Thermal and environmental stability of poly(4-ethynyl-p-xylylene-co-p-xylylene) thin films

• 作 者: Yu Liang Xiaopei Deng Jay J.Senkevich Hao Ding Joerg Lahann
• 机 构: Department of Material Science and Engineering,China University of Geosciences (Beijing),Department
• 出 处: Chinese Chemical Letters
• 发表日期: 2015年04期
• 关键词: azide click annealed ambient polymerization transformed thermally reactivity coa

The aim of this paper was to test the thermal and environmental stability of poly(4-ethynyl-p-xylyleneco-p-xylylene) thin films prepared by chemical vapor deposition(CVD) and to optimize the reaction conditions of the polymer.Fourier transformed infrared spectroscopy(FTIR),thermogravimetric analysis(TGA) and fluorescence microscopy were employed to investigate the stability of the reactive polymer coatings in various environmental conditions.Chemical reactivity of the thin films were then tested by Huisgen 1,3-dipolar cycloaddition reaction(‘‘click’’ reaction).The alkyne functional groups on poly(4-ethynyl-p-xylylene-co-p-xylylene) thin films were found to be stable under ambient storage conditions and thermally stable up to 100 8C when annealed at 0.08 Torr in argon.We also optimized the click reaction conditions of azide-functionalized molecules with poly(4-ethynyl-p-xylylene-co-p-xylylene).The best reaction result was achieved,when copper concentration was 0.5 mmol/L,sodium ascorbate concentration to copper concentration was 5:1.In contrast,the azide concentration and temperature had no obvious effect on the surface reaction.

The aim of this paper was to test the thermal and environmental stability of poly (4-ethynyl-p-xylyleneco-p-xylylene) thin films prepared by chemical vapor deposition (CVD) and to optimize the reaction conditions of the polymer. Infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and fluorescence microscopy were employed to investigate the stability of the reactive polymer coatings in various environmental conditions. Chemical reactivity of the thin films were then tested by Huisgen 1,3-dipolar cycloaddition reaction (’ ’click’ ’reaction). The alkyne functional groups on poly (4-ethynyl-p-xylylene-co-p-xylylene) thin films were found to be stable under ambient storage conditions and thermally stable up to 100 8C when annealed at 0.08 Torr in argon. We also optimized the reaction conditions of azide-functionalized molecules with poly (4-ethynyl-p-xylylene-co-p-xylylene) sodium asco rbate concentration to copper concentration was 5: 1. In contrast, the azide concentration and temperature had no obvious effect on the surface reaction.