Kinetic Research on the Curing Reaction of Hydroxyl-Terminated Polybutadiene Based Polyurethane Binder System via FT-IR Measurements

Guo, Jiahu; Chai, Tianyou; Liu, Yucun; Cui, Jianlan; Ma, Hongan; Sang, Jing; Zhong, Lijin; Qin, Shengdong; Wang, Guodong; Ren, Xuefei

doi:10.3390/coatings8050175

Cited by 28 publications

(18 citation statements)

References 25 publications

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“…Previous research [10][11][12][13][14][15][16][17][18][19][20] of the HTPB curing reaction kinetics focused on the effects of dibutyltin dilaurate (DBTDL), ferric acetylacetonate (FeAA), triphenyl bismuth (TPB) and tin 2-ethylhexanoate (TECH) on the HTPB/IPDI binder system. DBTDL exhibited a strong catalyzing effect on the reaction between isocyanate and alcohols, so-called a gel catalyst.…”

Section: Introductionmentioning

confidence: 99%

Curing Reaction Kinetics of the EHTPB-Based PBX Binder System and Its Mechanical Properties

et al. 2020

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In this research, differential scanning calorimetry (DSC) was employed to compare the curing reaction kinetics of the epoxidized hydroxyl terminated polybutadiene-isophorone diisocyanate (EHTPB-IPDI) and hydroxyl terminated polybutadiene-isophorone diisocyanate (HTPB-IPDI) binder systems. Glass transition temperature (Tg) and mechanical properties of the EHTPB-IPDI and HTPB-IPDI binder systems were determined using the DSC method and a universal testing machine, respectively. For the EHTPB-IPDI binder system, the change of viscosity during the curing process in the presence of dibutyltin silicate (DBTDL) and tin 2-ethylhexanoate (TECH) catalysts was studied, and the activation energy was estimated. The results show that the activation energies (Ea) of the curing reaction of the EHTPB-IPDI and HTPB-IPDI binder systems are 53.8 and 59.1 kJ·mol−1, respectively. While their average initial curing temperatures of the two systems are 178.2 and 189.5 °C, respectively. The EHTPB-IPDI binder system exhibits a higher reactivity. Compared with the HTPB-IPDI binder system, the Tg of the EHTPB-IPDI binder system is increased by 5 °C. Its tensile strength and tear strength are increased by 12% and 17%, respectively, while its elongation at break is reduced by 10%. Epoxy groups and isocyanates react to form oxazolidinones, thereby improving the mechanical properties and thermal stability of polyurethane materials. These differences indicate that the EHTPB-IPDI binder system has better thermal stability and mechanical properties. During the EHTPB-IPDI binder system’s curing process, the DBTDL catalyst may ensure a higher viscosity growth rate, indicating a better catalytic effect, consistent with the prediction results obtained using the non-isothermal kinetic analysis method.

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Section: Introductionmentioning

confidence: 99%

Curing Reaction Kinetics of the EHTPB-Based PBX Binder System and Its Mechanical Properties

et al. 2020

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“…Hydroxyl terminated polybutadiene (HTPB) is a telechelic liquid rubber with polybutadiene as the main chain and hydroxyl as the terminal, it is a most common type of polyol used to produce polyurethane (PU) [1]. This prepolymer have fine physical properties, such as low glass-transition temperature (Tg) and low viscosity [2]. Not only that HTPB reacts with isocyanates to form polyurethane elastomers also have good mechanical performance [3,4].…”

Section: Introductionmentioning

confidence: 99%

Catalyzed HTPB/HDI-Trimer Curing Reactions and Influence on Pot Life

et al. 2020

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In this research, rheokinetics is used to study the curing reaction of hydroxyl terminated polybutadiene (HTPB) and trimer of hexamethylene-1,6-diisocyanate (HDI-trimer) with 1,4-diazabicyclo[2.2.2]octane (DABCO) as catalyst under different catalyst mass fraction. The results show that the pot life of the system depends on the catalyst mass fraction in the binder system. Furthermore, with increased catalyst mass fraction, the fitting diagram obtained by plotting ln (viscosity) versus curing time shows a better linear relationship. Therefore, the amount of catalyst required to achieve a certain pot life can be calculated through the formula. It is worth mentioning that the applicable pot life equations are proposed in the paper. From the equations, we find that under isothermal curing conditions at 35 °C, when the mass fraction of DABCO was 0.216 wt.%, the pot life of the HTPB/HDI-trimer binder system reaches 4 h.

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“…It is found from the simulation results of curing reaction kinetics that the overall pre-exponential factor and activation energy for the curing reaction of the Bu-NENA plasticized binder system are significantly higher than those of the BDNPA/F plasticized binder system. These results further demonstrate that the curing reaction of the Bu-NENA plasticized binder system is faster, and its curing reaction rate is more obviously affected by reaction temperature [21]. The activation energy and pre-exponential factor of the binder system plasticized by BDNPA/F/Bu-NENA mixed plasticizer are between those of the binder systems plasticized with a single plasticizer.…”

Section: Kinetics Of Curing Reactionmentioning

confidence: 54%

Influences of Bu‐NENA and BDNPA/F Plasticizers on the Properties of Binder for High‐Energy NEPE Propellants

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Rong

Zhang

et al. 2021

Propellants Explo Pyrotec

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Desensitized energetic plasticizer (DEP) plays a crucial role in the properties of the binder, and thus can further influence the performances of desensitive Nitrate Ester Plasticized Polyether (NEPE) propellants, which represents the development direction of the next generation solid propellant composites. However, at present, a study on influencing mechanisms for curing properties of propellant binders at the atomic and molecular level was rarely reported. In the current study, based on the curing kinetics and mechanical properties of PET/N-100 binder, the influencing mechanism of the DEPs, BDNPA/F, and Bu-NENA, on the binder was determined by the Gaussian quantum chemical calculation and MD simulation at the chemical bond and polymer chain levels, as well as the characterizations of the curing network structure, glass transition temperature, and microphase separation of the binder system. The consistent results at both micro and macro levels offer important theoretical guidance for studying the structure-mechanism-performance relationship of propellant binder, as well as for exploring the strategies that can reveal the curing mechanism of the binder system in depth.

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Kinetic Research on the Curing Reaction of Hydroxyl-Terminated Polybutadiene Based Polyurethane Binder System via FT-IR Measurements

Cited by 28 publications

References 25 publications

Curing Reaction Kinetics of the EHTPB-Based PBX Binder System and Its Mechanical Properties

Curing Reaction Kinetics of the EHTPB-Based PBX Binder System and Its Mechanical Properties

Catalyzed HTPB/HDI-Trimer Curing Reactions and Influence on Pot Life

Influences of Bu‐NENA and BDNPA/F Plasticizers on the Properties of Binder for High‐Energy NEPE Propellants

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