Markedly improved photo-oxidation stability of α form isotactic polypropylene with nodular morphology was written by Wu, Hao;Zhao, Ying;Su, Lili;Wang, Kezhi;Dong, Xia;Wang, Dujin. And the article was included in Polymer Degradation and Stability in 2021.Category: esters-buliding-blocks This article mentions the following:
Photo-oxidation degradation behaviors of isotactic polypropylene (iPP) films with different crystalline morphol. were investigated by artificially accelerated aging test. The α form iPP with nodular morphol. was obtained by quenching the melt and subsequent annealing process, and its photo-oxidation degradation behavior was compared with that of the melt-crystallized α form iPP sample. Fourier transform IR spectroscopy, gel permeation chromatog., differential scanning calorimetry, X-ray scattering, dynamic mech. anal. and at. force microscopy were utilized to characterize the microstructural variations of these two kinds of iPP films during photo-oxidation degradation process. The results showed that iPP film of nodular morphol. exhibits improved photo-oxidation stability compared with that of lamellar and spherulitic structure. UV-Vis spectra and O2 diffusivity test of unexposed and aged samples demonstrated that the iPP film of nodular morphol. has higher transparency and lower O2 diffusivity than that of lamellar morphol. Combining the microstructural anal. and surface morphol. observation, the improved photo-oxidation stability of “nodular” iPP was correlated with its higher UV light transparency, lower O2 diffusion coefficient as well as the slower segmental mobility in the amorphous phase. In the experiment, the researchers used many compounds, for example, 2,2-Bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate) (cas: 6683-19-8Category: esters-buliding-blocks).
2,2-Bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate) (cas: 6683-19-8) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics