Thermochimica Acta最新文献_第9页

Ultrafine Fe(OH)3 nanoparticles formation via oxidation-mediated strategies towards remarkable flame-retardant and smoke-suppressant performances 通过氧化介导策略形成超细 Fe（OH）3 纳米颗粒，实现卓越的阻燃和抑烟性能

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-18 DOI: 10.1016/j.tca.2024.179767

Guangyan Chen , Zai-Yin Hu , Zhijun Guo , Yi Xie

{"title":"Ultrafine Fe(OH)3 nanoparticles formation via oxidation-mediated strategies towards remarkable flame-retardant and smoke-suppressant performances","authors":"Guangyan Chen , Zai-Yin Hu , Zhijun Guo , Yi Xie","doi":"10.1016/j.tca.2024.179767","DOIUrl":"https://doi.org/10.1016/j.tca.2024.179767","url":null,"abstract":"<div>Transition metal nanomaterials are widely applied as flame retardants in materials. Herein, an oxidation-mediated strategy was developed for temporally controlling the in situ growth of Fe(OH)3 nanoparticles on wool/nylon (W/N) fabrics. The formed particles exhibit homogeneous dispersion on the surface of W/N fabrics, with an average particle diameter of about 60 nm. These Fe(OH)3 nanoparticles can simultaneously enhance both the flame retardancy (the limiting oxygen index increased by 18.8 % and passed the UL-94 burning test of V-0 rating) and mechanical performance (the tensile strength increased by 9.13 %) of the W/N fabrics. Meanwhile, the obtained W/N fabrics exhibit remarkable smoke-suppressant properties, demonstrating a reduction of 76.4 % and 65.5 % in smoke production rate and total smoke production, respectively, compared to the pure W/N fabrics. Furthermore, the prepared W/N fabrics exhibit good durability. This innovative strategy may be also extended for synthesizing other nanomaterials and pave a new path to develop high-performance flame-retardant materials.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"737 ","pages":"Article 179767"},"PeriodicalIF":3.5,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141078010","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

Thermal stability of organic Phase Change Materials (PCMs) by accelerated thermal cycling technique 通过加速热循环技术实现有机相变材料（PCM）的热稳定性

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-17 DOI: 10.1016/j.tca.2024.179771

Mohamed Katish , Stephen Allen , Adam Squires , Veronica Ferrandiz-Mas

{"title":"Thermal stability of organic Phase Change Materials (PCMs) by accelerated thermal cycling technique","authors":"Mohamed Katish , Stephen Allen , Adam Squires , Veronica Ferrandiz-Mas","doi":"10.1016/j.tca.2024.179771","DOIUrl":"10.1016/j.tca.2024.179771","url":null,"abstract":"<div>Phase change materials (PCMs) can improve thermal comfort of occupants acting as thermal energy storage systems. During their service life, PCMs undergo many phase change transitions. However, there is a lack of feasible and cost-effective techniques to evaluate the effect of thermal cycling on the long-term stability and performance of PCMs, which can influence their selection and restrict a broader acceptance of these materials by the construction sector. This study developed a novel accelerated thermal cycling multi-technique to assess the stability and reliability of PCMs under dynamic thermal conditions. All investigated PCMs showed remarkable stability in terms of phase change temperature and latent heat energy even after undergoing 10,000 thermal cycles. The Thermogravimetric Analysis (TGA) results underscore the suitability of these PCMs for built environments, with minimal mass loss at lower temperatures (below 150 °C). The Fourier Transform Infrared spectroscopy (FT-IR) and 1H Nuclear Magnetic Resonance (NMR) results revelled no molecular changes induced by thermal cycling. The novel accelerated thermal cycling technique provides more accurate results than thermal cycling using Differential Scanning Calorimetry (DSC) only, overcoming the issues of contamination and subcooling of smaller samples in DSC measurements.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"737 ","pages":"Article 179771"},"PeriodicalIF":3.5,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0040603124001102/pdfft?md5=0773a1800fd5356dcdbb01a083fc7121&pid=1-s2.0-S0040603124001102-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141041287","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

High-pressure cure kinetics and unexpected cure separation of peroxide-cured silicone rubber under compressed CO2 压缩二氧化碳下过氧化物固化硅橡胶的高压固化动力学和意外固化分离

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-17 DOI: 10.1016/j.tca.2024.179772

Donglin Li , Zi Wei , Lifen Li , Wenxin Deng , Shaofeng Xiong , Yunhan Hu , Xuhuang Chen , Peng Yu

{"title":"High-pressure cure kinetics and unexpected cure separation of peroxide-cured silicone rubber under compressed CO2","authors":"Donglin Li , Zi Wei , Lifen Li , Wenxin Deng , Shaofeng Xiong , Yunhan Hu , Xuhuang Chen , Peng Yu","doi":"10.1016/j.tca.2024.179772","DOIUrl":"10.1016/j.tca.2024.179772","url":null,"abstract":"<div>In this study, high-pressure differential scanning calorimetry (HP-DSC) was used to examine the curing process of a peroxide-cured silicone rubber (SR) system under compressed CO2 to investigate the influence of pressure and CO2 on the curing process. We found that the curing reaction occurred in two parts, described as cure separation, because of the dual effect of CO2 pressure and solvation at 6 MPa CO2. Consequently, peak fitting was used to calculate the kinetic parameters of the two-part reaction at 6 MPa CO2. Results indicate that pressure and CO2 exerted a combined effect on the curing reaction. In particular, pressure and CO2 solvation effects changed with varying conversion rates and CO2 pressures. This study provides an effective analysis methodology and an accurate kinetic model for characterizing and predicting high-pressure cure kinetics and unexpected cure separation in a peroxide-cured SR system under compressed CO2.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"737 ","pages":"Article 179772"},"PeriodicalIF":3.5,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141034570","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

Obituary Note: Prof. Ing. Jaroslav Šesták (1938.9.25–2024.4.22) 讣告： Ing. Jaroslav Šesták 教授（1938.9.25-2024.4.22雅罗斯拉夫-谢斯塔克（1938.9.25-2024.4.22）

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-11 DOI: 10.1016/j.tca.2024.179765

Nobuyoshi Koga , Jiri Málek

引用次数: 0

Phosphorus features halogen –calcium hypophosphite replaces antimony trioxide, reduces smoke, and improves flame retardancy 磷的特点是卤素--次磷酸钙取代三氧化二锑，减少烟雾，提高阻燃性能

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-11 DOI: 10.1016/j.tca.2024.179764

Sebastian Manfred Goller, Bernhard Schartel, Simone Krüger

{"title":"Phosphorus features halogen –calcium hypophosphite replaces antimony trioxide, reduces smoke, and improves flame retardancy","authors":"Sebastian Manfred Goller, Bernhard Schartel, Simone Krüger","doi":"10.1016/j.tca.2024.179764","DOIUrl":"https://doi.org/10.1016/j.tca.2024.179764","url":null,"abstract":"<div>Replacing antimony trioxide (ATO) in flame retardant formulations is an urgent task due to its toxicity. There are indications that calcium hypophosphite (CaP) may be a promising replacement. This study investigates the decomposition, fire behavior, and smoke release of brominated flame-retarded acrylonitrile butadiene styrene (ABS) under various fire scenarios like ignition, developing fire and smoldering, while replacing ATO with CaP and CaP/talc. Adding 4 wt.-% of talc to CaP formulations showed beneficial effects on flammability due to changes in the viscosity and barrier properties. Synergism between 8 wt.-% talc and CaP improved the protective layer in the developing fire scenario, resulting in a ∼60 % decrease in the peak of heat release rate and reduction of ∼21 % in total smoke production (ref. ABS+Br+ATO). With a conventional index of toxicity (CIT) of below 0.75, ABS+Br+CaP passes the highest requirements according to EN 45545-2. Overall, the CaP/talc materials improve flame retardancy, show less smoke emission under forced flaming conditions, and prevent chronic intoxication and environmental pollution through smoke particles contaminated with antimony.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"737 ","pages":"Article 179764"},"PeriodicalIF":3.5,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140950101","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

Experimental consideration of the effects of calcium lignosulfonate and tannic acid on the flammability and thermal properties of polylactide composites 木质素磺酸钙和单宁酸对聚乳酸复合材料可燃性和热性能影响的实验研究

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-09 DOI: 10.1016/j.tca.2024.179769

Tomasz M. Majka , Ana Cláudia Pimentel , Susete Fernandes , Henrique Vazão de Almeida , João Paulo Borges , Rodrigo Martins

{"title":"Experimental consideration of the effects of calcium lignosulfonate and tannic acid on the flammability and thermal properties of polylactide composites","authors":"Tomasz M. Majka , Ana Cláudia Pimentel , Susete Fernandes , Henrique Vazão de Almeida , João Paulo Borges , Rodrigo Martins","doi":"10.1016/j.tca.2024.179769","DOIUrl":"https://doi.org/10.1016/j.tca.2024.179769","url":null,"abstract":"<div>The purpose of this study was to determine the quantitative and qualitative effects of the form of natural phenolic compounds (NPCs) on the decomposition of polylactide (PLA) under different measurement conditions. For this purpose, thermogravimetry analysis (TGA), differential scanning calorimetry (DSC), and pyrolysis-combustion flow calorimetry (PCFC) analyses were carried out not only on individual raw materials like calcium lignosulfonate (BX), tannic acid (TA), BX chemically modified with TA (BMT), but also on PLA/BX, PLA/TA, and PLA/BMT composites with 3, 6, and 9 wt.% of filler. Moreover, the work checked whether to obtain satisfactory results it is necessary to carry out chemical modification lasting many hours, or whether simple physical mixing of ingredients (TABX) is enough, e.g. in proportions 1:2, 2:4, 3:6. The results of these analyses showed that TA is neither a good flame retardant nor a highly swelling material, but when combined with BX physically or chemically, it can produce an interesting synergistic effect. This work proves that chemically obtained BMT hybrid material allows to reduce flammability by 30 % compared to PLA which cannot be achieved by physically mixing these components in a polymer melt. On the other hand, the addition of TABX is sufficient to achieve a good thermal stabilization effect under processing conditions.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"737 ","pages":"Article 179769"},"PeriodicalIF":3.5,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140909902","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

Specific binding of Ag+ to central CC mismatched base pair but not terminal CC pair in duplex DNA Ag+ 与双链 DNA 中的中心 C-C 错配碱基对而非末端 C-C 对的特异性结合

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-09 DOI: 10.1016/j.tca.2024.179770

Hidetaka Torigoe, Hayahide Kida

引用次数: 0

Dissolution behavior and thermodynamic study of N-ethyl-2,2-diisopropylbutylamide in fourteen mono solvents by experiments and molecular simulation 通过实验和分子模拟研究 N-乙基-2,2-二异丙基丁酰胺在十四种单溶剂中的溶解行为和热力学特性

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-08 DOI: 10.1016/j.tca.2024.179762

Chaoyang Wang , Xinlei Li , Tingting Liu , You Li , Qiang Zhang , Pin Yang , Mengjie Luo , Haifang Mao , Miaomiao Jin

{"title":"Dissolution behavior and thermodynamic study of N-ethyl-2,2-diisopropylbutylamide in fourteen mono solvents by experiments and molecular simulation","authors":"Chaoyang Wang , Xinlei Li , Tingting Liu , You Li , Qiang Zhang , Pin Yang , Mengjie Luo , Haifang Mao , Miaomiao Jin","doi":"10.1016/j.tca.2024.179762","DOIUrl":"https://doi.org/10.1016/j.tca.2024.179762","url":null,"abstract":"<div>N-ethyl-2,2-diisopropylbutylamide (WS-27) is a new cooling agent with a soothing, long-lasting cooling effect, widely used in personal care and cosmetic products. The dissolution behavior of WS-27 in fourteen mono solvents (methanol, ethanol, n-propanol, isopropanol, n-butanol, n-pentanol, methyl acetate, ethyl acetate, isopropyl acetate, propyl acetate, butyl acetate, dichloromethane, cyclohexanone, and acetone) was measured using a dynamic laser monitoring method from 263.15 K to 298.15 K under 101.6 ± 1.2 kPa. In these selected solvents, the solubility of WS-27 increased with increasing temperature. The van't Hoff equation, λh equation, modified Apelblat equation, Wilson model, and NRTL (non-random two-liquid) model were applied to correlate the experimental solubility data of WS-27, and the modified Apelblat equation showed the best-fitting results. In addition, the intermolecular interactions and solvent effect were analyzed using the Hirshfeld surface analysis, molecular electrostatic potential surface analysis, and KAT-LSER model analysis to understand the dissolution behavior of WS-27. The results indicate that the solubility of WS-27 is influenced by multiple factors, and there can be other factors as well. These fundamental data can provide essential information for the crystallization and purification process of WS-27.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"737 ","pages":"Article 179762"},"PeriodicalIF":3.5,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140909903","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 approach to quantitative assessment of reactivity under non-isothermal conditions 非等温条件下定量评估反应性的等转化方法

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-06 DOI: 10.1016/j.tca.2024.179766

Andrey Galukhin

引用次数: 0

Thermal stability of binary and ternary biodegradable polymer blends assessed by isoconversional kinetic analysis 通过等转化动力学分析评估二元和三元生物可降解聚合物混合物的热稳定性

IF 3.5 2区化学

Thermochimica Acta Pub Date : 2024-05-02 DOI: 10.1016/j.tca.2024.179761

Tibor Dubaj , Stefano Vecchio Ciprioti , Jacopo Tirillò , Fabrizio Sarasini

{"title":"Thermal stability of binary and ternary biodegradable polymer blends assessed by isoconversional kinetic analysis","authors":"Tibor Dubaj , Stefano Vecchio Ciprioti , Jacopo Tirillò , Fabrizio Sarasini","doi":"10.1016/j.tca.2024.179761","DOIUrl":"https://doi.org/10.1016/j.tca.2024.179761","url":null,"abstract":"<div>Here we report on kinetic analysis of thermal degradation of polymer blends based on incremental isoconversional method coupled with mathematical deconvolution of thermogravimetric curves based on Fraser–Suzuki peak function. The measured kinetic envelope was decomposed into contributions approximately corresponding to degradation of each constituent of a polymer blend. Kinetic parameters from isoconversional analysis were further used for estimating the effect of blending on thermal stability of the constituents. Compared to routinely used parameters such as degradation onset temperature or DTG-peak temperature, the deconvolution analysis allows to determine stability of all components in a mixture regardless of their relative content. Here we also show that deconvolution analysis can be carried out directly on integral α(T) curves, thus bypassing the work with differential data dα/dt. Isoconversional analysis of deconvoluted α(T) curves allows to calculate various parameters for assessing the potentially accelerating or inhibiting effect on thermal degradation, for example, by means of decomposition half-time t0.5. The results can be made more robust by utilizing relative criteria for stability such as t0.5(blend)/t0.5(neat polymer). Using this approach, detrimental effect of PHBV and PBAT on thermal stability of PLA above 300 °C was confirmed. On the other hand, stability of PHBV in both binary and ternary mixtures was improved compared to neat polymer.</div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"736 ","pages":"Article 179761"},"PeriodicalIF":3.5,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S004060312400100X/pdfft?md5=f59d7858752d1210a5cf050455324243&pid=1-s2.0-S004060312400100X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140822858","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