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Low-density organic aerogels by double-catalysed synthesis

机译:通过双催化合成的低密度有机气凝胶

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Organic aerogels are usually obtained by polycondensation of formaldehyde with a phenol derivative under basic conditions; This paper examines the lowest density that carl be achieved with a basic or acid catalyst in the case of phloroglucinol. We show that under basic conditions, shrinkage or gel time prevent densities below 0.030 g cm(-3). Under acid conditions, no homogeneous gelation occurs and the lowest density obtained is 0.023 g cm(-3). A new double base-acid catalyzed process makes organic aerogels with density of 0.013 g cm(-3). (C) 1998 Elsevier Science B.V. All rights reserved. [References: 10]
机译:有机气凝胶通常是在碱性条件下通过甲醛与酚衍生物的缩聚反应制得的。本文研究了间苯三酚在碱性或酸性催化剂中可达到的最低密度。我们表明,在基本条件下,收缩或胶凝时间可防止密度低于0.030 g cm(-3)。在酸性条件下,不会发生均相凝胶化,并且获得的最低密度为0.023 g cm(-3)。一种新的双碱-酸催化工艺可制造密度为0.013 g cm(-3)的有机气凝胶。 (C)1998 Elsevier Science B.V.保留所有权利。 [参考:10]

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