Studying Crosslinker Chemical Structure Effect on the Tuning Properties of HTPB‐Based Polyurethane

Yarmohammadi, Masoud; Komeili, Saied; Shahidzadeh, Mansour

doi:10.1002/prep.201700180

Cited by 15 publications

(16 citation statements)

References 36 publications

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“…Results indicated that the largest concentration of cross-linkers produced more distributed segment segregation and higher thermal stability. Cross-linking process in PU could be carried out through various methods, wherein low-molecular-weight compounds with more than two reactive hydrogens were used as cross-linkers, such as trimethylolpropane (TMP) and triethanolamine (TEA) [ 23 , 24 , 25 ]. Moreover, rhodamine chromophores have advantages of long wavelengths of excitation (greater than 550 nm) and emission (590 nm), good photostability, and high fluorescent quantum yields.…”

Section: Introductionmentioning

confidence: 99%

A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

et al. 2020

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Rhodamine derivatives (RDs) with three reactive hydrogens were synthesized and well characterized by Fourier transform infra-red spectroscopy (FTIR), 1H nuclear magnetic resonance (1H NMR) and electrospray ionization mass spectra (ESI mass). Then, the obtained RD was covalently cross-linked into polyurethane (PU) matrix through chemical linkages to fabricate a network structure, and the fluorescent properties, mechanical properties, thermal stability, and emulsion particle size were systematically investigated. Results demonstrate that PU-RD maintains initial fluorescent properties and emits desirable yellow fluorescence under ultraviolet irradiation. Moreover, compared with linear PU without fluorescers, PU-RD shows clearly improved mechanical properties and thermal stability, on account of the formed network structures.

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Section: Introductionmentioning

confidence: 99%

A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

et al. 2020

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“…In continuation of our previous study on the properties of the energetic materials, a novel catalyst has been prepared for AP thermal decomposition. In this regard, the unique properties of the GO and catocene have been applied to one catalyst.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the catocene/graphene oxide nanocomposite catalytic activity on ammonium perchlorate thermal decomposition

Sa'at

Yarmohammadi

Pedram

et al. 2019

Int J of Chemical Kinetics

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A novel nanocomposite catalyst for thermal degradation of the ammonium perchlorate (AP) has been synthesized, and its effect on the thermal behavior of AP has been investigated. Preparation of the catalyst was carried out via functionalization of the graphene oxide with phenyl isocyanate and its noncovalent bonding to catocene. The catalytic activity of the catalyst was studied by thermal gravimetric analysis/differential scanning calorimetry at various heating rates. In addition, the effect of the catalyst on the AP thermal decomposition has been investigated by Kissinger and Friedman methods as two model‐free methods for calculation of the activation energy parameter. According to the Kissinger method calculations, the Ea of AP decomposition reduced about 151 kJ⋅mol−1 lower than the reported value for pure AP in the presence of the catalyst. Calculation of the Ea value for various reaction conversion rates by the Friedman method also confirmed the Kissinger method results.

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“…With the increment of the chemical cross‐linking in bonds, a decline in the thermal and mechanical properties of a corresponding polyurethane product is remarked as one of the direct effect of this material aging . Moreover, the presence of the allylic hydrogen atom with low association energy and type G hydroxyl groups has made HTPB a prospective substrate for radical oxidation reactions . On the other hand, thermal‐oxidation degradation is one of the most prominent problems in manufacturing of the polymeric products .…”

Section: Introductionmentioning

confidence: 99%

“…20 Moreover, the presence of the allylic hydrogen atom with low association energy and type G hydroxyl groups has made HTPB a prospective substrate for radical oxidation reactions. 21,22 On the other hand, thermaloxidation degradation is one of the most prominent problems in manufacturing of the polymeric products. 23 This process directly affects the aging and shelf life of the polymeric ingredients and products.…”

Section: Introductionmentioning

confidence: 99%

“…In continuation of our studies on HTPB and its elastomers, the antioxidant activity of A.O.2246 and 3‐hydroxy pyridines on HTPB resin is investigated to explore a substitution compound for A.O.2246. In this regard, a mixture of two antioxidants (1:1) was added to the HTPB resin and the thermal‐oxidative behavior of this mixture was evaluated by the simultaneous thermal analysis (STA) test Scheme .…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Nazmi

Yarmohammadi

Pedram

et al. 2018

Int J of Chemical Kinetics

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The effect of the mixture of two antioxidants has been evaluated on the thermal‐oxidant degradation of the hydroxyl‐terminated polybutadiene (HTPB) because of its importance in the coatings and adhesives industries. 2,2‐Methylene bis(4‐methyl‐6‐tertiarybutylphenol) or A.O.2246 and 3‐hydroxy pyridine have been considered as antioxidants in this study as a common HTPB antioxidant and an active antioxidant, respectively. The thermal‐oxidant degradation behavior of the HTPB has been investigated in the presence of a mixture of two antioxidants by TGA and DTG tests, and, subsequently, the results of these tests have been interpreted by two model‐free methods, e.g., Kissinger–Akahira–Sunose and Friedman methods. The results revealed that the mixture of two antioxidants affected the activation energy of the thermal‐oxidant degradation reaction of the HTPB. The calculated activation energy value obtained from the Kissinger–Akahira–Sunose method was about 199 ± 1 kJ⋅mol−1. In addition, the Ea value at various conversion rates has also been calculated by using the Friedman method. This method showed that the highest Ea value in the thermal‐oxidant degradation reaction belonged to the initiation step of the reaction (about 299 kJ⋅mol−1). Moreover, the lowest activation energy value was correlated to the second step of the degradation reaction at a conversion rate of 0.6 (about 184 kJ⋅mol−1).

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Studying Crosslinker Chemical Structure Effect on the Tuning Properties of HTPB‐Based Polyurethane

Cited by 15 publications

References 36 publications

A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

Evaluation of the catocene/graphene oxide nanocomposite catalytic activity on ammonium perchlorate thermal decomposition

Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

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