Grand, Caroline;Cogen, Jeffrey M.;Wills, Scott T. published 《Stability of phenolic antioxidants in the presence of sulfonic acid: model compound studies for moisture-crosslinked polyethylene》. The research results were published in《Polymer Degradation and Stability》 in 2021.Formula: C23H32O2 The article conveys some information:
Alkoxysilane-functionalized polyethylene can be crosslinked in the presence of acid catalysts, including Bronsted acids, to yield durable pipe and cable insulation materials. To provide guidelines for the selection of stable phenolic antioxidants in the presence of Bronsted acids, reactions of 4 model alkylphenol compounds in the presence of p-dodecylbenzenesulfonic acid (DBSA) in dodecane were studied as a solution model for polyethylene-based systems. The results point to increasing stability towards DBSA of phenolic compounds when: (i) alkyl groups have less substitution (tertiary carbon compared to quaternary carbon), (ii) they have alkyl-substitution in the para position, and (iii) they have a reduced number of alkyl substituents around the phenol ring. Antioxidants with alkyl or isocyanurate bridges had reaction rates comparable to butylated hydroxytoluene (BHT) and followed the trend outlined in model alkylphenols. The sulfur-bridged antioxidant stood out as rapidly consumed under the reaction conditions. Therefore, selection of phenolic antioxidants for formulations containing strong Bronsted acids should generally favor phenolic compounds with alkyl-substituted para positions and limited number of alkyl substituents in non-para positions, and without quaternary carbon substituents. Moreover, stability of alternate sulfur-containing antioxidants should be assessed if used with sulfonic acids, given the rapid decomposition of the sulfur-bridged antioxidant observed in this work. And 2,2-Methylenebis(6-tert-butyl-p-cresol) (cas: 119-47-1) was used in the research process.
Formula: C23H32O22,2′-Methylenebis(4-methyl-6-tert-butylphenol)(CAS: 119-47-1) is a natural product found in Streptomyces and Aspergillus fumigatus .
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