Abstract
With good thermal properties, dielectric property and high-temperature ceramics performance, silicon-containing arylacetylene resin (PSA) has opened an attractive alternative to high performance thermosetting resins in application in the area of aircraft and missile. However, it is difficult to introduce silicon into the main chain of organic arylacetylene. In this paper, branched silicon-containing arylethyleneacetylene (BSA) resin was synthesized by methyltrichlorosilane and diethynylbenzene with zinc powder as catalyst. The advantages lie in simple operation, short reaction period and mild heat release. BSA resin exhibits excellent processability with the processing temperature of 20?C - 150?C and processing window of 130?C. The glass transition temperature of the resin casting is over 500?C. The temperature of 5% weight loss (Td5) is up to 575?C and char yield of thermoset at 800?C (Y800) reaches 91% under nitrogen. Also, the dielectric constant and dielectric loss of casting has no change within 10 - 106 Hz.
Highlights
Since 20th century, many countries have strived to develop aviation industry
In this paper, branched silicon-containing arylethyleneacetylene (BSA) resin was synthesized by methyltrichlorosilane and diethynylbenzene with zinc powder as catalyst
The results shown that the Td5 of thermoset is 575 ̊C in the nitrogen atmosphere, the yield of thermoset at 800 ̊C (Y800) was 91%, which indicates that BSA resin has high heat-resistant performance
Summary
Since 20th century, many countries have strived to develop aviation industry. The development of aviation technologies can reflect the comprehensive strength of a country. Jiang H [8] et al used zinc chloride catalyzed polycondensation reaction of diethynylbenzene and aminosilane, and synthesized PSA resin containing terminal amino group. This reaction is quick and has high yield, but the terminal amino group impairs the thermal stability of resin. We prepared branched silicon-containing arylethyleneacetylene resin (BSA) by diethynylbenzene and methyltrichlorosilane catalyzed by zinc power. The molecular weight of BSA resin is easy to control, the reaction process is simple, and there is no heat released; the crosslinking density of thermoset is higher, and thermoset has better thermal property; terminal olefinic on the molecular chain reduces the viscosity of resin which improving the processability of resin. Diethynylbenzene (DEB, purity > 98%, prepared by Shanghai Like Chemical Technology Co., Ltd.); Methyltrichlorosilane (MTS, purity > 98%, purchased by Acros Organics); zinc powder (AR, bought from Sinopharm Group); acetonitrile (AR), toluene (AR), hydrochloric acid (AR), acetone (AR) were purchased by Lingfeng Chemical Reagent Co., Ltd
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