Thermochimica Acta最新文献_第10页

Performance evaluation approach for accelerating rate calorimeters by means of Joule heat 利用焦耳热对加速度热量计进行性能评估的方法

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-03-11 DOI: 10.1016/j.tca.2024.179719

Weixiang Liang , Zixin Ye , Dongfang Hu , Jinxin Xu , Juncheng Jiang , Thomas Fröhlich , Jiong Ding

引用次数: 0

Curing kinetics of composites based on benzoxazine resin and microcrystalline cellulose modified by phosphorus salt 基于苯并恶嗪树脂和磷盐改性微晶纤维素的复合材料的固化动力学

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-03-06 DOI: 10.1016/j.tca.2024.179718

Wissam Bessa , Djalal Trache , Chahinez Ghalmi , Sabrine Aidi , Ahmed Fouzi Tarchoun , Feriel Gahfif , Amir Abdelaziz , Sourbh Thakur , M. Hazwan Hussin

{"title":"Curing kinetics of composites based on benzoxazine resin and microcrystalline cellulose modified by phosphorus salt","authors":"Wissam Bessa , Djalal Trache , Chahinez Ghalmi , Sabrine Aidi , Ahmed Fouzi Tarchoun , Feriel Gahfif , Amir Abdelaziz , Sourbh Thakur , M. Hazwan Hussin","doi":"10.1016/j.tca.2024.179718","DOIUrl":"10.1016/j.tca.2024.179718","url":null,"abstract":"<div><p>A comprehensive investigation into the curing kinetics of composites based on bisphenol A aniline benzoxazine resin (BA-a) and microcrystalline cellulose (MCC) modified by phosphorylation (MCC-pH), was conducted in this study. For this purpose, differential scanning calorimetry (DSC) analysis, at different heating rates, was used to examine the curing process. The kinetic parameters as a function of conversion were determined using isoconversional approaches, i.e., iterative Kissinger-Akahira-Sunose (it-KAS), Trache-Abdelaziz-Siwani methodology (TAS), and Vyazovkin methodology. The incorporation of MCC-pH reduced considerably the curing temperatures, indicating their catalytic effect. A combination of isoconversional methods and multi-step kinetic fitting was done to elucidate the effect of adding MCC-pH on BA-a curing. The reported data exhibited the enhanced reactivity of the composite systems, which was associated with the acceleration of the regular polymerization reaction. The possible pathway of the polymerization in the presence of phosphorylated cellulose was also discussed.</p></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071325","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

Descriptors applicability in machine learning-assisted prediction of thermal decomposition temperatures for energetic materials: Insights from model evaluation and outlier analysis 描述符在机器学习辅助预测高能材料热分解温度中的适用性：模型评估和离群值分析的启示

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-03-06 DOI: 10.1016/j.tca.2024.179717

Zhixiang Zhang , Chao Chen , Yilin Cao , Linyuan Wen , Xiaokai He , Yingzhe Liu

引用次数: 0

Unraveling solidification pathways of pure elements by ultra-slow temperature vs. time profile measurements 通过超低温与时间曲线测量揭示纯元素的凝固路径

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-03-05 DOI: 10.1016/j.tca.2024.179716

Rajkumar V．B． , Ajeet K. Srivastav , Peisheng Wang , Yong Du

{"title":"Unraveling solidification pathways of pure elements by ultra-slow temperature vs. time profile measurements","authors":"Rajkumar V．B． , Ajeet K. Srivastav , Peisheng Wang , Yong Du","doi":"10.1016/j.tca.2024.179716","DOIUrl":"10.1016/j.tca.2024.179716","url":null,"abstract":"<div><p>This study delves into the phase transformations of fifteen pure elements utilizing a synergistic approach combining arc-melting, a pyrometer, and its temperature vs. time output. Employing cooling curve recording tactics during arc-melting with an elite temporal resolution pyrometer unravels double recalescence in refractory metals (‘Mo,’ ‘Nb,’ ‘Ta,’ ‘W’). Metalloids, including ’B,’ ’Si,’ and ’Ge,’ exhibit unique characteristics, with ’Si’ showcasing a gravity-defying protrusion along the temperature gradient. The pyrometer’s output for fcc (‘Ni,’ ‘Co’) and bcc (‘Hf,’ ‘Mo,’ etc.) primary solidifying phases is synonymous. Recalescence striations in the cooling graph depict a balance between factors favoring and impeding nucleation. In cases of ambiguous pyrometer signals, the implementation of an alternative approach enhances the quality of the temperature vs. time graph. In the future, a fresh contact method design concept in this study would address other pyrometer limitations, such as repeatability concerns and constant emissivity value usage in an entire experiment.</p></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071006","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

Targeted control of unsaturated polyester resin curing kinetics to enhance network regularity and achieve impressive improvement in mechanical properties using gamma-aluminia: Exploring the relationship between curing kinetics and mechanical properties 使用γ-铝有针对性地控制不饱和聚酯树脂的固化动力学，以增强网络的规整性并显著改善机械性能：探索固化动力学与机械性能之间的关系

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-02-16 DOI: 10.1016/j.tca.2024.179704

Elham Rouhi , Mehdi Poorabdollah , Kiumars Bahrami

{"title":"Targeted control of unsaturated polyester resin curing kinetics to enhance network regularity and achieve impressive improvement in mechanical properties using gamma-aluminia: Exploring the relationship between curing kinetics and mechanical properties","authors":"Elham Rouhi , Mehdi Poorabdollah , Kiumars Bahrami","doi":"10.1016/j.tca.2024.179704","DOIUrl":"https://doi.org/10.1016/j.tca.2024.179704","url":null,"abstract":"<div><p>In this study, gamma-alumina (γ-Al<sub>2</sub>O<sub>3</sub>) particles were used to create a regular and strong network of unsaturated polyester (UP) resins by controlling the targeted free radicals and proportional adsorption of alkyd chains. The composite exhibited 80 %, 42 %, 46.39 %, and 60.31 % increases in the storage modulus, toughness, tensile strength, and flexural strength, respectively, compared with the Neat UP resin. A simultaneous study of the mechanical and physical characteristics and curing kinetics showed that the significant improvement in the mechanical and physical characteristics of the UP/Al 1 composite was due to the increase in the network regularity resulting from the targeted control of free radicals by γ-Al<sub>2</sub>O<sub>3</sub> particles and the proportional adsorption of alkyd chains. The significant decrease in the values of K and E<sub>D</sub> (Vyazovkin–Sbirrazzuoli diffusion factor (D-factor)) for the UP/Al 1 composite (-22.8 and 27.7 kJ/mol, respectively) compared to that of the Neat UP resin (-9.4, and 40.3 kJ/mol, respectively) confirms a significant increase in network regularity resulting from γ-Al<sub>2</sub>O<sub>3</sub> particles.</p></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139907894","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

Butyric acid, putrescine and their mixture as potential fly attractants: Complexation, thermal analysis and volatility characterisation 作为潜在引蝇剂的丁酸、腐胺及其混合物：络合、热分析和挥发性表征

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-02-16 DOI: 10.1016/j.tca.2024.179707

Franco Pretorius, Elizabeth L. du Toit, Isbé van der Westhuizen, Maria T. Atanasova, Walter W Focke

{"title":"Butyric acid, putrescine and their mixture as potential fly attractants: Complexation, thermal analysis and volatility characterisation","authors":"Franco Pretorius, Elizabeth L. du Toit, Isbé van der Westhuizen, Maria T. Atanasova, Walter W Focke","doi":"10.1016/j.tca.2024.179707","DOIUrl":"https://doi.org/10.1016/j.tca.2024.179707","url":null,"abstract":"<div><p>Mixtures of butyric acid and putrescine form a crystalline amine carboxylate complex in a 2:1 molar ratio irrespective of the initial molar component mixture ratio. This was confirmed through X-ray diffraction, FTIR spectroscopy and elemental analyses. Thermogravimetric analyses proved this complex to be significantly less volatile than the pure constituent components. In thermogravimetric temperature scans, a 90% mass loss of the complex was achieved at 143.4 °C while the same level was achieved at 68.1 °C for both the pure putrescine and butyric acid. A gas permeability parameter Φ<em><sub>A</sub></em> = <em>M</em><sub>A</sub><em>D</em><sub>A</sub><em>P</em><sub>A</sub>/<em>RT</em> (g m<sup>–1</sup>s<sup>–1</sup>) was developed to quantitatively describe the volatility of the respective components through a stagnant gas layer. This parameter is a function of only material properties and temperature and adequately described the observed mass loss behaviour of pure components as well as the newly formed complex. In a preliminary field trial, mixtures of putrescine and butyric acid were less effective than pure putrescine for attracting flies. This can be attributed to the lower volatility of the putrescine/butyric acid complex and the subsequent suppression of the release rate of the active compounds.</p></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0040603124000467/pdfft?md5=cef07fae58227f0537463407937edfab&pid=1-s2.0-S0040603124000467-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139915077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct synthesis of porous aluminum nitride foams for enhancing heat transfer and anti-leakage performance of phase change materials 直接合成多孔氮化铝泡沫，提高相变材料的传热和防渗漏性能

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-02-15 DOI: 10.1016/j.tca.2024.179706

Rui Chen, Deheng Li, Nan Sheng, Chunyu Zhu

引用次数: 0

Changes in the devolatization kinetics induced by washing pretreatments of short- and long-aged food crop residues 短期和长期食用作物残渣清洗预处理引起的脱胶动力学变化

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-02-15 DOI: 10.1016/j.tca.2024.179705

Carmen Branca , Colomba Di Blasi

{"title":"Changes in the devolatization kinetics induced by washing pretreatments of short- and long-aged food crop residues","authors":"Carmen Branca , Colomba Di Blasi","doi":"10.1016/j.tca.2024.179705","DOIUrl":"10.1016/j.tca.2024.179705","url":null,"abstract":"<div><p>Thermogravimetric curves are measured and modeled to quantify the changes induced by dilute acid or hot water washing on the devolatilization of short- and long-aged potato crop residues. The pretreatments cause more similar behaviors. A six-step devolatilization mechanism for four pseudo-components, previously developed for raw materials, is still applicable. The activation energies remain unvaried whereas small changes in the pre-exponential factors describe the displacement of the devolatilization process at higher temperatures. Instead, the nature and amounts of pseudo-components are significantly modified, especially for dilute acid washing and the short-aged sample. The pseudo-components pectin-hemicellulose and cellulose-starch are enriched in hemicellulose and cellulose, respectively. The corresponding total amounts of volatile generated increase from 19 up to 23–26wt% and from 19–26 up to 37–45wt%, in the same order. The volatile product yields released from the pseudo-component lignin-protein are practically unaltered, but lignin is likely to become largely predominant.</p></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0040603124000443/pdfft?md5=0d4c36d260c390e912f64aea411ae639&pid=1-s2.0-S0040603124000443-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139882203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Very long-time crystallization kinetics for ethylene-methacrylic acid ionomers neutralized with zinc, sodium, lithium and magnesium 用锌、钠、锂和镁中和的乙烯-甲基丙烯酸离子聚合物的超长时间结晶动力学

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-02-12 DOI: 10.1016/j.tca.2024.179694

Brian P. Grady

引用次数: 0

Isoconversional methods: The many uses of variable activation energy 等转化法：可变活化能的多种用途

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-02-10 DOI: 10.1016/j.tca.2024.179701

Sergey Vyazovkin

引用次数: 0