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Titolo:
INFLUENCE OF MOLECULAR-WEIGHT ON THE THERMAL-DECOMPOSITION OF HYDROXYL TERMINATED POLYBUTADIENE
Autore:
PANICKER SS; NINAN KN;
Indirizzi:
VIKRAM SARABHAI SPACE CTR,PROPELLANT & SPECIAL CHEM GRP THIRUVANANTHAPURAM 695022 KERALA INDIA VIKRAM SARABHAI SPACE CTR,PROPELLANT & SPECIAL CHEM GRP THIRUVANANTHAPURAM 695022 KERALA INDIA
Titolo Testata:
Thermochimica acta
fascicolo: 2, volume: 290, anno: 1997,
pagine: 191 - 197
SICI:
0040-6031(1997)290:2<191:IOMOTT>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
KINETICS; BINDERS;
Keywords:
GPC MOLECULAR WEIGHT; HTPB; KINETIC PARAMETERS; SOLID PROPELLANT BINDER; THERMAL DECOMPOSITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
S.S. Panicker e K.N. Ninan, "INFLUENCE OF MOLECULAR-WEIGHT ON THE THERMAL-DECOMPOSITION OF HYDROXYL TERMINATED POLYBUTADIENE", Thermochimica acta, 290(2), 1997, pp. 191-197

Abstract

Thermogravimetric analysis of hydroxyl terminated polybutadiene (HTPB) and its fractions of different molecular weights separated by preparative GPC shows two major stages of weight loss of different nature ina nitrogen atmosphere. The first stage is primarily depolymerisation,cyclisation and crosslinking of molecules and the second stage is mainly the decomposition of the residue from the first stage. The kineticparameters, viz. activation energy E and pre-exponential factor A using four different non-isothermal integral equations show a systematic increase with increase in molecular weight for the first stage, whereas for the second stage, the effect of molecular weight on E and A values is not prominent. The increase in E and A values for the first stage is attributed to the formation of greater number of cyclised and crosslinked products from molecules of higher dimensions. Quantitative correlations between the kinetic constants and the molecular weight parameters were derived for the first stage as a quadratic curve followingthe equation: E or lnA = K-1 - K-2/M (where K-1 and K-2 are empiricalconstants whose values are different for the different molecular weight averages, viz. M-n, M-w and M-z and for the different equations). (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 22:10:43