Nechitailo, N. A. published the artcileDihydric phenols as stabilizers for irradiated polypropylene, COA of Formula: C14H22O2, the publication is Plasticheskie Massy (1966), 37-41, database is CAplus.
Polypropylene (I) of mol. weight 390,000 after addition of 0.1 mmol of stabilizer/g. was irradiated with 60Co γ-rays at an intensity of 1.0-1.5 megarads/h. in vacuo with a dose of 160 megarads or in air with a dose of 40 megarads. After irradiation, the fraction insoluble in o-xylene and intrinsic viscosity (in Decalin at 135°) of I were determined As stabilizers hydroquinone (II), 2-methylhydroquinone (III), 2-tert-butylhydroquinone (IV), 2-tert-octylhydroquinone (V), 2,5-di-tert-butylhydroquinone (VI), pyrocatechol (VII), 4-methylpyrocatechol (VIII), 4-tert-butylpyrocatechol (IX), 4-tert-octylcatechol (X), and 3,5-di-tert-butylpyrocatechol (XI) were used. The oxidation of I with air was determined by DTA and ir anal. γ-rays caused fission of chains and a decrease in mol. weight and softening temperature; simultaneously, crosslinking took place and an insoluble gel was formed. In the absence of air, no oxidation took place and only IX, X, and XI decreased the destruction of I; the amount of gel formed in I without stabilizers was 77.5%, and with II 68.0%, III 54.8%, IV 50.3%, V 43.7%, VI 67.0%, VII 40%, VIII 15.0%, IX 14.2%, X 71.0%, and XI 8.7%. Dihydric phenols shifted the temperature of the oxidation initiation to higher temperatures; the effect of alkyl derivatives of VII containing tert-Bu groups was especially strong. Oxidation of I irradiated in the presence of air was weakened by the addition of several phenols (no formation of a gel fraction, strong diminution of absorption by OH groups in the ir spectrum). The intrinsic viscosity of I irradiated in the presence of air was 0.13 for pure I (before irradiation 3.2), for II 0.11, III 0.23, IV 0.13, V 0.22, VI 0.13, VII 0.31, VIII 0.31, IX 0.20, X 0.11, and XI 0.17.
Plasticheskie Massy published new progress about 1139-46-4. 1139-46-4 belongs to alcohols-buliding-blocks, auxiliary class Benzene,Phenol, name is 4-(2,4,4-Trimethylpentan-2-yl)benzene-1,2-diol, and the molecular formula is C14H22O2, COA of Formula: C14H22O2.
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