Effects of UV Irradiation on the Molecular Structure and Tensile Properties of Nucleated Polypropylene

Tao, You; Jie, Gan Xin; Zhang, Xiao Dong; Hu, Li; Jian, Peng; Wang, Jun; Feng, Hao

doi:10.4028/www.scientific.net/amr.905.82

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The thermal stability of PP would be changed under irradiation due to the molecular chain of PP is extremely sensitive to UVA. 21 The melting curves are shown in Figure 5A,B,a,b, and the melting temperatures (T m ) of PP with and without MPP samples irradiated for different times are also shown in Figure 5C,c.…”

Section: Resultsmentioning

confidence: 99%

Photoaging and Fire Performance of Polypropylene Containing Melamine Phosphate

Xue

Wang

et al. 2020

ACS Appl. Polym. Mater.

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This work investigated the effect of melamine phosphate (MPP) on the photoaging process of polypropylene (PP) and correlated photoaging and fire performance. The PP composites containing MPP were prepared by melt blending before being exposed to UVA light for different periods. The irradiated PP composite samples were characterized by the analysis of tensile properties, surface topography, thermal degradation, and carbonyl index. In contrast to conventional halogenated flame retardants and ammonium polyphosphate, we confirmed that the presence of MPP significantly delayed the aging process and improved the thermal stability of PP. The carbonyl index of the PP composite containing 20 phr MPP was decreased by 60% after being irradiated for 60 h compared with that of the control PP sample. The flammability characterization revealed that the aging process had a minimal effect on the fire performance of the PP composite. This work has demonstrated that the addition of MPP is an effective approach for imparting flame retardancy with a long life cycle to polymeric composites.

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Section: Resultsmentioning

confidence: 99%

Photoaging and Fire Performance of Polypropylene Containing Melamine Phosphate

Xue

Wang

et al. 2020

ACS Appl. Polym. Mater.

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“…Mechanical material removal rates (MMRRs) were determined by measuring the mass changes of the workpieces before and after polishing [44][45][46]. Equation (10) is the formula used to calculate the mechanical material removal rate:…”

Section: Pneumatic Wheel Processing Testmentioning

confidence: 99%

Material Removal Characteristic of Laser Cladding Cobalt-Based Alloy in the Photochemical Process

Zeng

et al. 2019

Metals

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Cobalt-based alloy materials, widely used for laser cladding, are difficult to process. To address this problem, and based on the analysis of the physicochemical properties of cobalt and its compounds, a method for removing cobalt-based alloy materials under photocatalytic conditions was proposed under the effect of ultraviolet photocatalysis and chemical corrosion. In this study, a material removal model under photocatalytic conditions was established, and the reaction principle of cobalt-based alloys under ultraviolet photocatalysis and chemical corrosion conditions was described. We designed a corrosion solution configuration test and established a cobalt-based alloy processing test based on a pneumatic wheel test platform. The processing test proved that the combination of ultraviolet (UV) photocatalysis and Basic Yellow 40 + TiO 2 chemical corrosion pretreatment can significantly increase the mechanical material removal rate of cobalt-based alloy materials and effectively reduce surface roughness. At the same time, processing efficiency can be increased over 40%. This showed that the new method is capable of performing well in the field of mold cobalt-based alloy coating processing in the future.

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Effects of UV Irradiation on the Molecular Structure and Tensile Properties of Nucleated Polypropylene

Cited by 2 publications

References 15 publications

Photoaging and Fire Performance of Polypropylene Containing Melamine Phosphate

Photoaging and Fire Performance of Polypropylene Containing Melamine Phosphate

Material Removal Characteristic of Laser Cladding Cobalt-Based Alloy in the Photochemical Process

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