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POTENTIAL ABILITY OF NANO-SIZED NUCLEATING AGENT

机译：纳米核成核剂的潜在能力

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Agreement in lattice dimensions between a polymer lamellar crystal and a heterogeneous substrate such as nucleating agents, dominates the epitaxial growth of the polymer crystal in the nucleation and crystallization process. Sodium ethylene-bis-(2,4-di-t-butylphenyl) phosphate is known to exhibit excellent agreement in lattice dimension, resulting in enhanced nuclei generation. In the course of our studies, a potassium salt of the above phosphate was found to provide even better agreement in lattice dimensions than the sodium salt. Although the potassium salt is therefore expected to demonstrate superior nucleation ability compared to the sodium salt, the difference in the rate of nuclei generation between them was found to be insignificant, in particular, to be negligible at higher supercooling temperatures such as those experienced during molding. This result is consistent with theoretical considerations based on the thermodynamics of crystallization. In addition, both theoretical aspects and experimental results indicated that providing other heterogeneous surfaces having better agreement in lattice dimensions than phosphate salts is not necessarily effective in increasing the nucleation ability. Increase in nuclei density is suggested to be preferable rather than development of new chemical structures. From this point of view, a nano-sized nucleating agent was prepared and was evaluated. The nano-nucleated polypropylene demonstrated extremely high crystallization temperature and crystallization rate. This suggests that the nano-nucleated polypropylene has a possibility to provide superior mechanical properties for PP which may be comparable to some engineering plastics.
机译：在聚合物片状晶体和异质衬底例如成核剂之间的晶格尺寸协议，占主导地位的聚合物晶体的成核和结晶过程中外延生长。乙烯 - 双 - 钠（2,4-二叔丁基苯基）磷酸酯是已知的在晶格尺寸表现出优异的协议，从而提高晶核生成。在我们的研究过程中，上述磷酸盐的钾盐被发现提供在晶格尺寸比钠盐甚至更好的协议。虽然钾盐因此预期相比钠盐展示优异的成核能力，在它们之间的晶核产生的速率的差异被认为是不显着，特别是在更高的过冷温度下可忽略的，如那些成型过程中经历。这个结果是基于结晶的热力学理论考虑是一致的。此外，这两种理论方面和实验结果表明，提供具有在晶格尺寸比磷酸盐更好的协议的其他异构表面不按递增的成核能力不一定有效。增加核密度建议将是优选的，而不是新的化学结构的发展。从这个角度来看，纳米尺寸的成核剂已经准备并进行评价。纳米核的聚丙烯表现出非常高的结晶温度和结晶速率。这表明纳米成核的聚丙烯具有这样的可能性，以提供PP优异的机械性能，其可以是与一些工程塑料。

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