New developments of polymeric dental composites

Films containing a photoreactive mixture of a liquid-crystalline diacrylate and an isotropic monoacrylate were UV exposed by means of lithographic and holographic techniques, resulting in a spatial intensity distribution in the films. The favored depletion of the more reactive diacrylate at sites with maximum UV intensity results in preferred diffusion of this monomer to these areas. The monoacrylate oppositely diffuses to the sites with minimum intensity which, depending on polymer ratios and liquid-crystalline transition temperatures, eventually leads to a phase transition from the nematic to the isotropic phase. In this way holographic gratings were prepared exhibiting high diffraction efficiencies due to the alternation of lines of optically oriented and of isotropic materials. The diffusion process was successfully simulated by a simple polymerization and diffusion model and was verified by fluorescent labeling experiments in combination with fluorescence microscopy.

Photoinduced Opposite Diffusion of Nematic and Isotropic Monomers during Patterned Photopolymerization

Aromatic liquid crystalline epoxy resin (LCE) based on naphthalene mesogen was synthesized and cured with aromatic diamines to prepare heat-resistant LCE networks. Diaminodiphenylester (DDE) and diaminodiphenylsulfone (DDS) were used as curing agents. The curing reaction and liquid crystalline phase of LCE were monitored, and mechanical and thermal properties of cured LCE network were also investigated. Curing and postcuring peaks were observed in dynamic DSC thermogram. LCE network cured with DDE displayed liquid crystalline phase in the curing temperature range between 183 and 260°C, while that cured with DDS formed one between 182 and 230°C. Glass transition temperature of cured LCE network was above 240°C, and crosslinked network was thermally stable up to 330°C. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 419–425, 1999

Synthesis and curing of liquid crystalline epoxy resin based on naphthalene mesogen

Polymerization of liquid-crystalline monomers having a Schiff-base structure

Broadband reflective films were prepared by thermal diffusion of zinc oxide nanoparticles (ZnO NPs) in chiral nematic liquid crystals (N*-LCs). Ultraviolet (UV) light was irradiated in the directio...

Broadband reflection in polymer-stabilized cholesteric liquid crystal film with zinc oxide nanoparticles film thermal diffusion method

Kinetic study of the photoinitiated polymerization of a liquid crystalline diacrylate monomer by d.s.c. in the isothermal mode

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Kinetic study of the photoinitiated polymerization of a liquid crystalline diacrylate monomer by d.s.c. in the isothermal mode