Pierre Delliere, Luc Vincent, Nicolas Sbirrazzuoli, Nathanael Guigo
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引用次数: 0
摘要
本文强调了呋喃树脂在高温下聚合后碳化前的现象。研究了呋喃树脂固化过程中大气（N2 和空气）的影响，结果表明，当暴露在温度高于 175 °C 的空气中时，呋喃树脂会形成芳香表面。固态核磁共振和红外光谱显示，芳香基团主要位于材料表面。研究人员提出了这种表面改性的机理，并进行了简短的动力学研究。此外，还对热机械性能进行了研究。芳香族表面降低了材料的阻尼能力，但却提高了材料的抗降解能力。最后，呋喃树脂的拉伸性能并没有因为芳香表面的存在而受到影响。
Oxygen-induced surface hardening and aromatization of thermoset furanic biobased resin: Origin and consequences
This article emphasizes the phenomena occurring in furan resins at high temperature, once they are polymerized and before their carbonization. The effects of the atmosphere (N2 and air) during the curing of furan resins were investigated and it is shown that upon exposure to air at temperatures above 175 °C, the furan resins develop an aromatic surface. By means of solid-state NMR and infrared spectroscopy, it is demonstrated that the aromatic groups are mainly located on the material's surface. A mechanism of this surface modification is proposed together with a short kinetic study. In addition, the thermo-mechanical properties are studied. The aromatic surfaces decrease the damping capacity of the material, yet its resistance to degradation is increased. Finally, tensile properties of the furan resins are not affected by the presence of this aromatic surface.
期刊介绍：
Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology.
Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal.
However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.
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