Thermochimica Acta最新文献_第3页

A novel phosphoryl imidazolate flame retardant for polyester-cotton blend fabrics: Flame retardancy, thermal behavior and mechanical properties 一种新型咪唑磷基涤棉混纺织物阻燃剂：阻燃性能、热性能和力学性能

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-27 DOI: 10.1016/j.tca.2025.179991

Xiaoyun Zhang, Ping Li, Zhanna Liu, Huaifang Wang, Ping Zhu

{"title":"A novel phosphoryl imidazolate flame retardant for polyester-cotton blend fabrics: Flame retardancy, thermal behavior and mechanical properties","authors":"Xiaoyun Zhang, Ping Li, Zhanna Liu, Huaifang Wang, Ping Zhu","doi":"10.1016/j.tca.2025.179991","DOIUrl":"10.1016/j.tca.2025.179991","url":null,"abstract":"<div><div>Inspired by the disperse dye in thermosol dyeing for polyester and polyester- containing fabrics, a novel small-molecule phosphoryl imidazolate compound with phosphorus, nitrogen, and heterocyclic aromatic structure, 2-(1H-imidazol-1-yl)-5,5-dimethyl-1,3,2-dioxaphosphinane-2-oxide (DOPIM), was successfully synthesized and utilized to enhance the flame retardancy of polyester-cotton blend (PTCO) fabrics through a convenient dip-dry-cure (PDC) strategy. The FTIR and NMR were employed to detect the chemical structure of DOPIM. Furthermore, to investigate the enhancement of PTCO's flame retardancy by integration of DOPIM, the thermal stability, flammability, combustion behavior and physical properties of the samples were comprehensively assessed. The char residues of the treated PTCO in the nitrogen atmosphere increased to 12.86 % from 2.90 % of the PTCO at 700 °C. The DOPIM treated PTCO exhibited a LOI of 28.7 % and exceptional self-extinguishing performance, with a damage length of 36 mm. The PHRR and THR of the DOPIM-treated PTCO decreased by 33 % and 32 %. TG, CCT and TG-FTIR analysis of PTCO, along with other test results demonstrated that DOPIM not only facilitated the degradation and char formation of cotton fibers, reducing their flammability, but also significantly reduced the degradation rate of polyester fibers. The presence of char and nonflammable gases generated from both the cotton and DOPIM contributed to form a stable char in PTCO. This indicates that DOPIM effectively worked for both cotton and polyester, enhancing the overall fire resistance of the PTCO. Notably, the DOPIM had no significant negative effect on the mechanical properties, handle and whiteness of the PTCO. In summary, this work offered a convenient and effective method for fabricated fire-safety PTCO, which holds significant importance in safeguarding life and property.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 179991"},"PeriodicalIF":3.1,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insight of biopolymeric degradation and kinetic triplets of corn cob and its biochar using thermogravimetric analysis 用热重分析法研究玉米芯及其生物炭的生物聚合物降解和动力学三重体

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-27 DOI: 10.1016/j.tca.2025.179990

Harsha Wakudkar, Parmanand Sahu

引用次数: 0

Exploring the thermal transformations of glucosamine-functionalized graphene oxide aimed at controlled fabrication of polycrystalline ceramic-graphene composites 探索氨基功能化氧化石墨烯的热转化，以控制制备多晶陶瓷-石墨烯复合材料

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-26 DOI: 10.1016/j.tca.2025.179987

Piotr Wiecinski , Anna Wieclaw-Midor , Michal Kukielski , Artur Kasprzak , Joanna Tanska , Blanka Seredynska , Paulina Wiecinska

{"title":"Exploring the thermal transformations of glucosamine-functionalized graphene oxide aimed at controlled fabrication of polycrystalline ceramic-graphene composites","authors":"Piotr Wiecinski , Anna Wieclaw-Midor , Michal Kukielski , Artur Kasprzak , Joanna Tanska , Blanka Seredynska , Paulina Wiecinska","doi":"10.1016/j.tca.2025.179987","DOIUrl":"10.1016/j.tca.2025.179987","url":null,"abstract":"<div><div>Graphene oxide is commonly used as a precursor to graphene in ceramic-matrix composites, as it can be thermally reduced to reduced graphene oxide (r-GO) at much lower temperatures than those required for sintering of the ceramic materials. In wet forming methods, dispersibility of graphene oxide in aqueous medium can be enhanced through surface modification. In this study, thermogravimetry and differential thermal analysis coupled to mass spectrometry (TG/DTA-MS) were applied to analyze the thermal transformations of glucosamine-functionalized graphene oxide (GO) compared to non-functionalized GO, both of which are key components in the fabrication of ceramic-graphene composites. Measurements were conducted under two different atmospheres: air and argon, to assess the influence of oxidative and inert environments on thermal stability and decomposition processes. Mass spectrometry (MS) enabled the identification of gaseous by-products released during decomposition. The combined TG/DTA-MS technique provided valuable insights into the thermal stability, volatile emissions, and potential environmental impact of the analyzed samples. The paper also describes the advances in thermal analysis, showing the wide range of programming possibilities and sample loading. This integrated approach is essential for optimizing the sintering process of composite materials, exemplified by ZrO₂-graphene composites. Additionally, the paper highlights several applications of TG-MS in ceramics manufacturing, including additive manufacturing and colloidal processing. The different possibilities of measurement data processing are also presented.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 179987"},"PeriodicalIF":3.1,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oxidation and exothermic characteristics of particulate coal under water-immersion air‒drying and pre-oxidation effects 浸水风干和预氧化作用下颗粒煤的氧化和放热特性

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-25 DOI: 10.1016/j.tca.2025.179986

Jiangkun Chao , Tao Wei , Ling Shen , Daimin Hu , Rongkun Pan , Xuefeng Han , Shuo Wei

引用次数: 0

Fire-resistant degradation mechanism of polyvinyl chloride cable sheaths exposed to different accelerated ageing conditions 不同加速老化条件下聚氯乙烯电缆护套耐火退化机理研究

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-19 DOI: 10.1016/j.tca.2025.179983

Hui Liu, Wenqiang Wang, Long Yan, Zhisheng Xu

引用次数: 0

DSC to explore activation energy landscape of glass relaxation DSC探索玻璃弛豫的活化能景观

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-15 DOI: 10.1016/j.tca.2025.179985

Sergey Vyazovkin

{"title":"DSC to explore activation energy landscape of glass relaxation","authors":"Sergey Vyazovkin","doi":"10.1016/j.tca.2025.179985","DOIUrl":"10.1016/j.tca.2025.179985","url":null,"abstract":"<div><div>This review paper discusses the methods of estimating the activation energy of the glass relaxation from DSC experiments that include heating through the glass transition, short time annealing (physical aging) far below <em>T<sub>g</sub></em>, and annealing into equilibrium just below <em>T<sub>g</sub></em>. Isoconversional analysis of the data obtained on heating through the glass transition yields large (hundreds kJ/mol) activation energy that decreases with increasing temperature as expected for the alpha relaxation. Short time annealing runs conducted around 0.8<em>T<sub>g</sub></em> give rise to small (tens kJ/mol) activation energies, whose values are similar to those of the beta relaxation. Increasing the annealing temperature in the region 0.8<em>T<sub>g</sub></em> – <em>T<sub>g</sub></em> causes the activation energy to rise toward the values characteristic of the alpha relaxation that suggests that the overall relaxation in the respective temperature region is driven by the mixed dynamics that comprises the alpha and beta processes. As temperature rises from well below to well above <em>T<sub>g</sub></em> the activation energy passes through a maximum around <em>T<sub>g</sub></em>. The mixed relaxation dynamics is also observed on annealing into equilibrium that demonstrates that with the progress of relaxation the activation energy increases between the values characteristic of the beta and alpha relaxation.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 179985"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Isoconversional kinetic analysis of bisphenol A benzoxazine cure 双酚A型苯并恶嗪固化的等转化动力学分析

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-15 DOI: 10.1016/j.tca.2025.179984

Vyacheslav V. Shutov, Ekaterina A. Gorbunova, Irina Yu. Gorbunova, Igor S. Sirotin

引用次数: 0

Thermal parameter investigation of nanocrystalline BN particles under the neutron irradiation 中子辐照下纳米晶BN颗粒的热参数研究

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-15 DOI: 10.1016/j.tca.2025.179982

Elchin M. Huseynov , Tural G. Naghiyev , Nijat R. Abbasov

{"title":"Thermal parameter investigation of nanocrystalline BN particles under the neutron irradiation","authors":"Elchin M. Huseynov , Tural G. Naghiyev , Nijat R. Abbasov","doi":"10.1016/j.tca.2025.179982","DOIUrl":"10.1016/j.tca.2025.179982","url":null,"abstract":"<div><div>The thermal properties of nanocrystalline boron nitride (BN) particles are crucial for their use in high-temperature and radiation-resistant applications. However, the effects of neutron irradiation on these properties remain poorly understood. This study aims to investigate the thermal behavior of nanocrystalline BN particles before and after exposure to neutron irradiation, with a focus on changes in key thermo-physical parameters. To achieve this, we employed differential scanning calorimetry (DSC) to determine the Gibbs free energy of BN nanoparticles across a temperature range of 300 K to 1270 K. Differential thermal analysis (DTA) was also used to examine phase transitions and potential amorphization processes that occur in the particles post-irradiation. Both enthalpy and entropy were calculated for the nanocrystalline BN system before and after neutron irradiation, with the results supported by theoretical models. Our findings reveal significant changes in the thermal properties of BN nanoparticles induced by neutron irradiation, including shifts in phase behavior and alterations in the thermodynamic parameters. These results provide a deeper understanding of the material's behavior under neutron irradiation, which is critical for optimizing the use of BN in nuclear and other high-radiation environments.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 179982"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of gas phase products and free radical formation mechanism in anthracite spontaneous combustion process 无烟煤自燃过程气相产物及自由基形成机理分析

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-14 DOI: 10.1016/j.tca.2025.179981

Dan Zhao , Yumo Wu , Jinzhang Jia

{"title":"Analysis of gas phase products and free radical formation mechanism in anthracite spontaneous combustion process","authors":"Dan Zhao , Yumo Wu , Jinzhang Jia","doi":"10.1016/j.tca.2025.179981","DOIUrl":"10.1016/j.tca.2025.179981","url":null,"abstract":"<div><div>Understanding the microstructure of coal is fundamental to elucidating the reaction pathways involved in spontaneous combustion. In this study, we employed simultaneous thermal analysis (TG-DSC), thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR), in-situ FTIR, and EPR(Electron Paramagnetic Resonance) to investigate the combustion behavior of anthracite. A molecular model for anthracite (C<sub>200</sub>H<sub>132</sub>O<sub>14</sub>N<sub>2</sub>S<sub>1</sub>) was developed through characterization and analytical experiments, followed by ReaxFF molecular dynamics simulations of combustion at varying temperatures. The results indicate that the oxidation reactions of active functional groups serve as the primary contributor to the oxidation and thermal storage processes of anthracite. The sequence of gas phase products generation is H<sub>2</sub>O > CO<sub>2</sub> > CO, with CO<sub>2</sub> being produced in the highest quantity, followed by H<sub>2</sub>O, while CO is generated in the least amount. Furthermore, the reaction pathways for gas phase products are significantly influenced by free radicals such as ·CHO, ·HO, and ·H.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 179981"},"PeriodicalIF":3.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Henkin-McGill critical temperature test for explosives revisited: An overview of historical and modern method development 重访炸药的亨金-麦吉尔临界温度试验：历史和现代方法发展的概述

IF 3.1 2区化学

Thermochimica Acta Pub Date : 2025-03-10 DOI: 10.1016/j.tca.2025.179980

Jason J. Phillips

{"title":"The Henkin-McGill critical temperature test for explosives revisited: An overview of historical and modern method development","authors":"Jason J. Phillips","doi":"10.1016/j.tca.2025.179980","DOIUrl":"10.1016/j.tca.2025.179980","url":null,"abstract":"<div><div>Many overarching standards, regulations, or other requirements necessitate that the critical temperature (T<sub>crit</sub>) of an energetic material be known or estimate prior to operations such as heating. However, they rarely, if ever, provide a specific method for doing so. While other methods exist to calculate T<sub>crit</sub>, such as the Frank-Kamenetskii equation, computer simulation, etc., these cannot be readily utilized for energetics that are physical mixtures (i.e. most pyrotechnics) or materials where detailed material properties required for such calculations are lacking.</div><div>In this study, a COTS (commercial off-the-shelf) SBAT (Simulated Bulk Auto-ignition Test) apparatus is modified to perform Henkin cookoff tests. This creates a simple, efficient, and cost-effective solution to estimate required T<sub>crit</sub> values for energetic materials. After a historical overview of the evolution of the Henkin test, several common energetic materials (PETN, RDX, etc.) for which T<sub>crit</sub> has been readily calculated, and historical data is available, were analyzed for comparison and verification purposes. This was followed by a variety of pyrotechnic mixtures and other materials to where calculation methods cannot be readily used. The modified apparatus, as well as an updated sample shell sealing method, produced results that aligned well with historical data. It also produced reasonable T<sub>crit</sub> estimates for those materials where the Frank-Kamenetskii equation cannot be applied.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"748 ","pages":"Article 179980"},"PeriodicalIF":3.1,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0