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首页> 外文期刊>Journal of Applied Polymer Science >Outdoor weathering of polyamide and polyester ropes used in fall arrest equipment
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Outdoor weathering of polyamide and polyester ropes used in fall arrest equipment

机译：防坠落设备中使用的聚酰胺和聚酯绳的户外耐候性

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摘要

In this work, the effect of natural climatic aging on two ropes made from polyamide 6 (PA6) and poly(ethylene terephthalate) (PET) was evaluated. Samples of rope from both materials underwent a continuous outdoor aging treatment spanning 6 months in Montreal's weather. Tensile tests carried out on aged PA6 ropes showed an increase in ultimate strain and a decrease in breaking force when compared with as-received values, while PET ropes exhibited a slight increase in ultimate strain as their breaking force remained unchanged. FTIR analyses of aged PET samples revealed a new absorption band in the hydroxyl region ascribed to the ?￡?OH stretching vibrations of carboxylic acid end groups. FTIR quantitative analyses of the absorption bands in the carbonyl region of aged PA6 spectra displayed an increase in intensity that indicates the occurrence of chemical degradation reactions. The degree of crystallinity of PA6, calculated from differential scanning calorimetry data, was found to increase after the weathering treatment, a result confirmed by X-ray diffraction analyses. The higher crystalline fraction is believed to entail an increase in the density of PA6 fibers, which give rise to the length reduction seen in PA6 ropes after the aging treatment.
机译：在这项工作中，评估了自然气候老化对聚酰胺6（PA6）和聚对苯二甲酸乙二酯（PET）制成的两条绳索的影响。在蒙特利尔的天气中，两种材料的绳索样品均经过了连续六个月的户外室外老化处理。与按预期值相比，在老化的PA6绳索上进行的拉伸试验显示极限应变增加，而断裂力降低，而PET绳索由于断裂力保持不变，因此极限应变略有增加。老化的PET样品的FTIR分析表明，在羟基区域有一个新的吸收带，这是由于羧酸端基的πOH拉伸振动引起的。老化的PA6光谱的羰基区域中吸收带的FTIR定量分析显示强度增加，表明发生了化学降解反应。 X射线衍射分析证实了经风化处理后由差示扫描量热法数据计算得到的PA6的结晶度增加。据信较高的结晶分数导致PA6纤维密度的增加，这导致时效处理后PA6绳索的长度减少。

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