Abstract
The relationship between the chemical structure and physical properties of ultra-violet cured isophorone diisocyanate (IPDI) and toluene diisocyanate (TDI) based urethane acrylates were studied. The two systems were prepared with varying soft-segment molecular weight and cross-linker content. Dynamic mechanical test results show one-phase or two-phase materials may be obtained depending on the soft-segment molecular weight. With increasing soft-segment molecular weight, the polyol glass transition shifts to lower temperatures. Increasing the cross-linker content using either N-vinylpyrrolidone (NVP) or polyethyleneglycol diacrylate (PEGDA) causes an increase in Young's modulus and ultimate tensile strength. Cross-linking with NVP causes an increase in toughness in the two-phase materials and shifts the high-temperature glass transition peak to higher temperatures. In contrast, an increase in PEGDA content does not improve the toughness of the two-phase materials or affect the position of the high-temperature glass transition peak. Comparison of the tensile properties of the TDI- and IPDI-based systems shows no significant differences.
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