Results 181 to 190 of about 3,611 (220)

Functionality Distribution of Carboxyl- and Hydroxyl-Terminated Polybutadiene

Journal of Macromolecular Science: Part A - Chemistry, 1973
Abstract Elurion from silica gel was used to fractionate liquid polymers according to the number of chemically reactive groups per molecule (the functionality). Methods are presented for the functionality fractionation of high and low functionality carboxyl-terminated polybutadiene (CTPB).
M. S. Chang, D. M. French, P. L. Rogers
openaire   +1 more source

High-Pressure Combustion Characteristics of Hydroxyl-Terminated Polybutadiene Propellants

Journal of Propulsion and Power, 2023
Combustion mechanisms of propellants under high pressures are necessary to solve the problems of a high burning rate pressure exponent in high-pressure solid rocket motors. In this study, the combustion characteristics of hydroxyl-terminated polybutadiene (HTPB) propellants were investigated by analyzing the burning rate, the quenched surface, and the ...
Jinchao Han, Songqi Hu, Linlin Liu, Pengxiang He   +3 more
openaire   +1 more source

Polyurethane based on hydroxyl‐terminated polybutadienes

British Polymer Journal, 1971
AbstractButadiene has been found to homopolymerise and copolymerise with other reactive vinyl monomers to yield unique liquid polymers which are terminated with reactive allylic hydroxyl groups. Through the use of an isocyanate cure reaction they offer a route to liquid castable general purpose elastomers, capable of reinforcement with various fillers ...
openaire   +1 more source

Combinations of hydroxyl‐terminated polybutadiene and boron

Journal of Polymer Science: Polymer Chemistry Edition, 1985
AbstractMixing and curing experiments with suspensions of boron in hydroxyl‐terminated polybutadiene (HTPB) have been performed. In kneading experiments on a plastograph very high viscous masses with bad curing properties were obtained. The experiments indicated that HTPB is attached with its OH groups to acidic impurities on the surface of the boron ...
openaire   +1 more source

Studies on Hydroxyl Terminated Polybutadiene Toughened Phenolic Resin

High Performance Polymers, 2006
Phenolic novolac was modified with hydroxyl terminated polybutadiene (HTPB) using resole as compatibilizer. These systems were characterized by differential scanning calorimetry, and IR analysis. Neat resin castings were prepared with varying percentages of HTPB.
C. Nirmal, S. N. Maithi, T. Padmavathi, A. Vanaja, R. M. V. G. K. Rao   +4 more
openaire   +1 more source

Urethane Elastomers Based on Hydroxyl Terminated Polybutadienes

Journal of Elastoplastics, 1971
This article describes the preparation and properties of urethane elastomers based on hydroxyl-terminated polybutadienes. The liquid nature of these polybutadiene systems allows easy reaction with isocyanates even at ambient temperatures. Properties of elastomers produced can be easily improved by either chemical modification of the polymer backbone ...
openaire   +1 more source

Synthesis and characterization of terminally functionalized and epoxidized hydroxyl-terminated polybutadiene

Polymer Bulletin, 2011
Pyridyl N-oxide derivatives of hydroxyl terminated polybutadiene-pyridine (HTPB-PY) were synthesized via functionalization on terminal carbon atoms of HTPB backbone by 2-chloropyridine and epoxidation of C=C bonds and N atoms using in situ generated dimethyl dioxirane (DMD).
Mir Mohammad Alavi Nikje, Hassan Hajifatheali   +1 more
openaire   +1 more source

Catalysis of Blocked Isocyanate-Hydroxyl-Terminated Polybutadiene Cure Reaction

Journal of Macromolecular Science, Part A, 1996
The catalytic activity of three tertiary amines and three organotin compounds in the cure reaction of blocked isocyanate with hydroxyl-terminated polybutadiene was investigated. It was found that the steric factor determines the catalytic activity of the compound. The tin compounds showed higher catalytic activities than the amine compounds.
H. Kothandaraman, A. Sultan Nasar, K. R. Suresh   +2 more
openaire   +1 more source

Azo initiators for the preparation of hydroxyl‐terminated polybutadienes

Journal of Polymer Science: Polymer Chemistry Edition, 1983
AbstractAzo compounds such as di(4‐hydroxybutyl)‐2,2′‐azobisisobutyrate, di(3‐hydroxybutyl)‐2,2′‐azobisisobutyrate, di(2‐hydroxypropyl)‐2,2′‐azobisisobutyrate, and di(2‐hydroxyethyl)‐2,2′‐azobisisobutyrate were prepared and used as initiators for the preparation of hydroxyl‐terminated polybutadienes (HTPBs) of molecular weight (M̄n) ranging from 2000 ...
B. B. Idage, S. P. Vernekar, N. D. Ghatge   +2 more
openaire   +1 more source

Viscoelastic behavior of hydroxyl terminated polybutadiene containing glycerin

Journal of Applied Polymer Science, 2011
AbstractHydroxyl terminated polybutadiene (HTPB) is widely used as a propellant binder. A plasticizer is usually added to improve the processing properties, the mechanical properties, and the burning characteristics of the propellant. Glycerin was found to be an effective additive to improve these properties.
openaire   +1 more source