Synthesis o hexahydropyrimidine derivatives ad their polymer stabilising properties

• Autorzy: Beresnevičius Z. J. , Mickevičius V. , Rutkauskas K. , Kantminienë K.
• Języki publikacji: EN

Abstrakty

EN

Twenty nine l-aryldihydro-2,4(lH,3H)-pirimidinediones, their 2-thio analogues, and 5- and 6-methyl homologues were investigated as stabilisers of thermooxidative destruction. These derivatives of hexahydropyrimidine were synthesised by reaction of the corresponding N-aryl-, N-aryl-a-methyl- or N-aryl-b-methyl-b-alanines with carbamide or potassium rhodanide in acetic acid with the further addition of hydrochloric acid. It was determined, that l-(4-hydroxy-3,5-diisopropylphenyl)dihydro-2,4(lH,3H)-pyrimidinedione was the best stabiliser for poly(vinyl chloride). Low-density polyethylene was effectively stabilised by l-(4-phenylaminophenyl)dihydro-4(lH,3H)-pyrimidinone-2-thione. l-(l-Naphthyl)-, l-(2-naphthyl)- and l-(4-hydroxyphenyl)dihydro-4(lH,3H)-pyrimidinone-2-thiones were suitable stabilisers for polycaprolactam, polyamides PA 12 and PA 610. l-(Hydroxyphenyl)-6-methyldihydro-4(lH,3H)-pyrimidinone-2-thione was soluble in ethanol and therefore was suitable for stabilisation of polyamide by diffusion. l-(l-Naphthyl)- and l-(4-phenylaminophenyl)dihydro-4(lH,3H)-pyrimidinone-2-thiones were better stabilisers of polyacetals than NG 22-46 and other industrial stabilisers. Cellulose di- and triacetates were stabilised the best by l-(l-naphthyl)-5 (and 6)-methyldihydro-4(lH,3H)-pyrimidinone-2-thiones which were soluble in methylenechloride and acetone.

Słowa kluczowe

EN

polymers; stabilisation; and oxidative destruction

PL

polimery; stabilizacja; utlenianie niszczące

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2003
• Tom: Vol. 5, nr 3
• Strony: 75--81
• Opis fizyczny: Bibliogr. 5 poz., rys., tab.

Twórcy

autor

Beresnevičius Z. J.

autor

Mickevičius V.

autor

Rutkauskas K.

autor

Kantminienë K.

• Kaunas University of Technology, Radvilenf pi. 19, LT-3028 Kaunas, Lithuania, fax: [phone],

Bibliografia

• (1) Beresnevičius, Z. J., N-Rryl-, N-heteroaryl-b-alanines, - aspartic acids and heterocyclic compounds on their basis, Habil. Dr. Thesis, Kaunas, 1989 (in Russian).
• (2) Baltručis, R. S., Beresnevičius, Z. J. H., Vizgaitis, J. M., 1- Phenyl-5(6)-methyldihydrouracils and their transforrnations, Chemistry of Heterocyclic Compounds, 1981, 8, 1097 (in Russian).
• (3) Baltručis, R. S., Beresnevičius, Z. J. H., Vizgaitis, J. M., Gatilov, J. V., Synthesis and structure of 1-(1-naphtyl)dihydrouracil derivatives, Chemistry of Heterocyclic Compounds, 1983,9,1267 (in Russian).
• (4) Baltručis, R. S., Beresnevičius, Z. J. H., Synthesis of 1-(2- naphtyl)dihydro-, 1-(2-naphtyl)-2-thiodihydrouracils and their transformations, Chemistry of Heterocyclic Compounds, 1971, 12, 1695 (in Russian).
• (5) Baltručis, R. S., Beresnevičius, Z. J. H., Mickevićius, V. J., Synthesis and transforrnations of 1-(4-oxyphenyl)dihydrouracils, Chemistry of Heterocyclic Compounds, 1982, 10, 1400 (in Russian).