been studied by means of microindentation. The plates were about 3 mm thick. The values of microhardness (MHV)/total microhardness (MHT) have been determined. Accordingly, structural changes in the plate bulk due to the polymerization method were detected. The plates obtained by photopolymerization possess a superficial layer harder than the inner layers and its thickness is not uniform. Also, microindentention shows that the increase in the polymerization time during thermopolymerization leads to improved elasticity and resistance against plastic deformation. Microindentation data of the plates here studied shows that poor mechanical properties correspond to an unfinished network, while good mechanical properties correspond to a better crosslinked network.

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