Davand, Razieh published the artcileTheoretical and experimental assessment of UV resistance of high-density polyethylene: Screening and optimization of hindered amine light stabilizers, Synthetic Route of 52829-07-9, the main research area is hindered amine stabilizer polyethylene UV resistance.
Hindered amine light stabilizers (HALS) are widely used chem. stabilizers for preventing polymer degradation In this study, the effects of type of HALS and its content in high-d. polyethylene (HDPE) over the stabilization process are investigated employing d. functional theory (DFT) and exptl. approach. The electrophilicity index of four types of com. HALS are compared by DFT to select the most effective one. Besides, the HDPE sample containing a phenolic antioxidant and different contents of the selected HALS are exptl. exposed to UV irradiation The effect of HALS content on the changes in chain microstructure and mol. weight of HDPE are evaluated using gel permeation chromatog. and frequency sweep rheometry. In the absence of HALS, HDPE suffers degradation and the phenolic antioxidant causes chain scission. However, by adding HALS, the chain branching and crosslinking mechanisms are predominant. The results of FTIR, DSC, and tensile analyses follow similar trends, revealing that the best stabilization performance corresponds to adding 600 ppm HALS to HDPE.
Journal of Applied Polymer Science published new progress about Crystallinity. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Synthetic Route of 52829-07-9.
Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem