Polymer/Phenanthrene‐Derivative Host‐Guest Systems: Rheological, Optical and Thermal Properties

Abstract

Starting from commercially‐available, polymer‐based reactive resins like acrylates or unsaturated polyesters, a systematic investigation was carried out as to the influence organic dopants like phenanthrene and its derivatives have on the optical and thermal properties of the mixtures resulting from curing to the final thermoplastic polymer. The refractive index of PMMA at 633 nm can be increased, starting from 1.49 for the pure polymer, up to a value of around 1.55, and, in the case of the polyester, from 1.565 up to 1.6. The transmittance in the visible range is slightly affected at a lower dopant concentration of up to 10 wt.‐%, and remains better than 80% for a sample with a thickness of 1 mm, in the range between 500 and 800 nm. An unwanted side‐effect of larger dopant concentrations is to lower the glass transition temperature significantly.magnified image

Tailoring the optical and thermomechanical properties of polymer host–guest systems

“…As shown earlier, increasing the phenanthrene concentrations caused an almost linear increase of n. 19,20,24 The addition of DVB should have caused a further rise of n because of the presence of easily polarizable electrons in the aromatic molecule. Figure 4 shows the change of n with the phenanthrene content at zero and a 32 wt % DVB amount.…”

Polymer-Nanoparticle Composites: From Synthesis to Modern Applications

“…In case of small filler concentrations and almost identical density values for the polymer and the filler or dopant, as described in [130], the relation simplifies to formula (2) (concentrations in wt %). $n_{composite}=n_{matrix}\ast c_{\text{}matrix}+n_{filler}\ast c_{filler}$ $n_{composite}=n_{matrix}+n_{filler}\ast c_{filler}$…”

Unsaturated Polyesters and Vinyl Esters

“…The optical and dielectric properties of UPRs have recently also been modified by the addition of electron-rich small organic molecules such as phenanthrene or benzochinoline with the intention of potentially enabling them for use as polymeric capacitors embedded in printed circuit boards [186b], or as wave-guides, lenses, or prisms [187]. The positive effect of these dopants is attributed to their high molecular polarizability.…”