Fluorinated poly(1,3,4-oxadiazole-ether)s. Thermooxidative stability and kinetic studies

Ipate, Alina-Mirela; Hamciuc, Corneliu; Lisă, Gabriela

doi:10.1016/j.tca.2014.04.011

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…This isoconversion method is presented in detail in the literature [26,28,29,30,31,32] and allows the determination of the activation energy variation with the conversion degree, of the pre-exponential factor and of the functions f(µ) or g(µ).…”

Section: Methodsmentioning

confidence: 99%

Conversion of Plaster Molds Wastes Into the New Inorganic Products by Thermal Dehydration

Lazar,

Lisa,

Soreanu

et al. 2023

Ecology & Safety

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Solving the environmental issues by reducing the waste generated by the industries of building and ceramic materials is a global priority due to their impact on the human health and ecosystems. Recovery of plaster molds wastes from fine ceramic industry is an important topic to address in order to reduce the use of natural gypsum resources and address environmental issues generated by solid wastes from landfill disposal. The main objective of this paper is related to the thermal behaviour study of the calcium sulphate dehydrate during the calcination and to determine the kinetic parameters for the dehydration reactions. Also, the effects of different heating rates on the course of dehydration are investigated, pointing out that the general state of dehydration does not change, although at a given temperature the mass loss is the same for different heating rate. On the other hand, the increase in the heating rate displaces the reaction towards high temperatures. Thus, based on the kinetic study carried out, it was established that the dehydration process needs to take place approximately 50 minutes at a constant temperature of 373 K. Finally, the dehydrated waste is used to obtain a new inorganic material, which can be used for geopolymer preparation. For geopolymeric mortar, 5 % and 10 % from fly ash was replaced with gypsum. The solutions of NaOH 5M and sodium silicate were used to activate the geopolymer. The obtained results indicated a good geopolymer structure formation.

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Section: Methodsmentioning

confidence: 99%

Conversion of Plaster Molds Wastes Into the New Inorganic Products by Thermal Dehydration

Lazar,

Lisa,

Soreanu

et al. 2023

Ecology & Safety

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show abstract

“…25 Conventional low-temperature polymerization method is laborious and gives rise to a low polymerization degree and a single composition. 26 Additionally, high cost of raw materials limits the widespread production of PODs. Chemical modifications through chain extenders have been attempted to adjust the polymer chain structure and reduce rigidity.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of modified POD membranes with ultra-high tensile strength through hydrogen bonding functioning and copolymerization

Huang,

Li,

Xie

et al. 2023

High Performance Polymers

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A series of modified aromatic oxadiazole polymers were synthesized via condensation reactions of terephthalic dihydrazide (TPH) and varying amounts of Trimesic acid (H3BTC) in polyphosphoric acid (PPA). Pentaerythritol was introduced to construct intermolecular hydrogen bonds among polymeric chains, resulting in a three-dimensional network structure, and correlations between H-bonds and mechanic properties are discussed. Structures and mechanic properties of the polymers were characterized and analyzed. By investigation of molecular structure and membrane formation process of chemically modified and hydrogen bond-regulated polymer membranes, it was found that the modified polymer membranes retain the unique thermal stability, chemical stability, and good hydrophobicity of the POD rigid polymer. Additionally, hydrogen bonds not only significantly improve the overall quality of the membrane, but also play an important role in enhancing the mechanical properties of the membrane, as demonstrated in the highest observed of up to a maximum of 167.19 MPa. Furthermore, impact of H3BCT modification on light absorption and fluorescence performance of T-PODx is also analyzed and discussed in this paper.

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“…Thus, many researchers have focused on the study to improve the toughness of BMI resins. [1][2][3][4] Numerous approaches have been developed to improve the toughness of BMI resins, such as the synthesis of novel BMI monomers with tailored molecular structure, [5][6][7][8][9] copolymerization with allyl-terminated copolymers or aromatic diamines, [10][11][12][13][14] blending modification with thermoplastic resins or liquid crystalline compounds, and so on, [15][16][17][18][19] These methods can improve the toughness of BMI resins with a sacrificing of the thermal stability of resultant materials. 20 O,O -diallyl bisphenol A (DABPA) modified BMI resin systems, whose prepolymers have lower softening point and higher solubility, have been developed successfully.…”

mentioning

confidence: 99%

Novel Bismaleimide Resins Modified by Allyl Compound Containing Liquid Crystalline Structure

Wang

Chen

et al. 2016

Adv Polym Technol

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ABSTRACT:A novel allyl compound containing liquid crystalline structure, i.e., 4,4'-bis(4-allyloxy benzoic acid) phenyl ester (BAOBE), was synthesized. The chemical structure of BAOBE was characterized by Fourier transform infrared (FTIR) spectroscopy and 1 H NMR spectra, and the liquid crystalline properties were confirmed by polarized optical microscopy (POM). Besides, a series of modified bismaleimide (BMI) resins were prepared based on N,N -4,4 -bismaleimidodiphenylmethylene (BDM), BAOBE, and O,O'-diallyl bisphenol A (DABPA). The results of thermogravimetric analysis (TGA) indicate that the modified resins have excellent thermal stability with the highest temperatures for 5% weight loss above 438°C. The results of dynamic mechanical analysis (DMA) suggest that the glass transition temperature (T g ) of the modified resins are above 280°C. Besides, the introduction of BAOBE leads to a significant improvement in the flexural and impact properties of the modified BMI resins. Compared with the resin with only DABPA as a modifier, the highest flexural and impact strength can reach 156.2 MPa and 15.6 kJ/m 2 , increased by 19.2% and 90.2%, respectively. C

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Fluorinated poly(1,3,4-oxadiazole-ether)s. Thermooxidative stability and kinetic studies

Cited by 6 publications

References 29 publications

Conversion of Plaster Molds Wastes Into the New Inorganic Products by Thermal Dehydration

Conversion of Plaster Molds Wastes Into the New Inorganic Products by Thermal Dehydration

Fabrication and characterization of modified POD membranes with ultra-high tensile strength through hydrogen bonding functioning and copolymerization

Novel Bismaleimide Resins Modified by Allyl Compound Containing Liquid Crystalline Structure

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