Preparation and performance of fluorescent thermal conductive silicone elastomers

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Abstract Fluorescent vinyl-silicone oils with different molecular weights were synthesized by the Heck reaction between 1-bromopyrene and vinyl-terminated silicone oils. The chemical structure of fluorescent silicone oil was characterized by NMR and Fourier transform infrared spectroscopy, and its optical properties were characterized by fluorescence spectrophotometer and UV-Vis absorption spectrophotometer. Fluorescent silicone elastomers (PyPDMS) were prepared using fluorescent silicone oil and crosslinking agent through crosslinking at high temperature. The hardness, crosslinking density, mechanical properties and thermal stability of PyPDMS were explored. The results show that the fluorescent elastomers have lower hardness (25.8 to 39.4 H00), smaller crosslinking density and high thermal stability. In the mechanical properties, compared with non-fluorescent elastomers(PDMS), the introduction of fluorescent groups increase the elongation at break of PyPDMS-2 to 1.64 times that of PDMS-2, and the tensile strength and elongation at break of PyPDMS-3 were both increased to 1.94 times and 1.13 times that of PDMS-3 respectively. In the oil bleeding test of elastomers, fluorescent silicon elastomers can fluorescently trace the exudation of substances and monitor its exudation in real time, and the amount of oil bleeding of PyPDMS is significantly reduced compared with PDMS, which can be used to control the oil bleeding of the silicone thermal conductive material in practical application.

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	Articles by authors
	ZHANG Man
	MA Xingxing
	FENG Yakai

Keywords： fluorescence silicone elastomer mechanical properties oil bleeding

Received 2021-04-07;

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ZHANG Man, MA Xingxing, FENG Yakai.Preparation and performance of fluorescent thermal conductive silicone elastomers[J] Chemcial Industry and Engineering, 2022,V39(5): 30-38

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