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首页> 外文期刊>Journal of Applied Polymer Science >Artificial weathering effect on the structure and properties of polypropylene/polyamide-6 blends compatibilized with PP-g-MA
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Artificial weathering effect on the structure and properties of polypropylene/polyamide-6 blends compatibilized with PP-g-MA

机译：人工风化对与PP-g-MA相容的聚丙烯/聚酰胺6共混物的结构和性能的影响

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摘要

The degradation of uncompatibilized and compatibilized PP/PA-6 (70/30 wt %) with PP-g-MA under accelerated UV light was investigated using Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy, melt flow index (MFI) tester, tensile test, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). FTIR analysis of the structure of the compatibilized and uncompatibilized blends after exposure to UV light showed the formation of photoproducts corresponding to both components. The MFI and mechanical results obtained revealed that photooxidation started primarily in PA-6 rather than PP. In addition, the uncompatibilized blends exhibited a higher degradation rate compared to neat polymers for long exposure time, and the addition of PP-g-MA increased slightly their ageing rate in accordance with TGA data. Further, DSC analysis showed an increase in the crystallinity index and a decrease in the melting temperature of PP and PA-6 after UV exposure either as neat polymers or as blend components. SEM micrographs of the cryo-fractured surfaces of the samples illustrated the formation of cracks and fractures after UV irradiation. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41722.
机译：使用傅立叶变换红外光谱（FTIR）光谱，熔体流动指数（MFI）测试仪，拉伸试验研究了不相容和相容的PP / PA-6（70/30 wt％）与PP-g-MA在加速紫外光下的降解，差示扫描量热法（DSC），热重分析（TGA）和扫描电子显微镜（SEM）。 FTIR分析了增容和不增容混合物在暴露于紫外线后的结构，结果表明形成了对应于两种组分的光产物。获得的MFI和机械结果表明，光氧化主要在PA-6而不是PP中开始。另外，与纯聚合物相比，在长时间的暴露时间下，不相容的共混物表现出更高的降解率，并且根据TGA数据，添加PP-g-MA使其老化率略有提高。此外，DSC分析表明，作为纯聚合物或作为共混组分，暴露于紫外线后PP和PA-6的结晶度指数增加，熔融温度降低。样品的低温断裂表面的SEM显微照片显示了紫外线照射后裂纹和断裂的形成。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41722。

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