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首页> 外文会议>SPE(Society of Plastics Engineers) International Polyolefins Conference 2007 vol.2 >POTENTIAL ABILITY OF NANO-SIZED NUCLEATING AGENT
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POTENTIAL ABILITY OF NANO-SIZED NUCLEATING AGENT

机译：纳米核剂的潜在能力

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摘要

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：聚合物层状晶体与异质基质（例如成核剂）之间的晶格尺寸一致，在成核和结晶过程中支配了聚合物晶体的外延生长。已知乙烯-双-（2,4-二叔丁基苯基）磷酸钠在晶格尺寸上表现出极佳的一致性，从而提高了核的生成。在我们的研究过程中，发现上述磷酸钾盐提供比钠盐更好的晶格尺寸一致性。因此，尽管期望钾盐比钠盐具有更好的成核能力，但是发现钾盐之间的成核速率差异不明显，特别是在较高的过冷温度下（如在模塑过程中经历的温度）可以忽略不计。 。该结果与基于结晶热力学的理论考虑相一致。另外，理论方面和实验结果均表明，提供晶格尺寸上比磷酸盐更好的其他异质表面在增加成核能力方面不一定有效。建议增加核密度，而不是开发新的化学结构。从这一观点出发，制备并评价了纳米级成核剂。纳米核聚丙烯显示出极高的结晶温度和结晶速率。这表明，纳米核聚丙烯有可能为PP提供与某些工程塑料可比的优异机械性能。

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