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首页> 外文会议>The Ninth International Conference Additives 2000: Plastics for the new Millennium, April 10-12, 2000, Clearwater Beach, Florida >The many - sided Effects of Stabilizer Mass on UV Stability of Polyolefins
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The many - sided Effects of Stabilizer Mass on UV Stability of Polyolefins

机译：稳定剂质量对聚烯烃紫外线稳定性的多方面影响。

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摘要

There is considerable confusion concerning the influence of stabilizer mass on performance in polyolefins. For this reason, some of the data available are examined more specifically with respect to this effect. The first part of this work concerns the effect of stabilizer mass observed with Polypropylene. It is found that the effect depends strongly on sample form and exposure conditions. In thick PP samples for which surface protection is especially important, there is considerable decrease of performance if the stabilizer molecular mass increases from approximately 500 to approximately 800. The second part of hte presentation compares the effect of low molecular mass HALS to the effect of medium and high molecular mass HALS in Polyethylene. The data show that the relative performance of low and high molecular mass HALS in PE is also depending on sample form and exposure conditions. Under ideal conditions there can be slight superiority of low molecular mass HALS over medium and high molecular mass HALS in polyethylene. Hence,the difference between polypropylene and polyethylene is of a quantitative rather than of a qualitative nature. Protection of the surface layers is less important with polyethylene than with polypropylene but is nevertheless significant. The results are important from a practical as well as from a fundamental point of view. First of all, they confirm that optimum stabilization requests the right choice of stabilizer or stabilizer system for a given application or sample form under specific exposure conditions. Secondly, the results show the consecutive and simultaneous influence of increasing molecular mass on volatility, diffusion, compatibility and amorphous domain occupation. The physico-chemical aspects of the varying effects of molecular mass are outlined briefly.
机译：关于稳定剂质量对聚烯烃性能的影响存在很大的困惑。因此，将针对此效果更具体地检查一些可用数据。这项工作的第一部分涉及使用聚丙烯观察到的稳定剂质量的影响。发现效果很大程度上取决于样品形式和暴露条件。在其中表面保护尤为重要的厚PP样品中，如果稳定剂分子量从大约500增加到大约800，性能会大大降低。本报告的第二部分将低分子量HALS的作用与中等的作用进行了比较。聚乙烯中的高分子量HALS。数据表明，PE中低分子量和高分子量HALS的相对性能还取决于样品形式和暴露条件。在理想条件下，聚乙烯中的低分子量HALS优于中等分子量和高分子量HALS。因此，聚丙烯和聚乙烯之间的差异是定量的而不是定性的。聚乙烯对表面层的保护不如聚丙烯重要，但意义重大。从实际以及从根本的角度来看，结果都很重要。首先，他们确认最佳稳定化要求在特定的暴露条件下针对给定的应用或样品形式正确选择稳定剂或稳定剂系统。其次，结果表明增加分子量对挥发性，扩散，相容性和无定形域占据的连续和同时影响。简要概述了分子质量变化影响的物理化学方面。

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