Issue 4, 2019

Platinum free thermally curable siloxanes for optoelectronic application – synthesis and properties

Abstract

Polysiloxanes for applications in the area of optical devices are usually based on two-component platinum catalysed cross-linked materials. Here we report the synthesis and properties of a novel one-component siloxane that can be thermally cured showing similar tailorable properties like commercially available encapsulation systems without using a noble metal catalyst. The pre-curing material is formed by an acid catalysed condensation reaction of trialkoxysilanes (TAS), dialkoxysilanes (DAS) and alkoxy-terminated polysiloxanes. NMR analysis of the formed polymeric compounds reveal that the materials are partially cross-linked gels. The obtained compounds can be thermally cured and consolidated at temperatures between 160 and 200 °C. Depending on the composition a tuneable hardness in between 50–90 Shore A, refractive indices of 1.494–1.505, as well as high temperature stabilities up to 443 °C were obtained. The high thermal- and photostability, the high transparency, as well as the tailorable refractive index makes these materials to ideal systems for optoelectronic applications. Investigations under increased temperatures and high-density illumination reveal that the material can withstand conditions, which are typical for high-performance light emitting diodes (LED).

Graphical abstract: Platinum free thermally curable siloxanes for optoelectronic application – synthesis and properties

Supplementary files

Article information

Article type
Paper
Submitted
28 Nov 2018
Accepted
05 Jan 2019
First published
17 Jan 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 2205-2216

Platinum free thermally curable siloxanes for optoelectronic application – synthesis and properties

N. Steinbrück, S. Pohl and G. Kickelbick, RSC Adv., 2019, 9, 2205 DOI: 10.1039/C8RA09801H

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