Hernández-Fernández Joaquín, Guerra Yoleima, Puello-Polo Esneyder, Marquez Edgar
Chemistry Program, Department of Natural and Exact Sciences, San Pablo Campus, University of Cartagena, Cartagena 130015, Colombia.
Centro de Investigación en Ciencias e Ingeniería, CECOPAT&A, Cartagena 131001, Colombia.
Polymers (Basel). 2022 Jul 31;14(15):3123. doi: 10.3390/polym14153123.
This article studies the effects of arsine on the synthesis and thermal degradation of 4 samples of virgin polypropylene (PP-virgin) and proposes reaction mechanisms that allow understanding of its behaviour. Different points are monitored during the polypropylene synthesis to perform TGA, DSC, FT-IR, RDX, and MFI analyses later. The content of AsH in polypropylene varies between 0.05 and 4.73 ppm, and of arsenic in virgin PP residues between 0.001 and 4.32 ppm for PP0 and PP10, increasing in fluidity index from 3.0 to 24.51. The origin of thermo-oxidative degradation is explained by the reaction mechanisms of the Molecule AsH with the active titanium center of the ZN catalyst and the subsequent oxidation to form radical complexes. OO-AsH-TiCl-MgCl and (OO-as-OO) -TiCl-MgCl, which, by radical reactions, give rise to the formation of functional groups aldehyde, ketone, alcohol, carboxylic acid, CO, CO, PP-Polyol, PP-Polyether, and PP-Isopropylethers. These species caused the TG and DTG curves to increase degradation peaks in pp samples.
本文研究了砷化氢对4种纯聚丙烯（PP- virgin）样品合成及热降解的影响，并提出了有助于理解其行为的反应机理。在聚丙烯合成过程中监测不同点，以便随后进行热重分析（TGA）、差示扫描量热法（DSC）、傅里叶变换红外光谱（FT-IR）、落镖冲击试验（RDX）和熔体流动指数（MFI）分析。对于PP0和PP10，聚丙烯中AsH的含量在0.05至4.73 ppm之间变化，纯PP残渣中砷的含量在0.001至4.32 ppm之间，熔体流动指数从3.0增加到24.51。热氧化降解的起源通过分子AsH与ZN催化剂的活性钛中心的反应机理以及随后氧化形成自由基络合物来解释。OO-AsH-TiCl-MgCl和(OO-as-OO)-TiCl-MgCl通过自由基反应产生官能团醛、酮、醇、羧酸、CO、CO、PP-多元醇、PP-聚醚和PP-异丙基醚。这些物质导致pp样品的TG和DTG曲线降解峰增加。
