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: 10.1590/0104-1428.20220018
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: 10.1590/0104-1428.20210105
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: 10.1590/0104-1428.20210031
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: 10.1590/0104-1428.20210102
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: 10.1590/0104-1428.20210093
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: 10.1590/0104-1428.20210116
M. A. Goes, J. P. Santos, B. Carvalho
The use of controlled extension flows associated with processing with predominant shear flows can bring gains in the dispersive capacity of nanofillers during the processing of nanocomposites. In this work, we use a controlled flow device coupled to the matrix of a single-screw extruder to process PP matrix composites containing 0.5% and 2.5% (v/v) of MWCNT. The nanocomposites were evaluated by optical microscopy and oscillatory rheological analysis. The clusters size analysis showed that in PP/0.5MWCNT-el, 70.5% of all its clusters were below 1µm 2 while its analog processed without the extensional flow showed 59.8% of its clusters below this value. The rheological analysis allowed to verify that the compositions processed with the presence of the extensional flow have their crossover frequencies shifted to lower values, that is, longer relaxation times corroborating that improved degrees of dispersion were achieved.
在纳米复合材料的加工过程中，利用以剪切流为主的可控扩展流可以提高纳米填料的分散能力。在这项工作中，我们使用一个与单螺杆挤出机的基体耦合的控制流量装置来加工含有0.5%和2.5% (v/v) MWCNT的PP基复合材料。通过光学显微镜和振荡流变学分析对纳米复合材料进行了表征。聚簇大小分析表明，在PP/0.5MWCNT-el中，70.5%的聚簇小于1 μ m 2，而未经拉伸流处理的模拟物中，59.8%的聚簇小于该值。流变分析可以验证，在拉伸流存在的情况下处理的组分，其交叉频率转移到较低的值，即更长的松弛时间，证实了分散度的改善。
{"title":"Improving the dispersion of multiwalled carbon nanotube in polypropylene using controlled extensional flow","authors":"M. A. Goes, J. P. Santos, B. Carvalho","doi":"10.1590/0104-1428.20210116","DOIUrl":"https://doi.org/10.1590/0104-1428.20210116","url":null,"abstract":"The use of controlled extension flows associated with processing with predominant shear flows can bring gains in the dispersive capacity of nanofillers during the processing of nanocomposites. In this work, we use a controlled flow device coupled to the matrix of a single-screw extruder to process PP matrix composites containing 0.5% and 2.5% (v/v) of MWCNT. The nanocomposites were evaluated by optical microscopy and oscillatory rheological analysis. The clusters size analysis showed that in PP/0.5MWCNT-el, 70.5% of all its clusters were below 1µm 2 while its analog processed without the extensional flow showed 59.8% of its clusters below this value. The rheological analysis allowed to verify that the compositions processed with the presence of the extensional flow have their crossover frequencies shifted to lower values, that is, longer relaxation times corroborating that improved degrees of dispersion were achieved.","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":"67121522","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}
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