Investigation of the curing kinetics of polyurethane/nitrocellulose blends through FT‐IR measurements

Polyester (HTPS) based polyurethane (PU) elastomers were currently established to be effective binders for high‐energy composites with improved performances. Conventional PU binders are mostly non‐energetic materials, and consequently reduce the energy performance significantly. Nitrocellulose (NC),...

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Bibliographic Details
Published in:International journal of chemical kinetics 2023-02, Vol.55 (2), p.72-86
Main Authors: Touidjine, Sabri, Boulkadid, Moulai Karim, Trache, Djalal, Belkhiri, Samir, Akbi, Hamdane, Abdessamed, Anes
Format: Article
Language:English
Subjects:
Cellulose esters
Cellulose nitrate
Curing
Elastomers
Energetic materials
Fireworks
Fourier transforms
FTIR
Gas generators
Hexamethylene diisocyanate
Infrared spectroscopy
Investigations
Kinetics
nitrocellulose
Polyesters
Polyesterurethane
Polymer blends
polymerization
polyurethane
Polyurethane resins
Prepolymers
Reaction time
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Summary:Polyester (HTPS) based polyurethane (PU) elastomers were currently established to be effective binders for high‐energy composites with improved performances. Conventional PU binders are mostly non‐energetic materials, and consequently reduce the energy performance significantly. Nitrocellulose (NC), is an energetic polymer widely used as an ingredient in propellants, explosives, fireworks, and gas generators, it may be introduced in PU‐based compositions to overcome their performance drawback. Kinetic parameters must be specified in order to build PU binders with the most convenient and appropriate features. Therefore, the cure kinetics of polyester based polyurethane binder systems were investigated by Fourier transform infrared spectroscopy (FT‐IR) isothermal method. The polyester prepolymer (Desmophen® 1200) was cured with hexamethylene diisocyanate (HDI: Desmodur® N100) at various molar ratios (R[NCO]/[OH] = 0.6, 1, 1.25, and 1.5) and under different isothermal conditions (T = 60°C, 80°C, 100°C, and 120°C). In addition, the effect of the addition of nitrocellulose on the kinetics of polymerization of PU was investigated. The progression of the reaction was followed based on the decrease of the peak intensity of –NCO group at 2271 cm−1 as a function of the reaction time. The curing kinetic model and the apparent activation energy (Eα) were determined by the use of Kamal autocatalytic model and Friedman isoconversional method, respectively.
ISSN:0538-8066
1097-4601
DOI:10.1002/kin.21616