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Ordered SiO_2-(phenolic-formaldehyde resin) in situ nanocomposites

机译：有序SiO_2-（酚醛树脂）原位纳米复合材料

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摘要

Nanocomposite materials consisting of monodisperse SiO_2 particles embedded in a polymerized resin matrix were produced by the adhesion of silica globules on the surface of a chemically modified phenolic-formaldehyde resin (MPFR) substrate that incorporates carboxylic groups in its molecules. Two routes were followed to obtain SiO_2 nanoparticles-MPFR materials. The first procedure consisted of the growth of an SiO_2 phase concurrently with the presence of MPFR molecules. The second procedure involved the preparation of a monodisperse SiO_2 sol that was subsequently mixed with an MPFR solution. The thermal curing of the MPFR resin phase at 80 deg C brought about thin SiO_2-MPFR flakes from samples obtained from procedure 1 whilst monolithic pieces arose from samples from procedure 2. During the curing process, silanol surface groups of the silica globules reacted with carboxylic groups of the MPFR molecules to create a reinforced SiO_2-MPFR substance that displayed ester bonds across the interface. Thermal treatments of specimens prepared by procedure 2 were performed at 150, 250, 400, 600 and 800 deg C to monitor the integrity of the resultant hybrid substrates. To assess the characteristics of SiO_2-MPFR materials, some of the main chemical, structural and textural characteristics of several specimens have been determined via FTIR, SEM and N_2 adsorption studies.
机译：纳米复合材料由嵌入到聚合树脂基体中的单分散SiO_2颗粒组成，是通过将二氧化硅小球粘附在化学修饰的酚醛树脂（MPFR）基板表面上而产生的，该基板分子中带有羧基。遵循两种途径获得了SiO_2纳米颗粒-MPFR材料。第一个步骤包括在存在MPFR分子的同时生长SiO_2相。第二步涉及制备单分散的SiO_2溶胶，然后将其与MPFR溶液混合。 MPFR树脂相在80℃下热固化，从步骤1的样品中得到薄的SiO_2-MPFR薄片，而步骤2的样品中出现了整体碎片。在固化过程中，二氧化硅球的硅烷醇表面基团与羧基反应MPFR分子形成一个增强的SiO_2-MPFR物质，该物质在界面上显示出酯键。在150、250、400、600和800摄氏度下对通过步骤2制备的样品进行热处理，以监控所得混合基板的完整性。为了评估SiO_2-MPFR材料的特性，已通过FTIR，SEM和N_2吸附研究确定了一些样品的一些主要化学，结构和组织特征。

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