Pub Date : 2021-01-01DOI: 10.1590/0104-1428.20210036
Marcos Antônio Barcelos, Mariana Valinhos Barcelos, G. R. D. Almeida Neto, A. C. Bozzi, R. Rodriguez
Vitória, ES, Brasil *mbbarcelos@yahoo.com.br Obstract In this work, a ternary composite of epoxy filled with ND and MS was produced for abrasive applications. Surfactants (oleic acid (OA), sodium dodecyl sulfate (SDS) and Triton TX-100 (TX-100)) were used to improve the particle dispersion and, consequently, the composite properties. The elastic modulus increased up to 76% for the sample with 1 wt% ND and 5 wt% ND using TX-100 (1ND5MS-TX100). Regardless of the filler concentration, the particles did not modify the thermal degradation behavior of the epoxy. Thermogravimetric (TGA) and dynamic mechanical (DMA) analyses suggest a strong particle-matrix interface, also evidenced in scanning electron microscope (SEM) micrographs. The composites presented superior tribological performance. 1ND5MS-TX100 presented a wear rate of 2.19 x 10 -3 mm 3 .Nm -1 , 61.3% lower than the epoxy. Also, all composites significantly reduced the roughness of the marble, being proportional to the abrasives concentration. Overall, composites with
{"title":"Epoxy hybrid composites reinforced with nanodiamond-silica for abrasive applications","authors":"Marcos Antônio Barcelos, Mariana Valinhos Barcelos, G. R. D. Almeida Neto, A. C. Bozzi, R. Rodriguez","doi":"10.1590/0104-1428.20210036","DOIUrl":"https://doi.org/10.1590/0104-1428.20210036","url":null,"abstract":"Vitória, ES, Brasil *mbbarcelos@yahoo.com.br Obstract In this work, a ternary composite of epoxy filled with ND and MS was produced for abrasive applications. Surfactants (oleic acid (OA), sodium dodecyl sulfate (SDS) and Triton TX-100 (TX-100)) were used to improve the particle dispersion and, consequently, the composite properties. The elastic modulus increased up to 76% for the sample with 1 wt% ND and 5 wt% ND using TX-100 (1ND5MS-TX100). Regardless of the filler concentration, the particles did not modify the thermal degradation behavior of the epoxy. Thermogravimetric (TGA) and dynamic mechanical (DMA) analyses suggest a strong particle-matrix interface, also evidenced in scanning electron microscope (SEM) micrographs. The composites presented superior tribological performance. 1ND5MS-TX100 presented a wear rate of 2.19 x 10 -3 mm 3 .Nm -1 , 61.3% lower than the epoxy. Also, all composites significantly reduced the roughness of the marble, being proportional to the abrasives concentration. Overall, composites with","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"5 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67120754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1590/0104-1428.20210049
T. J. Paes-Junior, N. R. Rossi, Tayná Mendes Inácio de Carvalho, V. Macedo, Michelle de Sá dos Santos Gomes, L. Nakano, C. M. Inagati
{"title":"Effect of drying different inclusion plasters on the mechanical properties of thermoactivated acrylic resins","authors":"T. J. Paes-Junior, N. R. Rossi, Tayná Mendes Inácio de Carvalho, V. Macedo, Michelle de Sá dos Santos Gomes, L. Nakano, C. M. Inagati","doi":"10.1590/0104-1428.20210049","DOIUrl":"https://doi.org/10.1590/0104-1428.20210049","url":null,"abstract":"","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67120579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1590/0104-1428.20210041
Yilmaz Anil Gunbekler, Hilmi Toker, Ç. Altay, Mustafa Kucuktuvek, Ergun Baysal
{"title":"Increasing the physical and combustion performance of Oriental beech by impregnating borates and coating liquid glass","authors":"Yilmaz Anil Gunbekler, Hilmi Toker, Ç. Altay, Mustafa Kucuktuvek, Ergun Baysal","doi":"10.1590/0104-1428.20210041","DOIUrl":"https://doi.org/10.1590/0104-1428.20210041","url":null,"abstract":"","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67120934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1590/0104-1428.210043
Juliana F.S.C. Lopes, Jean Tardelli, E. Rangel, Steven Frederick Durrant
{"title":"Structural and optical properties o plasma-deposited a-C:H:Si:O:N films","authors":"Juliana F.S.C. Lopes, Jean Tardelli, E. Rangel, Steven Frederick Durrant","doi":"10.1590/0104-1428.210043","DOIUrl":"https://doi.org/10.1590/0104-1428.210043","url":null,"abstract":"","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67125882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. T. Nguyen, Hung Q. Pham, Duc Anh Nguyen, L. Nguyen, K. Huynh, Hai Le Tran, P. Mai, H. T. Nguyen, L. Nguyen, T. Truong
1National Key Laboratory of Polymer and Composite Materials, Ho Chi Minh City University of Technology – HCMUT, Vietnam National University–Ho Chi Minh City – VNU–HCM, Ho Chi Minh City, Vietnam 2Faculty of Chemical Engineering, Ho Chi Minh City University of Technology – HCMUT, Vietnam National University Ho Chi Minh City VNU–HCM, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam 3Faculty of Materials Technology, Ho Chi Minh City University of Technology HCMUT, Vietnam National University – Ho Chi Minh City VNU–HCM, Ho Chi Minh City, Vietnam
{"title":"10-(pyren-1-yl)-10h-phenothiazine and pyrene as organic catalysts for photoinitiated ATRP of 4-vinylpyridine","authors":"L. T. Nguyen, Hung Q. Pham, Duc Anh Nguyen, L. Nguyen, K. Huynh, Hai Le Tran, P. Mai, H. T. Nguyen, L. Nguyen, T. Truong","doi":"10.1590/0104-1428.08120","DOIUrl":"https://doi.org/10.1590/0104-1428.08120","url":null,"abstract":"1National Key Laboratory of Polymer and Composite Materials, Ho Chi Minh City University of Technology – HCMUT, Vietnam National University–Ho Chi Minh City – VNU–HCM, Ho Chi Minh City, Vietnam 2Faculty of Chemical Engineering, Ho Chi Minh City University of Technology – HCMUT, Vietnam National University Ho Chi Minh City VNU–HCM, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam 3Faculty of Materials Technology, Ho Chi Minh City University of Technology HCMUT, Vietnam National University – Ho Chi Minh City VNU–HCM, Ho Chi Minh City, Vietnam","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67119878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Juliana Donato de Almeida Cantalice, E. G. Mazzini Júnior, J. Freitas, Rosanny Christhinny da Silva, R. Faez, L. Costa, A. Ribeiro
Obstract This work provides a convenient strategy for preparation of conducting polycaprolactone (PCL)/polyaniline (PAni) nanofibers, useful for development of optoelectronic sensors and devices. PCL/PAni nanofibers were obtained by electrospinning technique and characterized by SEM, FTIR, thermal analysis, and DC electrical conductivity. The influence of the experimental conditions in the electrospinning process, such as the applied voltage, on the nanofiber morphology was discussed in detail. Incorporation of PAni into PCL nanofibers significantly increased the electrical conductivity from a non-detectable level for the neat PCL to 0.032 ± 0.022 S/cm for the nanofibers containing 7.5 wt.% PAni. Therefore, electrospun PCL/PAni nanofiber mats presented optical and electrical properties, that awaken the possibility of applications for these materials as acid-base sensors and electrochromic
{"title":"Polyaniline-based electrospun polycaprolactone nanofibers: preparation and characterization","authors":"Juliana Donato de Almeida Cantalice, E. G. Mazzini Júnior, J. Freitas, Rosanny Christhinny da Silva, R. Faez, L. Costa, A. Ribeiro","doi":"10.1590/0104-1428.09320","DOIUrl":"https://doi.org/10.1590/0104-1428.09320","url":null,"abstract":"Obstract This work provides a convenient strategy for preparation of conducting polycaprolactone (PCL)/polyaniline (PAni) nanofibers, useful for development of optoelectronic sensors and devices. PCL/PAni nanofibers were obtained by electrospinning technique and characterized by SEM, FTIR, thermal analysis, and DC electrical conductivity. The influence of the experimental conditions in the electrospinning process, such as the applied voltage, on the nanofiber morphology was discussed in detail. Incorporation of PAni into PCL nanofibers significantly increased the electrical conductivity from a non-detectable level for the neat PCL to 0.032 ± 0.022 S/cm for the nanofibers containing 7.5 wt.% PAni. Therefore, electrospun PCL/PAni nanofiber mats presented optical and electrical properties, that awaken the possibility of applications for these materials as acid-base sensors and electrochromic","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67120176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1590/0104-1428.20210005
Roberta Trovão Santos, Nathália Smith Santos, M. A. Oliveira, Fernanda de Andrade Buás Campeão, Maria Aparecida Larrubia Granado Moreira Rodrigues Mandu, M. Marques, L. D. Costa
{"title":"Antimicrobial activity of silver composites obtained from crosslinked polystyrene with polyHIPE structures","authors":"Roberta Trovão Santos, Nathália Smith Santos, M. A. Oliveira, Fernanda de Andrade Buás Campeão, Maria Aparecida Larrubia Granado Moreira Rodrigues Mandu, M. Marques, L. D. Costa","doi":"10.1590/0104-1428.20210005","DOIUrl":"https://doi.org/10.1590/0104-1428.20210005","url":null,"abstract":"","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67120518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1590/0104-1428.20210013
João Miguel Ayres Melillo, I. Pereira, A. C. Mottin, F. Araújo
Fused Filament Fabrication, better known as Fused Deposition Modeling®, is currently the most widespread 3D Printing Technology. There has been a significant demand for developing flame-retardant filaments. Thereby enabling them, for example, in electronics and automotive applications. In this study, commercial PLA filament was modified by the addition of 1, 3 and 5% (%wt.) of expandable graphite. The composites were reprocessed, via extrusion, into filaments for Fused Filament Fabrication. Thermal properties of the filament composites were evaluated by thermogravimetric analysis and differential scanning calorimetry. Mechanical properties of thermo-pressed specimens indicated that no strong adhesion was promoted between the filler and matrix. This is a challenge with expandable graphite reported by many authors. All composites with expandable graphite achieved the V-2 rating of UL-94 flammability test. In spite of this, the results indicated that flammability of the PLA was reduced. All composite filaments were printable and prototypes were successfully 3D printed.
{"title":"Modification of poly(lactic acid) filament with expandable graphite for additive manufacturing using fused filament fabrication (FFF): effect on thermal and mechanical properties","authors":"João Miguel Ayres Melillo, I. Pereira, A. C. Mottin, F. Araújo","doi":"10.1590/0104-1428.20210013","DOIUrl":"https://doi.org/10.1590/0104-1428.20210013","url":null,"abstract":"Fused Filament Fabrication, better known as Fused Deposition Modeling®, is currently the most widespread 3D Printing Technology. There has been a significant demand for developing flame-retardant filaments. Thereby enabling them, for example, in electronics and automotive applications. In this study, commercial PLA filament was modified by the addition of 1, 3 and 5% (%wt.) of expandable graphite. The composites were reprocessed, via extrusion, into filaments for Fused Filament Fabrication. Thermal properties of the filament composites were evaluated by thermogravimetric analysis and differential scanning calorimetry. Mechanical properties of thermo-pressed specimens indicated that no strong adhesion was promoted between the filler and matrix. This is a challenge with expandable graphite reported by many authors. All composites with expandable graphite achieved the V-2 rating of UL-94 flammability test. In spite of this, the results indicated that flammability of the PLA was reduced. All composite filaments were printable and prototypes were successfully 3D printed.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67120541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1590/0104-1428.20210074
Juliana Augusto Molari, D. D. Brunelli
{"title":"ABS/Recycled PCTG blend compatibilized with SBS: effect on mechanical properties and morphology","authors":"Juliana Augusto Molari, D. D. Brunelli","doi":"10.1590/0104-1428.20210074","DOIUrl":"https://doi.org/10.1590/0104-1428.20210074","url":null,"abstract":"","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67121098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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