Investigations on the influence of multiple extrusion on the degradation of polyolefins was written by Schweighuber, Andrea;Felgel-Farnholz, Alexander;Boegl, Thomas;Fischer, Joerg;Buchberger, Wolfgang. And the article was included in Polymer Degradation and Stability in 2021.Electric Literature of C73H108O12 This article mentions the following:
The importance of mech. recycling of polymers has increased within the last decades, especially due to numerous regulations of governments all over the world. Hereby recycling quotas are enforced to pave the way towards a closed loop recycling. During its lifetime, polymers are exposed to multiple environmental factors, which can already induce degradation However, a major factor that needs to be taken into account is the increased thermo-mech. stress during the recycling process, which may have significant impact on the quality of recyclates as well. In the present work, polyolefins (high-d. polyethylene and polypropylene) were artificially exposed to stress by continuous extrusion at varying speeds and absence or presence of stabilizers to analyze the extent to which the recycling contributes to degradation processes. These samples were analyzed for low-mol.-weight stress markers by thermodesorption gas chromatog. and by high-performance liquid chromatog. (both coupled to mass spectrometric detection). Depending on the extent of stress, the occurrence of odd-numbered linear alkane chains was revealed in polyethylene samples, and of oxidized branched alkanes in polypropylene samples. Correlations with mol. weight (determined by high temperature gel permeation chromatog.) and with decreasing concentrations of stabilizers could be demonstrated. 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: 6683-19-8Electric Literature of C73H108O12).
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. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Electric Literature of C73H108O12
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics