Macromolecular Symposia最新文献

{"title":"Tensile Properties of Epoxy Composites Filled With Graphene Nanoplatelets and PUF Microcapsules","authors":"Ana Paula Nascimento,&nbsp;Cesar G. Ribeiro,&nbsp;Gustavo H. Zoschke,&nbsp;James Njuguna,&nbsp;Sergio H. Pezzin","doi":"10.1002/masy.202400102","DOIUrl":"https://doi.org/10.1002/masy.202400102","url":null,"abstract":"<p>This work evaluates the effect of poly(urea-formaldehyde) (PUF) microcapsules filled with aminated polydimethylsiloxane (PDMS-a), a self-healing agent, on the tensile properties of epoxy composites reinforced with graphene nanoplatelets (GNP). The microcapsules are produced by interfacial polymerization and later are infiltrated with the healing agent (PDMS-a). GNP are dispersed in epoxy resin using sonication, followed by the addition of hollow or filled PUF microcapsules to the system, using mechanical stirring, just before the addition of the curing agent (hardener). The mixture is then cast in soft molds to produce specimens for tensile tests. The results show that the presence of 1 wt% GNP changes the properties of the composites with an improvement in tensile strength and modulus, which achieves 37.4 MPa and 2.8 GPa, respectively, in comparison with neat epoxy and specimens containing just microcapsules. The addition of 2 wt% GNP, however, impairs these properties, with tensile strength and Young's modulus decreasing to 24.9 MPa and 2.3 GPa, due to the presence of GNP agglomerates. The presence of the microcapsules, however, decreases the immediate (no self-healing) tensile performance of the composites.</p>","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Characterization of Poly(butyl acrylate-co-farnesene) by Emulsion Polymerization Technique for Pressure-Sensitive Adhesives","authors":"Lina Dayse Alcantara Rodrigues,&nbsp;Maurício Pinheiro Oliveira","doi":"10.1002/masy.202400098","DOIUrl":"https://doi.org/10.1002/masy.202400098","url":null,"abstract":"<p>The development of new sustainable materials has been growing in the last few years, especially polymers derived from renewable monomers to replace petroleum-derived monomers in adhesive applications. In this context, copolymerization of <i>β-</i>Farnesene (Far) with <i>n</i>-butyl acrylate (BA) using different ratios of BA and Far (100/0, 80/20, and 50/50 wt/wt) is investigated by semi-bath emulsion polymerization for use in pressure-sensitive adhesives (PSA). Latexes with different BA and Far contents are obtained with good colloidal stability and a hydrodynamic diameter range of 120–140 nm. The copolymerization between Far and BA is confirmed by FT-IR and DSC analyses. As the Far content increases, both overall conversion, elongation at break, and loop tack decrease. On the other hand, the lass transition temperature (<i>T</i>_g), gel content, and shear strength increase. The glass transition temperature of copolymers is higher than the theoretical <i>T</i>_g values and is dependent on the Far contents. The use of Far provides additional insights for the production of bio-based PSAs by emulsion polymerization, which is characterized by an increase in both shear strength and cohesion. Among the proportions of BA/Far studied, the most promising results for application in PSA tapes are 80 wt% of BA and 20 wt% of Far.</p>","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Macromol. Symp. 413-6","authors":"","doi":"10.1002/masy.202470026","DOIUrl":"https://doi.org/10.1002/masy.202470026","url":null,"abstract":"","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/masy.202470026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the Mechanical Properties and Adhesive Strength of Polychloroprene-Based Adhesives","authors":"Gabriel Bachega Rosa,&nbsp;Sandra Aparecida Coelho Mello,&nbsp;Silvana Navarro Cassu","doi":"10.1002/masy.202400089","DOIUrl":"https://doi.org/10.1002/masy.202400089","url":null,"abstract":"<p>In the present study, polychloroprene (CR) compounds containing different vulcanization agents and fumed silica at varied content are evaluated for application as adhesives. The vulcanization systems are based on zinc oxide (ZnO) or ferric acetylacetonate (FeAc). The fumed silica content varied from 0.3 up to 2.0 phr only in CR–FeAc compounds. The rheometric results indicated that the CR compounds containing FeAc reached a higher crosslink density, ≈ 1.5 higher than that observed for the CR compound vulcanized with the ZnO system. After vulcanization, the CR–ZnO compound shows the highest tensile strength and elongation at break. In the T-Peel tests, in which different solvents are tested in the unvulcanized CR compounds, the compositions containing ZnO in toluene/methyl ethyl ketone (MEK) show the highest adhesive strength. Among the CR–FeAc compounds, the addition of 2 phr of fumed silica results in the highest tensile strength and elongation at break, while the compound containing 1 phr of fumed silica shows the highest adhesive strength.</p>","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Macromol. Symp. 413-5","authors":"","doi":"10.1002/masy.202470022","DOIUrl":"https://doi.org/10.1002/masy.202470022","url":null,"abstract":"","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/masy.202470022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Title Page 413-5","authors":"","doi":"10.1002/masy.202470023","DOIUrl":"https://doi.org/10.1002/masy.202470023","url":null,"abstract":"","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/masy.202470023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"To Enhance the Performance of CI Engine with Using of Additives Based Hybrid Bio Fuel—A Review","authors":"Harish Kumar,&nbsp;Himansh Kumar","doi":"10.1002/masy.202400067","DOIUrl":"https://doi.org/10.1002/masy.202400067","url":null,"abstract":"<p>The growing demand of sustainable and environment friendly energy sources has spurred research and development efforts towards the integration of biofuels in various applications, particularly in internal combustion engines. Microemulsion technique is a new and innovative alternative to traditional fossil fuel that has gained a significant attention in recent years. This type of bio fuel is made by blending of small amount of biofuel and large amount of conventional diesel fuel. This review paper explores the potential of enhancing the performance of Compression ignition (CI) engines by incorporating additives into hybrid biofuels. The study focuses on the synergistic effects of combining traditional fossil fuels with bio-derived components, such as ethanol, biodiesel, and other bio-based additives. This review paper aim is to explore the performance of a 4-stroke, single-cylinder, direct injection Compression Ignition (CI) engine at different loads using different fuels blends like CNWEDB, BFNP150, PPNP150, and ME Diesel/Colza oil. The review outlines recent advancements in biofuel technology, including novel production methods and feedstock options, aiming to overcome limitations associated with conventional biofuels. The article aims to investigate the potential of vegetable oil in formulating MHBF, analyzing its performance and emissions in CI engines. The engine performance parameters viz., brake thermal efficiency brake specific fuel consumption have been reviewed and found that these values are comparable to the biodiesel blends with pure petrodiesel. At 60%, 80%, and full load condition the BTE of microemulsion diesel/colza oil is increasing while at 40%, 80%, and full load the BSFC is decreasing. Emissions reported by the various researchers, however, have a positive attribute with respect to NO<i>_x</i>, CO, and UHC. At full load CO is decreasing and at all load conditions the value of UHC is decreasing. The paper concludes with a discussion on future research directions, emphasizing the need for continued innovation to address emerging issues and optimize the performance of CI engines for a sustainable and energy-efficient future.</p>","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Guest Particles on the Functional Dielectric Properties of Materials for Display Application","authors":"Mohd Avaish,&nbsp;Syed Salman Ahmad Warsi,&nbsp;Apoorva Dwivedi,&nbsp;Anoop Kumar Pandey,&nbsp;Rajiv Manohar,&nbsp;Kamal Kumar Pandey","doi":"10.1002/masy.202400048","DOIUrl":"https://doi.org/10.1002/masy.202400048","url":null,"abstract":"<p>In this study the dielectric properties are experimentally studied and also analyzed the influence of guest particles on the functional properties of various liquid crystals. The polar and elastic energy of the nanoparticles is found to affect the functional energy of pure suspension. In addition to this, the functional dielectric anisotropy of the dispersed system takes modified form. In this study experiments are performed on various materials to find dielectric anisotropy and also found in good agreement with theoretical explanation.</p>","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ion Conduction Mechanism in Polymer Blend Electrolyte Films","authors":"Kailash Kumar,&nbsp;Prabhakar Sharma,&nbsp;Pawan Singh Dhapola,&nbsp;Shri Prakash Pandey","doi":"10.1002/masy.202400160","DOIUrl":"https://doi.org/10.1002/masy.202400160","url":null,"abstract":"<p>This paper presents the development of the blend polymer solid electrolyte films (BPSE) for potential applications in electrochemical devices. Two host polymers, polyvinyl alcohol (PVA) and polymethyl methacrylate (PMMA), along with the salt KI, are employed to create the solid polymer electrolytes (SPEs). The synthesis involves varying the weight percentage of salt within the SPEs to investigate its impact on the material properties. Conductivity measurements are conducted using AC impedance spectroscopy, unveiling the conductivity behavior of the BPSEs. Additionally, surface morphology is characterized using polarized optical microscopy (POM) at 10 pixel resolution, offering a detailed examination of the film's microstructure. This comprehensive study not only contributes to the understanding of the fundamental properties of BPSEs but also opens avenues for their utilization in various electrochemical applications.</p>","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating the Transmission Type Reference Chamber for Small Field Dosimetry","authors":"A. Aziz Sait,&nbsp;S. A. Yoganathan,&nbsp;Nilay Dev,&nbsp;Nikhil Rastogi,&nbsp;S. P. Pandey,&nbsp;Sunil Mani,&nbsp;Raghavendiran Boopathy","doi":"10.1002/masy.202400046","DOIUrl":"https://doi.org/10.1002/masy.202400046","url":null,"abstract":"<p>To assess the efficacy of a transmission-type parallel plane reference chamber (T-REF) for small-field percentage depth dose (PDD) measurements using two high-resolution detectors. The study utilizes microSilicon and microDiamond detectors for small-field measurements, both with and without a T-REF reference chamber. TrueBeam linear accelerator provides various photon energies (6X, 6XFFF, 10X, 10XFFF) for depth dose measurements. A sun-nuclear 3D water tank is used to measure the PDD up to a depth of 15 cm. Analysis of the data includes a 1D gamma passing rate calculated using an in-house MATLAB program. The study compares the PDD measurements obtained with and without the T-REF. The T-REF exhibits negligible beam perturbations across different field sizes and energies. The overall maximum mean PDD differences are 0.31 ± 0.16% for microSilicon and 0.33 ± 0.17% for microdiamond. The overall mean 1D gamma passing rate is 99.6 ± 0.2%. This study demonstrates that the T-REF is a reliable and effective reference detector for small-field radiation dosimetry.</p>","PeriodicalId":18107,"journal":{"name":"Macromolecular Symposia","volume":"413 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}