Effects of composition and plastifier on the light scattering of polymer glasses and properties of polymeric optical fibers made from styrene‐methyl methacrylate copolymers

Abstract

High optical purity polystyrene (PS), poly(methy1 methacrylate) (PMMA) and styrene-methyl methacrylate statistical copolymers (S-MMA) were prepared. Light scattering measured on polymeric glasses depends on the chemical composition of the polymer and on the refractive index of the plastifier added. An isorefractive plastifier reduces considerably the scattering values for the copolymers S-MMA, while having no significant effect on the scattering of PMMA. A plastifier with a refractive index different from that of the polymer raises distinctly the light scattering values in all cases.It has been shown that the isorefractive plastifier has a favourable effect on attenuation loss of polymeric optical fibers (POF) obtained from the copolymer S-MMA 2/1. ZUSAMMENFASSUNG:Optisch hochreine Glaser wurden aus Polystyrol (PS), Polymethylmethacrylatund statistischen Styrol-Methylmethacrylat-Copolymeren (S-MMA) hergestellt. Die an diesen Glasern gemessene Lichtstreuung hangt von der chemischen Zusammensetzung des Polymeren und dem Brechungsindex des zugesetzten Weichmachers ab. Ein isorefraktiver Weichmacher verringert die Streuwerte der S-MMA-Copolymeren, hat aber keinen signifikanten Einflulj auf das Streuverhalten von PMMA. Ein Weichmacher mit einem vom Polymeren verschiedenen Brechungsindex verschlechtert die Streuwerte in allen untersuchten Fallen. Es wird gezeigt, dalj ein isorefraktiver Weichmacher die Dampfungseigenschaften von aus dem Copolymeren S-MMA 2/1 gezogenen polymeren Lichtleitern verbessert.

Dynamics of Composition Fluctuations in Statistical Copolymer Solutions

“…The reaction mixtures were filtered through PTFE membrane filters with the 0.2 μm pore diameter into ampules, free oxygen in three freeze−thaw cycles, and sealed under vacuum. The polymerization was initiated thermally by heating the samples for 18 h at 120 °C followed by 8 h at 150 °C. On completion of the polymerization, the ampules were slowly cooled to room temperature.…”

Influence of associations on self-diffusion of styrene-methylmethacrylate random copolymers in semidilute acetone solution

“…21. Sample sm 2/8* was radically polymerized in bulk with AIBN as the initiator at a temperature of 60°C up to a conversion of 5% by standard procedure.…”

Dynamics in Solutions of Associating Statistical Copolymers

“…The reaction mixtures were filtered through PTFE membrane filters with a pore diameter of 0.2 µm into glass ampules, freed from oxygen by three freezethaw cycles, and sealed in a vacuum. The polymerization was initiated thermally 24 by heating for 18 h at 120 °C followed by 8 h at 150 °C. On completion of the polymerization, the ampules were slowly cooled to room temperature.…”