发布求助
文献互助 智能选刊 最新文献

Polimeros-ciencia E Tecnologia最新文献

筛选
英文 中文
Electrospun PHBV nanofiber containing Tea Tree Oil: physicochemical and antimicrobial activity 含茶树油的电纺丝PHBV纳米纤维:理化及抗菌活性
IF 1.3 4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2023-04-14 DOI: 10.1590/0104-1428.20220088
V. R. Santos, Samara Domingues Vera, G. L. Cena, A. P. Silva, A. P. Lemes, Katia Conceição, D. Tada, Alexandre Luiz Souto Borges, E. S. Trichês
{"title":"Electrospun PHBV nanofiber containing Tea Tree Oil: physicochemical and antimicrobial activity","authors":"V. R. Santos, Samara Domingues Vera, G. L. Cena, A. P. Silva, A. P. Lemes, Katia Conceição, D. Tada, Alexandre Luiz Souto Borges, E. S. Trichês","doi":"10.1590/0104-1428.20220088","DOIUrl":"https://doi.org/10.1590/0104-1428.20220088","url":null,"abstract":"Aiming to produce an antimicrobial dressing for wound healing applications, in this work Tea Tree oil (TTO) was incorporated into PHBV nanofibers by absorption. It was observed increase in the nanofiber diameter due to 5% TTO absorption efficiency, which also led to a 54% decrease in the contact angle. The releasing assay indicates a 6.8% oil release in the first 24 h – being probably the oil deposited at the polymer surface – followed by a minimal release at 48 h. The set of antimicrobial assays performed suggests the incorporation of TTO optimized the antimicrobial activity of the polymer for E. coli and C. albicans , while against S. aureus no significant difference was observed. The MTT assay showed no cytotoxicity of PHBV, but the incubation of L929 fibroblast cells with PHBV-TTO reduced cell viability. Overall, the PHBV nanofibers containing TTO present great potential as an antimicrobial dressing.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67122685","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}
引用次数: 0
Effects of replacing Carbon Black with Wood Fibers in wood-rubber composites 木纤维替代炭黑在木胶复合材料中的应用效果
IF 1.3 4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2023-04-14 DOI: 10.1590/0104-1428.20220051
Renan Zunta Raia, S. Iwakiri, R. Trianoski, A. S. D. Andrade, Edemir Luiz Kowalski, A. Job, F. Paiva
{"title":"Effects of replacing Carbon Black with Wood Fibers in wood-rubber composites","authors":"Renan Zunta Raia, S. Iwakiri, R. Trianoski, A. S. D. Andrade, Edemir Luiz Kowalski, A. Job, F. Paiva","doi":"10.1590/0104-1428.20220051","DOIUrl":"https://doi.org/10.1590/0104-1428.20220051","url":null,"abstract":"The objective of this research was to develop a more sustainable composite and still keep its characteristics. Fibers treated with NaOH at 5% w/w for 2 hours were incorporated into natural rubber in different proportions (0 phr, 24 phr, 36 phr, 48 phr and 60 phr). The mechanical properties of the composites suffered changes, increasing the hardness, young’s modulus and decreasing its tensile strength. All the physical properties were not statistically different. The coloration became less dark in the WF60/CB0 treatment, and the electrical properties presented better resistivity with the increase in the concentration of fibers in the composite. This presents a possibility of using WF for the production of wood-rubber composites for the production of rubber artifacts which do not require high rolling resistance. Based on the results from this research, we recommended the WF24/CB36 mix to produce antistatic floors.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67122158","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}
引用次数: 0
Poly(methyl methacrylate) modified Starch: their preparations, properties and applications 聚甲基丙烯酸甲酯变性淀粉的制备、性能及应用
IF 1.3 4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2023-04-14 DOI: 10.1590/0104-1428.20220068
Anjana Dhar, J. Barman, H. Talukdar, D. Haloi
{"title":"Poly(methyl methacrylate) modified Starch: their preparations, properties and applications","authors":"Anjana Dhar, J. Barman, H. Talukdar, D. Haloi","doi":"10.1590/0104-1428.20220068","DOIUrl":"https://doi.org/10.1590/0104-1428.20220068","url":null,"abstract":"Plastic wastes are generally not easily degradable under the action of environmental components. They are very much resistant to microbial attack too. These non-biodegradable plastics accumulate over a longer period of time on earth leading to environmental pollution. However, this may be avoided by using biodegradable polymers. Thus the demand for the preparation of biodegradable polymers has grown up. In recent years, researchers have developed a few biodegradable polymers from renewable sources; those find a large application in the field of packaging, agriculture, and biomedical fields. Starch is one such biopolymer, modification of which may lead to a semi-synthetic polymer with good properties with an edge of biodegradability. Poly(methyl methacrylate) is a good modifying agent for such modification as revealed by the literature search. This review report summarizes the preparation of such poly(methyl methacrylate) grafted starch polymers via different physical and chemical methods, their properties, and their applications.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"54 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67121994","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}
引用次数: 0
Separation of plastic mixtures by sink-float combined with froth flotation 沉浮—泡沫浮选联合分离塑料混合物
4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2023-01-01 DOI: 10.1590/0104-1428.20220094
Fernando Pita
{"title":"Separation of plastic mixtures by sink-float combined with froth flotation","authors":"Fernando Pita","doi":"10.1590/0104-1428.20220094","DOIUrl":"https://doi.org/10.1590/0104-1428.20220094","url":null,"abstract":"The aim of this research was to separate a mixture of six post-consumer plastics (PS, PMMA, PVC-D, PVC-M, PET-D and PET-S) by combination of sink-float separation and froth flotation.. In sink-float method two mediums of separation were used: sodium chloride water solution and ammonium nitrate water solution. Sink-float method allowed complete separation of the less dense plastic (PS) from intermediate density plastics (PMMA and PVC-D) and from high density plastics (PET-S, PET-D and PVC-M); also allowed good separation of intermediate density plastics (PMMA and PVC-D) from high density plastics (PVC-M, PET-D and PET-S) with an efficiency close to 100%. Separation of PVC-M from PET-D and PET-S by sink-float method led to fair results allowing a separation efficiency of about 60%. Since PMMA and PVC-D have similar density, their separation was achieved by froth flotation, using sodium lignosulfonate as selective wetting agent of PVC-D, with a separation efficiency of 85%.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134884506","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}
引用次数: 0
Sustainable composites of eco-friendly polyethylene reinforced with eggshells and bio-calcium carbonate 可持续复合材料的环保聚乙烯增强与蛋壳和生物碳酸钙
4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2023-01-01 DOI: 10.1590/0104-1428.20220108
Kássia Peçanha Vieira, Alexandra Augusta Reichert, Gabriel Monteiro Cholant, Dielen Marin, Cesar Augusto Gonçalves Beatrice, Amanda Dantas de Oliveira
{"title":"Sustainable composites of eco-friendly polyethylene reinforced with eggshells and bio-calcium carbonate","authors":"Kássia Peçanha Vieira, Alexandra Augusta Reichert, Gabriel Monteiro Cholant, Dielen Marin, Cesar Augusto Gonçalves Beatrice, Amanda Dantas de Oliveira","doi":"10.1590/0104-1428.20220108","DOIUrl":"https://doi.org/10.1590/0104-1428.20220108","url":null,"abstract":"This work aimed to obtain and analyze composite materials made from green polyethylene and calcium carbonate extracted from chicken eggshells. The shells were collected and prepared for later extraction of calcium carbonate. With the X-ray diffraction analysis it was possible to confirm that both the in natura reinforcement and the calcined one, have the same polymorph mineral (calcite). With regard to thermal behavior, compounds with in natura reinforcement showed greater mass loss due to the moisture contained in them. The results showed a significant increase in Young’s moduli of the composites compared to the pure polymer. The scanning electron microscopy showed good dispersion and adhesion between the reinforcement materials and matrix. In view of the results, eggshells have the potential to be used as fillers, where greater rigidity is required. Since these materials come from a waste material, with low cost, their use becomes even more viable.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135213112","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}
引用次数: 0
Development and characterization of chitosan-collagen films loaded with honey 载蜜壳聚糖-胶原膜的研制与表征
4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2023-01-01 DOI: 10.1590/0104-1428.20230031
David Servín de la Mora-López, Tomás Jesús Madera-Santana, Jaime López-Cervantes, Dalia Isabel Sánchez-Machado, Jesús Fernando Ayala-Zavala, Herlinda Soto-Valdez
{"title":"Development and characterization of chitosan-collagen films loaded with honey","authors":"David Servín de la Mora-López, Tomás Jesús Madera-Santana, Jaime López-Cervantes, Dalia Isabel Sánchez-Machado, Jesús Fernando Ayala-Zavala, Herlinda Soto-Valdez","doi":"10.1590/0104-1428.20230031","DOIUrl":"https://doi.org/10.1590/0104-1428.20230031","url":null,"abstract":"Biomaterials developed with biopolymers contribute to the healing process of healthy or diabetic patients. The objective of the present study was to evaluate the effect of honey incorporation (0.3, 0.6, and 1.2 g/100 mL) in chitosan/collagen/glycerol composite films. The Ch/Coll/1.2H films revealed the greatest percentage of elongation (27.10%) and Young´s modulus (65.58 MPa). The barrier properties (WVTR and WVP) exhibited a significant increase when the honey was incorporated into the films. The absorption capacity, solubility, and enzymatic biodegradability were lower in films containing honey. The chemical interactions between the functional groups of the films were verified by FTIR. The morphology studied by SEM confirmed the mixture’s homogeneity. Finally, all formulations exhibited antibacterial properties against Staphylococcus aureus, Pseudomonas aeruginosa, Listeria monocytogenes, and Salmonella Typhimurium. The aforementioned properties of formulated dressings are suitable for their potential application in chronic wounds.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135212868","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}
引用次数: 0
Development and characterization of green polyethylene/clay/antimicrobial additive nanocomposites 绿色聚乙烯/粘土/抗菌添加剂纳米复合材料的研制与表征
IF 1.3 4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2022-01-01 DOI: 10.1590/0104-1428.20210097
Priscylla Jordânia Pereira de Mesquita, T. S. Alves, R. Barbosa
{"title":"Development and characterization of green polyethylene/clay/antimicrobial additive nanocomposites","authors":"Priscylla Jordânia Pereira de Mesquita, T. S. Alves, R. Barbosa","doi":"10.1590/0104-1428.20210097","DOIUrl":"https://doi.org/10.1590/0104-1428.20210097","url":null,"abstract":"In this work, nanocomposites were developed and evaluated using high-density bio polyethylene (BPEAD)/Cloisite 20A (3 and 6%)/commercial antimicrobial additive (0,5 and 1%) containing 1% of zinc pyrithione dispersed in vinyl acetate (EVA). The samples were prepared in a single screw extruder using the melt intercalation technique and then by flat extrusion to obtain the films. X-ray diffraction (XRD) showed an increase in basal spacing and exfoliation of the structure of some films. The Fourier Transform Infrared Spectroscopy (FTIR) analysis illustrated the main functional groups for BHDPE and EVA. Thermal analysis indicated that BHDPE degradation did not change with organoclay addition, but crystallinity increased. The mechanical properties showed an increase in the elastic modulus and a decrease in maximum tensile strength. This work contributes to the development and improvement of the natural properties of BHDPE in order to enlarge its applications.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67121440","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}
引用次数: 0
Influence of carbon black trimodal mixture on LDPE films properties: Part1 - DOE 炭黑三模态混合物对LDPE薄膜性能的影响:第一部分- DOE
IF 1.3 4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2022-01-01 DOI: 10.1590/0104-1428.20220039
J. Barbosa, C. G. Beatrice, L. Pessan
{"title":"Influence of carbon black trimodal mixture on LDPE films properties: Part1 - DOE","authors":"J. Barbosa, C. G. Beatrice, L. Pessan","doi":"10.1590/0104-1428.20220039","DOIUrl":"https://doi.org/10.1590/0104-1428.20220039","url":null,"abstract":"In this study, the influence of carbon black (CB) trimodal mixture, with different medium particle sizes, on the colorimetric and rheological properties of polyethylene was evaluated. Three different types of CB were selected, with particle sizes of 15nm (S), 38nm (M), and 75nm (L) and combined, generating a Design of Experiments (DOE) with 19 formulations to be dispersed at 30% in low density polyethylene (LDPE) in twin screw extruder. Such formulations were evaluated in performance and process properties, such as Tint Strength, Melt Flow Index (MFI), and Total Transmittance (TT). It was observed that the mixtures between small (S) and medium (M) particles developed greater tinting strength and lower viscosity, demonstrating the synergy of the mixture, which was superior in the performance of the mixture containing only a particular of 15nm (S) that would have greater potential for results.","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67122040","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}
引用次数: 0
Potential antioxidant migration from polyethylene packaging to food: a systematic review 从聚乙烯包装到食品的潜在抗氧化剂迁移:系统综述
IF 1.3 4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2022-01-01 DOI: 10.1590/0104-1428.20220081
Mayara de Simas Mesquita, S. Abrantes
{"title":"Potential antioxidant migration from polyethylene packaging to food: a systematic review","authors":"Mayara de Simas Mesquita, S. Abrantes","doi":"10.1590/0104-1428.20220081","DOIUrl":"https://doi.org/10.1590/0104-1428.20220081","url":null,"abstract":"","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67122203","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}
引用次数: 0
Obtaining and characterization of bioplastics based on potato starch, aloe, and graphene 基于马铃薯淀粉、芦荟和石墨烯的生物塑料的制备和表征
IF 1.3 4区 化学
Polimeros-ciencia E Tecnologia Pub Date : 2022-01-01 DOI: 10.1590/0104-1428.20220084
Mercedes Puca Pacheco, Oscar Rafael Tinoco Gómez, G. C. Escamilla, Santiago Duarte Aranda, M. Velázquez
{"title":"Obtaining and characterization of bioplastics based on potato starch, aloe, and graphene","authors":"Mercedes Puca Pacheco, Oscar Rafael Tinoco Gómez, G. C. Escamilla, Santiago Duarte Aranda, M. Velázquez","doi":"10.1590/0104-1428.20220084","DOIUrl":"https://doi.org/10.1590/0104-1428.20220084","url":null,"abstract":"","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67122272","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}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信