Polymer crystallization by chemical nucleation
Polymer crystallization by chemical nucleation
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DOI：
10.1038/304432a0
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发表时间：
1983-08
期刊：
影响因子：
64.8
通讯作者：
R. Legras;J. Mercier;E. Nield
中科院分区：
文献类型：
--
作者：
R. Legras;J. Mercier;E. Nield
已经做了几个实验1 - 5来控制结晶速率和形态，通过添加非常细的物质来促进大量的成核。然而，这些研究大多是在经验的基础上进行的，除了少数情况下（自晶种6，外延2 -5），这些成核剂的作用机制知之甚少，尽管在建模1，2尝试。在大多数技术成核剂如云母、滑石和有机盐的情况下尤其如此。我们在这里报告，有机成核剂，如苯甲酸钠及其衍生盐的作用机制完全不同于普遍接受的模型，至少在聚酯的情况下。成核剂作为真正的化学试剂与熔融的大分子反应并产生构成真正的成核物质的离子端基。
Several attempts1–5have been made to control the rate of crystallization and the morphology by the addition of very finely-divided substances which promote abundant nucleation. However, these studies have mostly been carried out on an empirical basis and, except in a few cases (self-seeding6, epitaxy2–5), the mechanism of action of these nucleating agents is poorly understood despite several attempts at modelling1,2. This is particularly so in the case of most technical nucleating agents such as mica, talc and organic salts. We report here that the mechanism of action of organic nucleating agents such as sodium benzoate and its derived salts completely differs from the generally accepted model, at least in the case of polyesters. The nucleating agent reacts as a true chemical reagent with the molten macromolecules and produces ionic end groups which constitute the true nucleating species.