Investigation on the thermal decomposition of hydroxyl terminated polyether based polyurethanes with inert and energetic plasticizers by DSC-TG-MS-FTIR

Ou, Yapeng; Sun, Yalun; Guo, Xueyong; Jiao, Qingze

doi:10.1016/j.jaap.2018.03.011

Cited by 41 publications

(24 citation statements)

References 40 publications

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“…In addition, the sequence of T g for all samples ranked as CB-b > CB-bt > CB-t > CB > C, indicating the degrees of difference in terms of the impact on the matrix molecular interaction by cross-linkers. T g of the mixture is influenced by multiple factors, such as molecular weight [52], intermolecular interaction [53], compound compatibility [54], etc. Based on the complicated microcosmic matrix situation induced by different cross-linking methods, much more work is still needed to clarify such a thermo dynamic phenomenon.…”

Section: Resultsmentioning

confidence: 99%

The Impact of Cross-linking Mode on the Physical and Antimicrobial Properties of a Chitosan/Bacterial Cellulose Composite

2019

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The bacteriostatic performance of a chitosan film is closely related to its ionic and physical properties, which are significantly influenced by the mode of cross-linking. In the current work, chitosan with or without bacterial cellulose was cross-linked with borate, tripolyphosphate, or the mixture of borate and tripolyphosphate, and the composite films were obtained by a casting of dispersion. Mechanical measurements indicated that different modes of cross-linking led to varying degrees of film strength and elongation increases, while the films treated with the borate and tripolyphosphate mixture showed the best performance. Meanwhile, changes in the fractured sectional images showed a densified texture induced by cross-linkers, especially for the borate and tripolyphosphate mixture. Measurements of Fourier transform infrared showed the enhanced interaction between the matrix polymers treated by borate, confirmed by a slight increase in the glass transitional temperature and a higher surface hydrophobicity. However, the reduced antimicrobial efficiency of composite films against E. coli, B. cinerea, and S. cerevisiae was obtained in cross-linked films compared with chitosan/bacterial cellulose films, indicating that the impact on the antimicrobial function of chitosan is a noteworthy issue for cross-linking.

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Section: Resultsmentioning

confidence: 99%

The Impact of Cross-linking Mode on the Physical and Antimicrobial Properties of a Chitosan/Bacterial Cellulose Composite

2019

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“…Initial decomposition occurs at about 150 °C, and the terminal temperature of the first thermal decomposition process is 240 °C. The mass loss of in this process is about 90 %, mainly owing to the volatilization and thermal decomposition of plasticizer BDNPA/F and the thermal decomposition of RDX with a lower decomposition temperature . The temperature range for the second step of thermal decomposition is from 240–400 °C and the mass loss of this process is about 10 %, which corresponds to the thermal decomposition of the binder .…”

Section: Resultsmentioning

confidence: 93%

Combustion Properties of Composite Propellants Based on Two Kinds of Polyether Binders and Different Oxidizers

Gong

et al. 2020

Propellants Explo Pyrotec

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Two kinds of solid propellants based on propargyl-terminated ethylene oxide-tetrahydrofuran copolyether (PTPET) and ethylene oxide-tetrahydrofuran copolyether (PET) were prepared with 1,3,5-trinitro-1,3,5triazacyclohexane (RDX), ammonium perchlorate (AP) and aluminum (Al), respectively. The order of burning rates for PET + RDX, PTPET + RDX and PET + RDX + CuÀ B propellants: PTPET + RDX > PET + RDX > PET + RDX + CuÀ B. Their pressure exponents are also similar when the pressure is higher than 7 MPa. The combustion residue of PET + RDX and PET + RDX + CuÀ B propellants show a loose structure and there are many bright particles distributed in its flame zone. The combustion residue of PTPET + RDX propellant shows a dense structure and its flame is uniform. The burning rates of PET + AP + CuÀ B propellant is between the burning rates of PET + AP and PTPET + AP propellants at the same pressure. Their flame shape is similar. The burning rates of PET + AP + Al + CuÀ B propellant is also between the burning rates of PET + AP + Al and PTPET + AP + Al propellants at the same pressure. The combustion flame of PET + AP + Al propellant differs greatly in direction and shape at different time. The combustion flame of PTPET + AP + Al and PET + AP + Al + CuÀ B become almost identical in shape and direction at different time. These results show that the curing catalyst CuÀ B of PTPET propellant plays a catalytic role in combustion.

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“…The details about the connection could be taken in Ref. [ 26 ]. NGO was tested from room temperature to 360 °C under an argon atmosphere at a heating rate of 20 °C·min −1 in simultaneous thermal analysis.…”

Section: Methodsmentioning

confidence: 99%

“…Combined with the measurements of infrared spectroscopy (IR) and gas chromatography (GC) or mass spectrum (MS) for analyzing the gaseous products, the process of decomposition can be initially explored. Multi-apparatus combination as DSC-TG-MS-FTIR attracts increasing interest due to its synchronous analysis of gaseous products for improving accuracy compared to an individual combination [25][26][27]. In this paper, DSC-TG-MS-FTIR synchronous measurement is an assembly of NETZSCH (Bayern, Germany) STA449C, NETZSCH QMS403C and BRUKER (Karlsruhe, Germany) VERTEX 70, and two pipelines are connected with DSC/TG measurements to MS apparatus and FTIR apparatus separately as shown in Figure S1.…”

Section: Thermal Analysismentioning

confidence: 99%

Nitrated Graphene Oxide Derived from Graphite Oxide: A Promising Energetic Two-Dimensional Material

Guan

Ren

Yu³

et al. 2020

Nanomaterials

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In order to synthesize a novel two-dimensional energetic material, nitrated graphene oxide (NGO) was prepared by the nitrification of graphite oxide to make a functional modification. Based on the morphological characterization, the NGO has a greater degree of curl and more wrinkles on the surface. The structure characterization and density functional theory calculation prove that epoxy and hydroxyl groups on the edge of graphite oxide have reacted with nitronium cation (NO2+) to produce nitro and nitrate groups. Hydrophobicity of NGO implied higher stability in storage than graphene oxide. Synchronous simultaneous analysis was used to explore the decomposition mechanism of NGO preliminarily. The decomposition enthalpy of NGO is 662.0 J·g−1 and the activation energy is 166.5 kJ·mol−1. The thermal stability is similar to that of general nitrate energetic materials. The hygroscopicity, thermal stability and flammability of NGO prove that it is a novel two-dimensional material with potential applications as energetic additives in the catalyst, electrode materials and energetic devices.

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Investigation on the thermal decomposition of hydroxyl terminated polyether based polyurethanes with inert and energetic plasticizers by DSC-TG-MS-FTIR

Cited by 41 publications

References 40 publications

The Impact of Cross-linking Mode on the Physical and Antimicrobial Properties of a Chitosan/Bacterial Cellulose Composite

The Impact of Cross-linking Mode on the Physical and Antimicrobial Properties of a Chitosan/Bacterial Cellulose Composite

Combustion Properties of Composite Propellants Based on Two Kinds of Polyether Binders and Different Oxidizers

Nitrated Graphene Oxide Derived from Graphite Oxide: A Promising Energetic Two-Dimensional Material

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