Pub Date : 2022-01-01DOI: 10.1590/0104-1428.20210085
M. A. Goes, J. P. Santos, B. Carvalho
{"title":"Impact of controlled extensional flow during extrusion of PP, PVDF and LDPE","authors":"M. A. Goes, J. P. Santos, B. Carvalho","doi":"10.1590/0104-1428.20210085","DOIUrl":"https://doi.org/10.1590/0104-1428.20210085","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":"67121194","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 : 2022-01-01DOI: 10.1590/0104-1428.20210088
J. J. P. Barros, N. G. Jaques, I. D. S. Silva, A. Albuquerque, A. M. Araújo, R. Wellen
{"title":"Tailoring sustainable compounds using eggshell membrane as biobased epoxy catalyst","authors":"J. J. P. Barros, N. G. Jaques, I. D. S. Silva, A. Albuquerque, A. M. Araújo, R. Wellen","doi":"10.1590/0104-1428.20210088","DOIUrl":"https://doi.org/10.1590/0104-1428.20210088","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":"67121227","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 : 2022-01-01DOI: 10.1590/0104-1428.20210105
C. A. Pintão, Airton Baggio, Lucas Pereira Piedade, L. Sanchez, Gilberto de Magalhães Bento Gonçalves
{"title":"Torsion modulus with CaCO3 fillers in unsaturated polyester resin - mechanical spectroscopy","authors":"C. A. Pintão, Airton Baggio, Lucas Pereira Piedade, L. Sanchez, Gilberto de Magalhães Bento Gonçalves","doi":"10.1590/0104-1428.20210105","DOIUrl":"https://doi.org/10.1590/0104-1428.20210105","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":"67121078","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 : 2022-01-01DOI: 10.1590/0104-1428.20220018
Virnna Cristhielle Santana Barbosa, A. M. F. Sousa, A. L. N. Silva
{"title":"Influence of processing parameters on mechanical and thermal behavior of PLA/PBAT blend","authors":"Virnna Cristhielle Santana Barbosa, A. M. F. Sousa, A. L. N. Silva","doi":"10.1590/0104-1428.20220018","DOIUrl":"https://doi.org/10.1590/0104-1428.20220018","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":"67121696","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 : 2022-01-01DOI: 10.1590/0104-1428.20210093
Mateus da Silva Batista, L. A. Teixeira, Alisson de Souza Louly, Sayra Oliveira Silva, S. Luz
The lack of knowledge about the behavior under creep and fatigue limits the use of polymeric composites reinforced with natural fibers. Thus, this work assessed the behavior of epoxy composites reinforced with sisal fibers under tensile, fatigue, and creep tests. Also, thermogravimetry and scanning electron microscopy assessed the sodium hydroxide (NaOH) treatment efficiency in sisal fibers. Further, differential scanning calorimetry determined the degree of cure of the composites, and stereomicroscopy allowed the evaluation of the surface’s fracture. As a result, the tensile strength of the composite was 1.4 times the value of neat epoxy resin after 100,000 cycles in the fatigue test. Moreover, when loaded with 20% of the maximum tensile strength, it is estimated that the composite resists 200,000 h without rupturing by creep. To conclude, the efficient adhesion between sisal fibers and epoxy obtained by NaOH treatment allowed good mechanical behavior to the epoxy composite.
{"title":"Fatigue damage propagation and creep behavior on sisal/epoxy composites","authors":"Mateus da Silva Batista, L. A. Teixeira, Alisson de Souza Louly, Sayra Oliveira Silva, S. Luz","doi":"10.1590/0104-1428.20210093","DOIUrl":"https://doi.org/10.1590/0104-1428.20210093","url":null,"abstract":"The lack of knowledge about the behavior under creep and fatigue limits the use of polymeric composites reinforced with natural fibers. Thus, this work assessed the behavior of epoxy composites reinforced with sisal fibers under tensile, fatigue, and creep tests. Also, thermogravimetry and scanning electron microscopy assessed the sodium hydroxide (NaOH) treatment efficiency in sisal fibers. Further, differential scanning calorimetry determined the degree of cure of the composites, and stereomicroscopy allowed the evaluation of the surface’s fracture. As a result, the tensile strength of the composite was 1.4 times the value of neat epoxy resin after 100,000 cycles in the fatigue test. Moreover, when loaded with 20% of the maximum tensile strength, it is estimated that the composite resists 200,000 h without rupturing by creep. To conclude, the efficient adhesion between sisal fibers and epoxy obtained by NaOH treatment allowed good mechanical behavior to the epoxy composite.","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":"67121316","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 : 2022-01-01DOI: 10.1590/0104-1428.20210102
Janis Schutte Nunes, E. N. Ito, Cléverson Fernandes Senra Gabriel, Thiago Castro Lopes, R. Nunes
{"title":"Physical-mechanical behavior of nitrile rubber-synthetic mica nanocomposites","authors":"Janis Schutte Nunes, E. N. Ito, Cléverson Fernandes Senra Gabriel, Thiago Castro Lopes, R. Nunes","doi":"10.1590/0104-1428.20210102","DOIUrl":"https://doi.org/10.1590/0104-1428.20210102","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":"67121007","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 : 2022-01-01DOI: 10.1590/0104-1428.20210031
R. Rendón-Villalobos, M. A. Lorenzo-Santiago, Roberto Olvera-Guerra, C. A. Trujillo-Hernández
{"title":"Bioplastic composed of starch and micro-cellulose from waste mango: mechanical properties and biodegradation","authors":"R. Rendón-Villalobos, M. A. Lorenzo-Santiago, Roberto Olvera-Guerra, C. A. Trujillo-Hernández","doi":"10.1590/0104-1428.20210031","DOIUrl":"https://doi.org/10.1590/0104-1428.20210031","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":"67120735","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 : 2022-01-01DOI: 10.1590/0104-1428.20220020
F. D. Adewumi, L. Lajide, E. Adewole, Jonanthan Abidemi Johnson
{"title":"Synthesis and characterization of native and modified bitter yam starch grafted with acrylonitrile","authors":"F. D. Adewumi, L. Lajide, E. Adewole, Jonanthan Abidemi Johnson","doi":"10.1590/0104-1428.20220020","DOIUrl":"https://doi.org/10.1590/0104-1428.20220020","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":"67121808","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 : 2022-01-01DOI: 10.1590/0104-1428.20210114
Karina Luzia Andrade, H. Ramlow, J. Floriano, E. D. Acosta, F. Faita, R. Machado
{"title":"Latex and natural rubber: recent advances for biomedical applications","authors":"Karina Luzia Andrade, H. Ramlow, J. Floriano, E. D. Acosta, F. Faita, R. Machado","doi":"10.1590/0104-1428.20210114","DOIUrl":"https://doi.org/10.1590/0104-1428.20210114","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":"67121840","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 : 2022-01-01DOI: 10.1590/0104-1428.210018
F. Lima, Luis Felipe Matos, Isnayra Kerolaynne Carneiro Pacheco, F. Reis, J. Câmara, J. Pierote, José Milton Matos, Alessandra A. Ribeiro, W. Moura, Ana Cristina Fialho
e Química Fina, Universidade Católica Portuguesa, Porto, Portugal *jvfrazao92@hotmail.com Obstract To analyze the biocompatibility of the scaffold produced from a natural polymer derived from castor oil through hemolytic activity and antimicrobial activity, to enable the clinical application. Three in vitro tests were performed: Hemolytic activity test - Polymer partially dissolved in contact with blood agar; Hemolytic activity test in sheep’s blood - Polymer extract with red blood cells solution; Antimicrobial activity test - Solid polymer in direct contact with E. Coli and S. Aureus. For hemolytic tests, none of the samples showed hemolysis. Negative hemolytic activity is a good indicator, as the maintenance of the blood clot in the area of the lesion is essential for the formation of new tissue. For the antimicrobial activity test, no significant activity was observed against the bacteria used. The polymer is not toxic to red blood cells, being
e Química Fina, Universidade Católica portuesa, Porto, Portugal *jvfrazao92@hotmail.com摘要通过对蓖麻油衍生的天然聚合物制备的支架的溶血活性和抗菌活性进行生物相容性分析，为其临床应用奠定基础。进行了三项体外试验:溶血活性试验——与血琼脂接触部分溶解的聚合物;绵羊血液溶血活性试验。红细胞溶液聚合物提取物抗菌活性试验-与大肠杆菌和金黄色葡萄球菌直接接触的固体聚合物。对于溶血试验，没有样品显示溶血。阴性溶血活性是一个很好的指标，因为维持病变区域的血凝块对新组织的形成至关重要。对于抗菌活性试验，没有观察到对所用细菌的显著活性。这种聚合物对红细胞没有毒性，因为
{"title":"Scaffold based on castor oil as an osteoconductive matrix in bone repair: biocompatibility analysis","authors":"F. Lima, Luis Felipe Matos, Isnayra Kerolaynne Carneiro Pacheco, F. Reis, J. Câmara, J. Pierote, José Milton Matos, Alessandra A. Ribeiro, W. Moura, Ana Cristina Fialho","doi":"10.1590/0104-1428.210018","DOIUrl":"https://doi.org/10.1590/0104-1428.210018","url":null,"abstract":"e Química Fina, Universidade Católica Portuguesa, Porto, Portugal *jvfrazao92@hotmail.com Obstract To analyze the biocompatibility of the scaffold produced from a natural polymer derived from castor oil through hemolytic activity and antimicrobial activity, to enable the clinical application. Three in vitro tests were performed: Hemolytic activity test - Polymer partially dissolved in contact with blood agar; Hemolytic activity test in sheep’s blood - Polymer extract with red blood cells solution; Antimicrobial activity test - Solid polymer in direct contact with E. Coli and S. Aureus. For hemolytic tests, none of the samples showed hemolysis. Negative hemolytic activity is a good indicator, as the maintenance of the blood clot in the area of the lesion is essential for the formation of new tissue. For the antimicrobial activity test, no significant activity was observed against the bacteria used. The polymer is not toxic to red blood cells, being","PeriodicalId":20282,"journal":{"name":"Polimeros-ciencia E Tecnologia","volume":"79 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67124663","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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