Results 131 to 140 of about 883 (166)

Properties of hydroxyl‐terminated polybutadiene‐urethane systems

Journal of Applied Polymer Science, 1971
AbstractThe properties of liquid hydroxyl‐terminated polybutadiene (HTPB) stocks crosslinked with isocyanates of different functionalities were intensively investigated. The stocks were modified by inclusion of small proportions of various low molecular weight diols to increase the urethane concentration. The following studies were carried out: (1) the
John P. Consaga, David M. French
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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 ...
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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 ...
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Functionality distribution and crosslink density of hydroxyl‐terminated polybutadiene

Polymer International, 1993
Abstract A novel approach is proposed for estimating the average molecular weight between crosslinks (M̄ c ) from the functionality distribution of hydroxyl‐terminated polybutadiene ( HTPB ). The functionality distribution of four free‐
K. N. Ninan, V. P. Balagangadharan, K. Ambikadevi, K. B. Catherine   +3 more
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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 of
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Effects of thermal ageing on the properties and lifetime prediction of hydroxyl-terminated polybutadiene

Polymer, 1994
Abstract Thermal ageing of hydroxyl-terminated polybutadiene propellant binders was carried out at various temperatures between 50 and 100°C. The changes caused by this treatment in properties such as melt viscosity, functional end-groups, molecular weight, tensile strength, elastic modulus and ultimate elongation were examined.
A. Akbaş, S. Aksoy, N. Hasırcı
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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
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Tensile property of modified hydroxyl-terminated polybutadiene-based polyurethanes

Journal of Applied Polymer Science, 1997
Modified hydroxyl-terminated polybutadiene (HTPB)-based polyurethanes (PUs) were prepared by three different processes: crosslinkage of the soft segment, complexation of the hard segment, and the interpenetrating network (IPN). Crosslinked PU films were prepared by the addition of a crosslinking agent of divinylbenzene (DVB) to the 4,4 ...
Shih-Liang Huang, Juin-Yir Lai
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Preparation of Hydroxyl-Terminated Polybutadiene with High Cis-1,4 Content

Industrial & Engineering Chemistry Research, 2014
Hydroxyl-terminated polybutadiene (HTPB) with high cis-1,4 content (>95.0%) has been prepared via a two-step method by taking commercial butadiene rubber (BR9000) as a starting material, including the one-pot synthesis of aldehyde-group-terminated polybutadiene (ATPB) in high efficiency and the subsequent reduction reaction.
Qinzhuo Zhou, Suyun Jie, Bo-Geng Li
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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.
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