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首页> 外文会议>International Conference on Modification, Degradation and Stabilization of Polymers(MoDeSt 2002); 2002; Budapest; HU >UV Stabilising Synergies between Carbon Black and Hindered Light Stabilisers in Linear Low Density Polyethylene Films
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UV Stabilising Synergies between Carbon Black and Hindered Light Stabilisers in Linear Low Density Polyethylene Films

机译：线性低密度聚乙烯薄膜中炭黑和受阻光稳定剂之间的紫外线稳定增效作用

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摘要

The combined effects of selected carbon black pigments and hindered light stabilisers (HALS) on the UV stabilities of linear low density polyethylene film have been studied under UVA and UVB fluorescent radiation sources. While the presence of HALS do not change the chemistry of film photodegradation, whether they are low or high molecular variants, their presence significantly extends film lifetime relative to the sum of the effects of carbon black and HALS individually. These lifetime extensions may be defined in terms of a synergy factor defined with respect to film time to lose a specific percentage of a tensile property, namely t_(20), the time to lose 20% of initial elongation-at-break, or the carbonyl index associated with this condition. It is proposed that possible causes of this synergy are a result of the UV screening effect of the carbon black particles which provide lower concentrations of polymer radicals for the HALS component to interact with and/or an accompanying thermal stabilising effect by the latter as a consequence of the higher polymer local temperature during irradiation of pigmented films.
机译：在UVA和UVB荧光辐射源下，研究了所选炭黑颜料和受阻光稳定剂（HALS）对线性低密度聚乙烯薄膜紫外线稳定性的综合影响。尽管HALS的存在不会改变薄膜光降解的化学性质，无论它们是低分子变体还是高分子变体，但相对于炭黑和HALS的总和而言，它们的存在显着延长了薄膜的寿命。这些寿命的延长可以根据协同作用因子来定义，该协同作用因子是相对于失去特定百分比的拉伸性能的薄膜时间即t_（20），失去初始断裂伸长率的20％的时间或与此相关的羰基指数。提出这种协同作用的可能原因是炭黑颗粒的紫外线屏蔽作用的结果，该炭黑颗粒为HALS组分提供了较低浓度的聚合物自由基，使其与HALS相互作用和/或随之而来的热稳定作用。着色膜辐照过程中较高的聚合物局部温度的变化。

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