International Journal of Polymer Analysis and Characterization最新文献_第5页

Investigation of the mechanical behavior of AL7075 plate supported hybrid composite plates using artificial neural networks algorithm 基于人工神经网络算法的AL7075板支混合复合材料板力学行为研究

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-07-04 Epub Date: 2025-04-21 DOI: 10.1080/1023666X.2025.2491030

Burhan Tepehan , İsmail Yasin Sülü

{"title":"Investigation of the mechanical behavior of AL7075 plate supported hybrid composite plates using artificial neural networks algorithm","authors":"Burhan Tepehan , İsmail Yasin Sülü","doi":"10.1080/1023666X.2025.2491030","DOIUrl":"10.1080/1023666X.2025.2491030","url":null,"abstract":"<div><div>The mechanical behavior of the hybrid structure formed by placing an AL7075 plate as the middle layer between different composite fibers was examined. Glass fiber and carbon fiber were preferred as fibers. Epoxy was used as matrix material. Four different cases with different fiber material layer alignments were examined. The produced plates were cut according to ASTM standards suitable for the tests to be performed, and samples were created. The samples were subjected to tensile tests, three-point bending tests, and ballistic tests. It has been determined that samples produced in sequential order with different layers reached high stress values in tensile tests and bending tests. It was observed that all alignments gave successful results in ballistic tests. In layered hybrid structures, the mechanical effects of the layer order and the type of material used on the hybrid structures have been demonstrated. The Levenberg-Marquardt algorithm with artificial neural networks was applied to investigate the appropriateness of the results. The results were presented to be appropriate in the graphs created with artificial neural networks, and it could be said that they were compatible. It can be said that more effective results are obtained in the combinations of carbon/glass/carbon and glass/carbon/glass composite fibers in layer arrangements.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 5","pages":"Pages 543-562"},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electron beam irradiated composite based on poly (lactic acid)/aloe vera and its applications in biodegradable food packaging 电子束辐照聚乳酸/芦荟复合材料及其在可生物降解食品包装中的应用

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-07-04 Epub Date: 2025-03-20 DOI: 10.1080/1023666X.2025.2478242

Reham H. Helal , H. Radi , E. S. Fathy , Salwa M. Elmesallamy , Khaled F. El-Nemr

引用次数: 0

Characterization of fire-retardant composites from waste materials: balancing properties and performance 废材料阻燃复合材料的表征：平衡特性和性能

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-07-04 Epub Date: 2025-05-02 DOI: 10.1080/1023666X.2025.2495286

Mohammed Akabe , Tajudeen Kolawole Bello , Yusuf Adamu , Abdullahi Bello , Muhammed Tijani Isa

{"title":"Characterization of fire-retardant composites from waste materials: balancing properties and performance","authors":"Mohammed Akabe , Tajudeen Kolawole Bello , Yusuf Adamu , Abdullahi Bello , Muhammed Tijani Isa","doi":"10.1080/1023666X.2025.2495286","DOIUrl":"10.1080/1023666X.2025.2495286","url":null,"abstract":"<div><div>The effectiveness of wastepaper (wP) reinforced with waste polyethylene (wPE) and cow horn ash (CHA) as a fire-retardant additive (FRA) was studied for fire-retardant composites (FRCs) application. The research investigates the effects of varying CHA content (0 wt.% to 50 wt.%) on the developed composites. The analysis involved determining the physical, mechanical, flammability, and thermal properties, also, the surface morphologies and function groups were assessed to evaluate the microstructure and chemical interactions. Modifying the wP/wPE matrix with CHA enhanced fire resistance and mechanical properties. The FRC containing 30 wt.% CHA (FRC-30) exhibited the best overall performance, with a density of 2.89 g/cm³, hardness of 623.29, water absorption of 3.13%, tensile stress modulus of 6.55 MPa and 802.37 MPa, and flexural strength and modulus of 8.04 MPa and 445.81 MPa, respectively. Its fire-retardant properties also exhibited the lowest burning rate (1.86 × 10<sup>−3</sup> g/s), a reduced heat release (41.20 kJ), a superior ignition time of 83.96 s, and a reduced fire spread (122 mm/s). FRC-30 also demonstrated excellent thermal properties of thermal diffusivity of 73.63 m<sup>2</sup>/s and low thermal conductivity of 8.87 × 10<sup>−2</sup> W/m.K. The hydroxyl and phosphate groups in CHA, identified through FTIR, enhanced the interfacial bonding, and dispersion within the wPE matrix, as observed via SEM. This resulted in improved mechanical performance and fire resistance. The study concluded that FRC-30 offers an ideal combination of fire retardancy, mechanical strength, and thermal stability. This makes it a potential candidate for use in construction, insulation, and other engineering fields where enhanced fire safety is crucial.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 5","pages":"Pages 581-602"},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Forensic evaluation of 10 types of rubber popularly used with Fourier transform infrared (FTIR) spectroscopy 傅立叶变换红外光谱法对常用的10种橡胶进行鉴定

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-07-04 Epub Date: 2025-05-03 DOI: 10.1080/1023666X.2025.2496299

Jungang Lv , Jimin Feng

{"title":"Forensic evaluation of 10 types of rubber popularly used with Fourier transform infrared (FTIR) spectroscopy","authors":"Jungang Lv , Jimin Feng","doi":"10.1080/1023666X.2025.2496299","DOIUrl":"10.1080/1023666X.2025.2496299","url":null,"abstract":"<div><div>Rubber is a type of important evidence in forensic cases, for example, in traffic accident cases. It can help identify or exclude suspected vehicles by analyzing and comparing rubber evidence left on site when the vehicle brakes with the samples from suspected vehicles. In many other cases, rubber products are also important investigative clues because of their widespread application in daily life. Currently, there are 10 types of rubber popularly used in China. Infrared spectroscopy can effectively distinguish the 10 types of rubber. However, only comparing the shapes of infrared spectra from the samples left on sites and from suspected samples generates risks in differentiation, as some weak characteristic peaks are easily overlooked, leading to misjudgment in forensics. It is necessary to have a clear understanding of these characteristic peaks and their chemical bond assignments to achieve identification more effectively and quickly. So, the main and auxiliary indicative peaks were summarized and interpreted. The results showed that infrared can provide safer and more reliable detection results in cases; the assignments of the peaks also added basic information and would be helpful to future microplastics studies.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 5","pages":"Pages 603-616"},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of hydrophobic filament for fused deposition modeling via single screw extruder 单螺杆挤出熔融沉积成型疏水长丝的研制

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-07-04 Epub Date: 2025-03-19 DOI: 10.1080/1023666X.2025.2478235

Avinash Kumar , Yadav Narendra Kumar Rajbahadur , Sushant Negi , Simanchal Kar

{"title":"Development of hydrophobic filament for fused deposition modeling via single screw extruder","authors":"Avinash Kumar , Yadav Narendra Kumar Rajbahadur , Sushant Negi , Simanchal Kar","doi":"10.1080/1023666X.2025.2478235","DOIUrl":"10.1080/1023666X.2025.2478235","url":null,"abstract":"<div><div>This article presents a distinctive method of developing hydrophobic filaments for fused filament fabrication (FFF) of a hydrophobic mesh for oil-water separation. In this method, a modified solvent casting method is used to develop hydrophobic filaments for mesh fabrication. The fabrication process is achieved by integrating concentrations of hexadecyltrimethoxysilane (HDTMS) and polytetrafluoroethylene (PTFE) into a polylactic acid (PLA) slurry. In order to check the filament property, the filaments are characterized using water contact angle (WCA) measurements, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and thermal gravimetric analysis (TGA). The observations revealed that incorporating HDTMS and PTFE into PLA significantly enhances the filament’s hydrophobic properties by altering their microstructure. An optimal water contact angle of 125.76° is achieved with 2 g PLA + 0.2 mL HDTMS + 1 mL PTFE. Further, the SEM analysis showed that adding HDTMS and PTFE improves the surface properties by reducing voids, thereby enhancing the hydrophobicity. Furthermore, the addition of HDTMS and PTFE also improves the thermal and mechanical properties of the filaments. The current filament is expected to function as an oil-water separation mesh, which will be used in both commercial and domestic devices.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 5","pages":"Pages 501-513"},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of carbon black and cotton fiber on the mechanical and thermal properties of natural rubber composites: a statistical optimization using Central composite design 炭黑和棉纤维对天然橡胶复合材料力学和热性能的影响：基于Central复合材料设计的统计优化

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-07-04 Epub Date: 2025-04-30 DOI: 10.1080/1023666X.2025.2495283

Sumit Kumar , Sohan Lal , Sanjiv Arora , Parvin Kumar , Shikha Rani , Anjali Verma , Anita Kumari

{"title":"Influence of carbon black and cotton fiber on the mechanical and thermal properties of natural rubber composites: a statistical optimization using Central composite design","authors":"Sumit Kumar , Sohan Lal , Sanjiv Arora , Parvin Kumar , Shikha Rani , Anjali Verma , Anita Kumari","doi":"10.1080/1023666X.2025.2495283","DOIUrl":"10.1080/1023666X.2025.2495283","url":null,"abstract":"<div><div>The objective of this study is to enhance the thermal as well as the mechanical properties of vulcanized natural rubber with hybrid reinforcement including alkali-treated cotton fiber and carbon black. The central composite design and response surface methodology techniques were employed to design the experiment and examine optimum mechanical strength with corresponding optimum reinforcement composition. The tensile strength of composites increased from 1.71 to 18.87 MPa as a result of reinforcement. Likewise, the tear strength was improved from 23.20 to 57.91 N/mm. The thermal stability of the composites gets enhanced with the addition of carbon black from 320 °C to 343 °C. FTIR and SEM analysis revealed intercomponent interactions and surface texture of prepared composites. The hybrid reinforcement of cotton fiber and carbon black in the rubber matrix brings out enhancement in mechanical properties as well as the thermal stability of the final composite material. A minute increment in the density of samples was noticed with the addition of cotton fiber and carbon black in the rubber matrix. This increase in density is significantly less than the increase in mechanical strength of composites, which is a good parameter for application purposes of composites.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 5","pages":"Pages 563-580"},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimizing PVA hydrogel characteristics and properties through physical and chemical crosslinking for oil-painting restoration 通过物理和化学交联优化油画修复用PVA水凝胶的特性和性能

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-07-04 Epub Date: 2025-04-11 DOI: 10.1080/1023666X.2025.2487263

Watsachon Leksomboon , Duangdao Aht-Ong , Pichayada Katemake , Kamonwan Pacaphol

{"title":"Optimizing PVA hydrogel characteristics and properties through physical and chemical crosslinking for oil-painting restoration","authors":"Watsachon Leksomboon , Duangdao Aht-Ong , Pichayada Katemake , Kamonwan Pacaphol","doi":"10.1080/1023666X.2025.2487263","DOIUrl":"10.1080/1023666X.2025.2487263","url":null,"abstract":"<div><div>Polymer gels have presently been employed instead of cotton wool soaked with organic solvents to clean artwork in cultural heritage restoration since they are less harmful to the artwork’s surface and more efficient in safe cleaning. A lack of insight into the characteristics and properties of polymer gels produced by various materials and methods leads to misuse and might cause damage to artwork. In this work, poly(vinyl alcohol) (PVA) was employed to produce a cleaning gel. Different crosslinking agents, sodium tetraborate (borax), borax plus polyethylene glycol (borax-PEG), and glutaraldehyde, were studied together with various gel formation methods, solely casting, casting plus freeze-thawing, and casting plus freeze-thawing and solvent soaking. Characterization and property tests were carefully conducted to understand the behavior of produced materials. The porosity of the PVA gel crosslinked with borax-PEG significantly increased by freeze-thawing. After being loaded with water, the porous structure was maintained even as it swelled, and its confined water was slowly released when the gel was left on an oil painting. The 4 wt% PVA gel crosslinked with 5% borax and 0.5% PEG, after freeze-thawing and water soaking, exhibited the most suitable rigidity and elasticity for the required cleaning gel properties and provided better cleaning efficiency on oil paintings than other gels. These results indicated that PVA crosslinked with borax plus PEG and formed by the casting plus freeze-thawing and solvent soaking could be an alternatively suitable material for a cleaning gel in oil-painting restoration.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 5","pages":"Pages 531-542"},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Degradation study of CPVC pipe subjected to bursting tests and prediction of service life CPVC管材爆破试验降解研究及寿命预测

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-07-04 Epub Date: 2025-04-17 DOI: 10.1080/1023666X.2025.2490012

Hind Bennis , Rabiaa Elkori , Sara Sandabad , Abdelilah Hachim , Khalid El Had , Anas El Maliki

{"title":"Degradation study of CPVC pipe subjected to bursting tests and prediction of service life","authors":"Hind Bennis , Rabiaa Elkori , Sara Sandabad , Abdelilah Hachim , Khalid El Had , Anas El Maliki","doi":"10.1080/1023666X.2025.2490012","DOIUrl":"10.1080/1023666X.2025.2490012","url":null,"abstract":"<div><div>Thermoplastic pipes made from chlorinated polyvinyl chloride (CPVC) can undergo varying degrees of degradation due to extreme fluctuations in pressure and temperature. This underscores the importance of controlling their mechanical properties and identifying potential failures before they occur. The present research focuses on evaluating damage in CPVC pipes using deterministic methods, such as damage and reliability analysis. To assess the degradation of these pipes, experimental tests were conducted to determine the mechanical factors influencing their performance. Specifically, burst pressures and times were recorded during the tests. Additionally, analytical damage models were developed based on modified and simplified versions of the unified stress and strain theory, static damage models, and the unified theory of damage. By applying the principles of the unified damage theory, the evolution of life fractions as a function of burst pressures was tracked for both blank and notched pipes.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 5","pages":"Pages 617-629"},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface reactivity of polypropylene grafted with carboxylate groups (COO−) in the competitive adsorption of Pb2+, Cu2+, and Cd2+ in aqueous solution 羧酸基接枝聚丙烯（COO−）在水溶液中竞争吸附Pb2+、Cu2+和Cd2+时的表面反应性

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-05-19 Epub Date: 2025-03-01 DOI: 10.1080/1023666X.2025.2470944

Mariela Molina Jacinto , Karen Estefanía Zárate-Rodríguez , Rosa María Gómez-Espinosa

{"title":"Surface reactivity of polypropylene grafted with carboxylate groups (COO−) in the competitive adsorption of Pb2+, Cu2+, and Cd2+ in aqueous solution","authors":"Mariela Molina Jacinto , Karen Estefanía Zárate-Rodríguez , Rosa María Gómez-Espinosa","doi":"10.1080/1023666X.2025.2470944","DOIUrl":"10.1080/1023666X.2025.2470944","url":null,"abstract":"<div><div>In this study, we developed a new material (PPAAcO<sup>−</sup>Na<sup>+</sup>) charge with carboxylate groups to remove metal ions (Pb<sup>2+</sup>, Cd<sup>2+</sup>, and Cu<sup>2+</sup>) through ion exchange of multimetal solutions, (PPAAcO)<sub>n</sub>M<sup>2+</sup>. The polymeric surface of polypropylene (PP) was functionalized with carboxylate groups (PPAAcO<sup>−</sup>Na<sup>+</sup>) through grafting and the acid-base reaction of carboxylic acid (PPAA). FTIR-ATR corroborated the change of –COOH (1711 cm<sup>−1</sup>) to COO<sup>−</sup>Na<sup>+</sup> (1562 cm<sup>−1</sup>) on functionalized PP. TGA-DSC showed a decrease in the melting energy of PPAA (75.09 J/g) and PPAAcO<sup>−</sup>Na<sup>+</sup> (44.98 J/g). The effect of the grafting degree of COO<sup>−</sup> and its relationship with the concentration of acrylic acid (AA) was studied with grafting of 30%, 80%, and 154% on PPAAcO<sup>−</sup>Na<sup>+</sup>. SEM-EDS evidenced the relationship of the AA concentration, showing a thickening of the PPAAcO<sup>−</sup>Na<sup>+</sup> fibers. The performance of PPAAcO<sup>−</sup>Na<sup>+</sup> as a function of the grafting degree in the removal of Pb<sup>2+</sup>, Cd<sup>2+</sup>, and Cu<sup>2+</sup>, showed the following trend: Pb<sup>2+</sup>>Cd<sup>2+</sup>>Cu<sup>2+,</sup> achieving an efficiency greater than 90%. The fast adsorption of the metallic ions (120 min) suggests an ion exchange process, promoting a chemical interaction between PPAAcO<sup>−</sup>Na<sup>+</sup> and the metallic ions, resulting in a polymer-metal complex (PPAAcO)<sub>n</sub>M<sup>2+</sup>. PPAAcO<sup>−</sup>Na<sup>+</sup> has the potential to be a new, easily obtained material capable of coordinating and stabilizing metal ions on its surface.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 4","pages":"Pages 423-440"},"PeriodicalIF":1.7,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on water properties and spatial structure of water in poly(2-methoxy ethylacrylate)s with different molecular weights by nuclear magnetic resonance spectroscopy 核磁共振波谱法研究不同分子量聚（2-甲氧基乙基丙烯酸酯）中水的性质及水的空间结构

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-05-19 Epub Date: 2025-02-23 DOI: 10.1080/1023666X.2025.2467164

Akira Mochizuki , Yuko Miwa , Konatsu Yoneyama , Chie Yahata , Yoshiki Oda

{"title":"Study on water properties and spatial structure of water in poly(2-methoxy ethylacrylate)s with different molecular weights by nuclear magnetic resonance spectroscopy","authors":"Akira Mochizuki , Yuko Miwa , Konatsu Yoneyama , Chie Yahata , Yoshiki Oda","doi":"10.1080/1023666X.2025.2467164","DOIUrl":"10.1080/1023666X.2025.2467164","url":null,"abstract":"<div><div>Poly(2-methoxyethyl acrylate) (PMEA) is known for its favorable blood compatibility, attributed to its unique intermediate water content, as identified by differential scanning calorimetry. Previously, we reported that PMEA contains two types of water—upfield and downfield waters—characterized by <sup>2</sup>H-nuclear magnetic resonance (<sup>2</sup>H-NMR) and proposed that upfield water is a key factor in expressing good blood compatibility. In the present study, further investigations of the role of upfield water and clarification of the spatial water structure were performed using PMEAs with different molecular weights. <sup>2</sup>H-NMR analysis revealed that the upfield water content was almost constant, regardless of the molecular weight, whereas the downfield water content increased with an increase in the molecular weight of PMEA. Based on these findings, the role of upfield water is discussed. Homonuclear and heteronuclear Overhauser effect spectroscopies revealed that upfield water existed near the methoxy group of PMEA, within a 0.5 nm range.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 4","pages":"Pages 393-407"},"PeriodicalIF":1.7,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0