Results 201 to 210 of about 10,094 (259)
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Urethane Elastomers Based on Hydroxyl Terminated Polybutadienes
Journal of Elastoplastics, 1971This 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 ...
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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 +1 more
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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 +1 more
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ChemistrySelect
Hydroxyl‐terminated polybutadiene (HTPB) is hydrogenated using catalytic hydrogenation with HTPB as a precursor using various catalysts. The hydrogenation is carried out using iso‐propyl alcohol (IPA) and toluene as an active solvent media.
Ch. Devi Vara Prasad +3 more
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Hydroxyl‐terminated polybutadiene (HTPB) is hydrogenated using catalytic hydrogenation with HTPB as a precursor using various catalysts. The hydrogenation is carried out using iso‐propyl alcohol (IPA) and toluene as an active solvent media.
Ch. Devi Vara Prasad +3 more
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Catalysis of Blocked Isocyanate-Hydroxyl-Terminated Polybutadiene Cure Reaction
Journal of Macromolecular Science, Part A, 1996The 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 +2 more
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Azo initiators for the preparation of hydroxyl‐terminated polybutadienes
Journal of Polymer Science: Polymer Chemistry Edition, 1983AbstractAzo 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 +2 more
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Viscoelastic behavior of hydroxyl terminated polybutadiene containing glycerin
Journal of Applied Polymer Science, 2011AbstractHydroxyl 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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Single Step Synthesis of Nitro‐Functionalized Hydroxyl‐Terminated Polybutadiene
Propellants, Explosives, Pyrotechnics, 2013AbstractThe paper reports the energization of Hydroxyl‐Terminated Polybutadiene (HTPB) by functionalizing explosophore NO2 over the HTPB backbone, resulting in the formation of conjugated nitro‐alkene derivative of HTPB. A convenient, inexpensive and efficient “one pot” procedure of synthesizing Nitro‐Functionalized Hydroxyl‐Terminated Polybutadiene ...
C. Shekhar Pant +3 more
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Properties of modified hydroxyl-terminated polybutadiene based polyurethane membrane
Journal of Membrane Science, 2002Abstract One hydroxyl-terminated polybutadiene (HTPB) based polyurethane (PU) solution was prepared by reacting equal equivalent of 4,4-methylene diphenyl diisocyanate (MDI) and HTPB with 1,4-butanediol (BDO) as chain extender. The PU was then cast into membrane.
Jen Ming Yang, Hao Tzu Lin, Wen Chin Lai
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Tensile property of modified hydroxyl-terminated polybutadiene-based polyurethanes
Journal of Applied Polymer Science, 1997Modified 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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Propellants, explosives, pyrotechnics
Considering the high toxicity of toluene diisocyanate (TDI) and the low reactivity of isophorone diisocyanate (IPDI), a low‐toxicity curing agent, dimer acid diisocyanate (DDI), was used to cross‐link HTPB elastomers and propellants.
Kai Xin +4 more
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Considering the high toxicity of toluene diisocyanate (TDI) and the low reactivity of isophorone diisocyanate (IPDI), a low‐toxicity curing agent, dimer acid diisocyanate (DDI), was used to cross‐link HTPB elastomers and propellants.
Kai Xin +4 more
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