Static and Dynamic Mechanical Behavior of Electron Beam-Cured Monomer and Monomer/Liquid Crystal Systems

✍ Scribed by Aline Olivier; Leila Benkhaled; Tadeusz Pakula; Bernd Ewen; Andreas Best; Mustapha Benmouna; Ulrich Maschke

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 160 KB
• Volume: 289
• Category: Article
• ISSN: 1438-7492
• DOI: 10.1002/mame.200400224

✦ Synopsis

Abstract

Summary: This paper discusses static and dynamic mechanical properties of electron beam‐cured mixtures made of the nematic liquid crystal (LC) E7 and either tripropyleneglycol diacrylate (TPGDA) or propoxylated glycerol triacrylate (GPTA) as monomers differing essentially by their functionality. Dilution of the initial mixture with LC leads to a significant weakening of the film mechanical strength. Strong effects were found on Young modulus and rubbery state modulus. As the concentration of LC increases, these mechanical parameters drop significantly together with the glass transition temperature of the polymer showing a plasticizing effect. The results for the glass transition temperatures for the polymer and the LC were confirmed by thermograms obtained by differential scanning calorimetry.

Storage tensile modulus versus temperature of EB‐cured TPGDA/E7 films for different LC concentrations.

imageStorage tensile modulus versus temperature of EB‐cured TPGDA/E7 films for different LC concentrations.