首页> 外文期刊>Journal of Applied Polymer Science >THE RELATION BETWEEN SYNTHESIS PARAMETERS AND MORPHOLOGY OF ANIONIC POLYCAPROAMIDE OBTAINED IN ORGANIC MEDIA .1. INFLUENCE OF THE NA[O(CH2)(2)OCH3](2)ALH2/ISOPHORONE DIISOCYANATE CATALYTIC SYSTEM
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THE RELATION BETWEEN SYNTHESIS PARAMETERS AND MORPHOLOGY OF ANIONIC POLYCAPROAMIDE OBTAINED IN ORGANIC MEDIA .1. INFLUENCE OF THE NA[O(CH2)(2)OCH3](2)ALH2/ISOPHORONE DIISOCYANATE CATALYTIC SYSTEM

机译:有机介质中阴离子型聚己酰胺的合成参数与形貌的关系1。 NA [O(CH2)(2)OCH3](2)ALH2 /异醌二异氰酸酯催化体系的影响

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Polycaproamide granules were obtained by anionic polymerization of caprolactam in ethylbenzene, using the sodium bis(2-methoxyethoxy)aluminium hydride/isophorone diisocyanate catalytic system. Under these conditions, polymerization occurs heterogeneously and the nature of the particle growth seems to be essentially a microbulk one. The most suitable reaction conditions were established. The morphology of the granules was investigated by scanning electron microscopy. These granules result from the coalescence of a great number of small, spherical particles. The coalescence occurs during solidification of the separated polymer. Numerous globular formations were observed at the surface of the particles. The particles were individualized through mechanical dispersion and measured, and the average number of particles composing the aggregates was calculated. Using wide-angle X-ray scattering and differential scanning calorimetry technics, the crystalline structure of the granular polycaproamide was studied. It contains almost entirely the cu phase. The heat of fusion decreases slightly as compared with that corresponding to the anionic bulk polycaproamide. A schematic mechanism containing the stages involved in the obtaining of the granular polycaproamide is proposed. (C) 1996 John Wiley & Sons, Inc. [References: 29]
机译:使用双(2-甲氧基乙氧基)氢化铝钠/异佛尔酮二异氰酸酯催化体系,通过己内酰胺在乙苯中的阴离子聚合反应获得聚丙烯酰胺颗粒。在这些条件下,聚合反应是非均质的,并且颗粒生长的性质似乎本质上是一种微团。确定了最合适的反应条件。通过扫描电子显微镜研究颗粒的形态。这些颗粒是由于大量小球形颗粒的聚结而产生的。在分离的聚合物固化期间发生聚结。在颗粒表面观察到许多球状形成。通过机械分散使颗粒个体化并进行测量,并且计算出构成聚集体的颗粒的平均数目。利用广角X射线散射和差示扫描量热技术研究了聚己酰胺颗粒的晶体结构。它几乎完全包含cu相。与对应的阴离子本体聚己酰胺相比,熔融热略有降低。提出了包含颗粒状聚己酰胺的各个阶段的机理示意图。 (C)1996 John Wiley&Sons,Inc. [参考:29]

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