Effect of polyhedral oligomeric silsesquioxane on combustion performance of HTPB propellants

Ren, Jiaqi; Shi, Han; Du, Hanying; Li, Jianmin; Yang, Rongjie

doi:10.1016/j.combustflame.2021.111856

Cited by 15 publications

(4 citation statements)

References 11 publications

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“…Ren et al used POSS nanostructures as a burning rate catalyst in HTPB-based composite solid propellant and observed positive effects on its burning rate. They attributed this phenomenon to the active sites and large surface area of these nanostructures [32]. The results of this experiment show that POSS reduces the Ea of urethane bond formation and increases their rate constant.…”

Section: Mechanism Of Poss Effect On Reaction Kineticsmentioning

confidence: 74%

Mechanism of Effect of Non-Reactive Polyhedral Oligomeric Silsesquioxane Nanostructures on HTPB-Based Polyurethane Network Formation: A Rheokinetic Analysis

Moein,

Kebritchi

2023

Preprint

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This study explored the influence of non-reactive POSS nanostructures (Octa isobutyl silsesquioxane (OIBS) and Octa phenyl silsesquioxane (OPS)) on polyurethane (PU) from Hydroxyl-terminated polybutadiene (HTPB) resin and various curing agents (Toluene diisocyanate (TDI), Hexamethylene diisocyanate (HDI), Isophorone diisocyanate (IPDI), and Dimeryl-diisocyanate (DDI)). Contrary to previous expectations, POSS nanostructures enhanced the initial viscosity of HTPB resin. The Chemo-rheological method and Arrhenius and Eyring equations were employed to determine the reaction kinetics of PU synthesis. It was found that POSS nanostructures modulated the reaction kinetics between isocyanate and diol depending on the curing agent and POSS type. For instance, POSS accelerated the reaction in IPDI and TDI systems but slowed it down in the DDI system. In the HDI system, the POSS effect varied with its type and concentration, which were analyzed in detail. Besides the type of POSS, the nanostructure concentration also affected the PU synthesis's kinetics. Different concentrations of OIBS and OPS in each system were compared, and the possible reasons for the observed patterns were discussed. These results were explained by considering the interactions between POSS nanostructures and PU components. A plausible mechanism for the role of non-reactive POSS in PU synthesis kinetics was proposed.

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Section: Mechanism Of Poss Effect On Reaction Kineticsmentioning

confidence: 74%

Mechanism of Effect of Non-Reactive Polyhedral Oligomeric Silsesquioxane Nanostructures on HTPB-Based Polyurethane Network Formation: A Rheokinetic Analysis

Moein,

Kebritchi

2023

Preprint

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“…I sincerely appreciate both of them for their tireless efforts and generous contributions. 4 Availability of data and material: All data on demand…”

Section: Declarationsmentioning

confidence: 99%

“…For example, Kim et al found that reactive POSS increased the mechanical strength of HTPB, while nonreactive POSS increased the elongation of HTPB [3]. Ren et al reported that energetic and neutral POSS acted as burning rate catalysts for HTPB-based HECs, but did not explain how POSS in uenced the combustion process [4]. Therefore, there is a need to explore the effect of different types of POSS on the mechanical and combustion properties of HTPB-based HECs and to elucidate the mechanisms behind the observed phenomena.…”

Section: Introductionmentioning

confidence: 99%

Modification of Combustion Performance and Mechanical Properties of HTPB-Based High-Energy Composites with Non- Reactive Polyhedral Oligomeric Silsesquioxane Nanostructures

Moein,

Kebritchi

2023

Preprint

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This research effort was aimed at elucidating the effect of Octa-isobutyl-silsesquioxane (OIBS) and Octa-phenyl-silsesquioxane (OPS) nanostructures on the mechanical and Combustion Performance of Hydroxyl-terminated polybutadiene (HTPB) High-energy composites (HECs). This research included the investigation of mechanical properties in different concentrations of 0.1, 0.5, 1.5, and 2.5 wt% of Polyhedral Oligomeric Silsesquioxane (POSS). It should be noted that in the concentration of 0.1 wt% of POSS, elongation was observed along with a decrease in the mechanical strength of the composite On the contrary, with increasing concentration from 0.1 to 2.5 wt%, an increase in mechanical strength occurred. These findings were more pronounced for OPS than OBS. In addition, the combustion performance of HEC mixed with 0.5 wt% POSS was evaluated. Then the original samples, these nanostructures showed an increase in the burning rate of the sample. Significantly, the burning rate of HECs containing OIBS exceeded that of OPS. Findings obtained through XRD (X-ray Diffraction) and SEM (Scanning Electron Microscopy) analysis proved that POSS nanostructures increase the performance and combustion efficiency of HECs. In conclusion, a mechanism was proposed to improve the mechanical and combustion properties of HECs by POSS nanostructures distributed in the composite matrix.

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“…Octaphenylsilsesquioxane (OPS) is an important member of the polyhedral oligomeric phenylsilsesquioxane (POSS) family, which has attracted much attention due to its excellent thermal stability properties. − However, the chemical inertness and low solubility in most organic solvents of OPS restrict its broader application. , Over the last two decades, OPS modified by a variety of groups has been reported, such as nitrated octa(phenyl)silsesquioxane (NO 2 -OPS), , aminated octa(phenyl)silsesquioxane (NH 2 -OPS), , octadiphenylsulfonylsilsesquioxane (ODPSS), octamethyldiphenylsulfonylsilsesquioxane (OMDPSS), , and polycarboxyl octaphenylsilsesquioxanes . ODPSS and OMDPSS improved the solubility of OPS by 400 and 3000 times in dichloromethane, respectively.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Sulfonated Phenylsilsesquioxanes Guided by Machine Learning

Zhang,

Gu,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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Sulfonated octaphenylsilsesquioxane (SPOSS) has garnered significant interest due to its unique structural properties of containing the −SO 3 H group and its wide range of applications. This study introduces a novel approach to the synthesis of SPOSS, leveraging machine learning algorithms to explore new recipes and achieve higher −SO 3 H functionality. The focus was on synthesizing SPOSS with 2, 4, 6, and 8-SO 3 H functional groups on the phenyl group, marked as SPOSS-2, SPOSS-4, SPOSS-6, and SPOSS-8, respectively. The successful synthesis of SPOSS-8 was achieved by 5 training outputs based on the recipes of 21 sets of low-functionality (<4) SPOSS. The structure of SPOSS was confirmed using Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and time-of-flight mass spectrometry (MALDI-TOF MS). Machine learning analysis revealed that K 2 SO 4 is an important additive to improve the functionality of SPOSS. A synthetic mechanism was proposed and validated that K 2 SO 4 participated in the reaction to generate sulfur trioxide (SO 3 ), a sulfonating agent with high reactivity. SPOSS shows thermal stability superior to octaphenylsilsesquioxane (OPS) according to thermogravimetric analysis (TGA) and TG-FTIR.

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Effect of polyhedral oligomeric silsesquioxane on combustion performance of HTPB propellants

Cited by 15 publications

References 11 publications

Mechanism of Effect of Non-Reactive Polyhedral Oligomeric Silsesquioxane Nanostructures on HTPB-Based Polyurethane Network Formation: A Rheokinetic Analysis

Mechanism of Effect of Non-Reactive Polyhedral Oligomeric Silsesquioxane Nanostructures on HTPB-Based Polyurethane Network Formation: A Rheokinetic Analysis

Modification of Combustion Performance and Mechanical Properties of HTPB-Based High-Energy Composites with Non- Reactive Polyhedral Oligomeric Silsesquioxane Nanostructures

Synthesis of Sulfonated Phenylsilsesquioxanes Guided by Machine Learning

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