Physical and Mechanical Properties of a Photopolymer System before and after UV Curing. 1. Experimental Studies

Experimental and theoretical studies of the physical and mechanical properties of a Resione D01 photopolymer resin before and after photocuring under the action of UV irradiation are conducted. In the first part of the study, internal friction spectra $$\lambda = f\left( T \right)$$ and temperature dependences of frequency $${{\nu }} = f\left( T \right)$$ of a freely decaying oscillatory process are obtained in a temperature range of −150 to 250°C using a method of dynamic mechanical relaxation spectroscopy. It is found that spectra $${{\lambda }} = f\left( T \right)$$ of all the studied systems are characterized by the presence of several local dissipative processes with different intensities which manifest themselves in different temperature ranges. The correlation of the abnormal change in frequency $${{\nu }} = f\left( T \right)$$ with shear modulus defect $$\Delta G = f\left( T \right)$$ and mechanisms of internal friction for the most intensive processes of dissipative losses is for the first time analyzed. Based on the obtained experimental results, the temperature ranges in which photopolymer materials possess stable physical and mechanical properties are found. The theoretical analysis that will be performed in the second part of the study of the physical and mechanical properties of the photopolymer takin into account the obtained experimental data will be a development of the experimental study.