Results 191 to 200 of about 11,287 (255)

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

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

The Role of Polytetrahydrofuran (PTHF) as Reactive Plasticizer on the Processing and Performance of Hydroxyl‐Terminated Polybutadiene (HTPB)‐Based Polyurethane Elastomers

Journal of Applied Polymer Science
Despite better processing and flexibility, conventional plasticizers, being unbound additives, tend to migrate, which adversely affects the structural integrity of the end product by modifying mechanical properties.
N. Tahir, Syazana Ahmad Zubir
semanticscholar   +1 more source

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
openaire   +1 more source

Investigating the Impact of Systematic Hard Segment Modulation on Performance of Hydroxyl Terminated Polybutadiene (HTPB) Thermoset Polyurethane Elastomers

Journal of Applied Polymer Science
Despite the versatility and extensive applications of hydroxyl‐terminated polybutadiene (HTPB)‐based thermoset polyurethanes (PUs), research on tailoring their performance through hard‐segment modulation is limited.
N. Tahir, Syazana Ahmad Zubir
semanticscholar   +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

NMR Analysis of Thermally‐Oxidized Hydroxyl‐Terminated Polybutadiene (HTPB)

ChemistrySelect
Nuclear magnetic resonance spectroscopy was employed to monitor the change in chemical structures, olefin units (cis, trans and vinyl) and hydroxyl value on stabilized Hydroxyl‐terminated polybutadiene (HTPB) under accelerated ageing condition.
Muhammad Irfan, Cheng Kai Pu, Zheng Gang Xiao, Ji Jun Xiao   +3 more
semanticscholar   +1 more source

Chemical Modification of Hydroxyl-Terminated Polybutadiene and Its Application in Composite Propellants

, 2021
In this article, hydroxyl-terminated polybutadiene (HTPB) was chemically transformed into multiamine, hydroxy polybutadiene (AEHTPB) by the adoption of appropriate synthesis strategies.
Pingan Zhang, Wenjiayi Tan, Xi-long Zhang, Juan Chen, Jianmin Yuan, Jianru Deng   +5 more
semanticscholar   +1 more source

Crack propagation velocity and fracture toughness of hydroxyl-terminated polybutadiene propellants: Experiments and simulations

Engineering Fracture Mechanics, 2021
A critical part of failure analysis in solid rocket motors is understanding the fracture behavior of solid propellants. For single-edge notched tension (SENT) specimens of hydroxyl-terminated polybutadiene (HTPB) propellant, self-developed in-situ video ...
Ting‐yu Wang, Jinsheng Xu, Hui Li, W. Ding, Jia-ming Liu, Xiong Chen   +5 more
semanticscholar   +1 more source

Thermal Degradation Behavior of Thermally‐Oxidized Hydroxyl‐Terminated Polybutadiene (HTPB): An Assessment of Thermal Stability

ChemistrySelect
Thermal analysis was performed on different thermally oxidized hydroxyl‐terminated polybutadiene (HTPB) samples, varying in molecular weights, polydispersities, and viscosities.
Muhammad Irfan, J. Xiao
semanticscholar   +1 more source