AI Article Synopsis
- Polypropylene (PP) has benefits like easy moulding but suffers from flammability and poor UV resistance; researchers explored modified zinc oxide (mZnO) to tackle these issues.
- Introducing mZnO with a specific flame-retardant ratio significantly improved PP's flame retardancy, achieving a UL-94V-0 rating and reducing heat and smoke release rates by over 80%.
- After 100 hours of UV exposure, the modified PP maintained good mechanical properties and flame retardancy, suggesting mZnO enhances durability and performance with less additive content.
Article Abstract
Despite the advantages of easy moulding and excellent mechanical properties, there are still some shortcomings with polypropylene (PP) such as high flammability and poor ultra-violet (UV) resistance. In this work, modified zinc oxide (mZnO) was prepared by reacting zinc oxide nanoparticles (ZnO) with polysiloxanes, and the effect of mZnO on the effectiveness of intumescent flame-retardant and on the UV aging resistance of polypropylene were investigated. By introducing 16 wt% (intumescent flame-retardant /mZnO) and 0.3 wt% maleic anhydride-grafted PP (MAH-g-PP), the limiting oxygen index increased to 32.7 %, and passed UL-94V-0 rating. In comparison to the controls, the peak heat release rate and the peak smoke release rate were 88.5 % and 80 % lower, respectively. In addition, PP samples showed improved mechanical properties, with a 5 % increase in tensile properties compared to the pure PP sample. After 100 h of UV irradiation, the surface of the samples was relatively flat and smooth, and the carbonyl index decreased from 81.1 of neat PP to 26.7. PP composites with 100 h aging treatment still had excellent flame retardancy and mechanical properties. The results showed that mZnO was effective in improving the flame retardancy, mechanical properties and light aging tolerance of PP. This study provides a novel approach to fabricate long-life flame-retardant PP composites with low additive content.
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| http://dx.doi.org/10.1016/j.jcis.2024.01.134 | DOI Listing |
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