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Titolo:
Thermal stabilisation of PVC with metal soaps of Khaya seed oil
Autore:
Okieimen, FE; Eromonsele, OC;
Indirizzi:
Univ Benin, Dept Chem, Benin City, Nigeria Univ Benin Benin City Nigeria niv Benin, Dept Chem, Benin City, Nigeria
Titolo Testata:
ANGEWANDTE MAKROMOLEKULARE CHEMIE
, volume: 269, anno: 1999,
pagine: 8 - 15
SICI:
0003-3146(199908)269:<8:TSOPWM>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(VINYL CHLORIDE); DEHYDROCHLORINATION; DEGRADATION; STABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Okieimen, FE Univ Benin, Dept Chem, Benin City, Nigeria Univ Benin Benin City Nigeria pt Chem, Benin City, Nigeria
Citazione:
F.E. Okieimen e O.C. Eromonsele, "Thermal stabilisation of PVC with metal soaps of Khaya seed oil", ANGEW MAKRO, 269, 1999, pp. 8-15

Abstract

Khaya seed meal was extracted with n-hexane. The oil obtained had an iodine value of 68.0 g I-2/100 g, an acid value of 24.0 mg KOH/100 g, free fattyacid 7.64 wt.-%, and a peroxide value of 26.0 meq/kg. The fatty acid profile of the oil showed that oleic acid (54.34 wt.-%), palmitic acid (19.05 wt.-%) and stearic acid (10.42 wt.-%) were the major fatty acid components ofthe seed oil. Barium, calcium, cadmium, lead and zinc soaps of the seed oil and of its epoxidised derivative were prepared using the precipitation method and the thermal stability examined by thermogravimetry. The stabilising effect of the metal soaps of Khaya seed oil on the thermal degradation ofPVC was assessed at 180 degrees C and 190 degrees C from measurements of rates of dehydrochlorination at 1% degradation and of the time required for degradation to attain 1% dehydrochlorination conversion, and changes in intrinsic viscosity and in the levels of unsaturation of the degraded PVC samples. It was found that the metal soaps of Khaya seed oil were effective in stabilising PVC against non-oxidative and oxidative thermal degradation andthat the stabilisation effectiveness was of the order: metal soaps of the epoxidised seed oil > metal soaps of the unepoxidised seed oil > seed oil.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 21:36:54