Journal of Research Updates in Polymer Science最新文献_第5页

Low-Density Polyethylene Nanocomposite Containing Zn/Ti Layered Double Hydroxide 含锌/钛层状双氢氧化物的低密度聚乙烯纳米复合材料

Journal of Research Updates in Polymer Science Pub Date : 2021-02-26 DOI: 10.6000/1929-5995.2021.10.5

S. Jaerger, Daiane Nogueira, Douglas Santos de Oliveira, M. V. Machado, R. Marangoni

引用次数: 1

Introduction to the Study of Mechanical Properties of Terpolymer PP/EPDM Mixtures 聚丙烯/三元乙丙橡胶共混物力学性能研究简介

Journal of Research Updates in Polymer Science Pub Date : 2021-02-26 DOI: 10.6000/1929-5995.2021.10.1

S. Scagliusi, Elizabeth C.L. Carvalho, A. B. Lugão

{"title":"Introduction to the Study of Mechanical Properties of Terpolymer PP/EPDM Mixtures","authors":"S. Scagliusi, Elizabeth C.L. Carvalho, A. B. Lugão","doi":"10.6000/1929-5995.2021.10.1","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.1","url":null,"abstract":": Thermoplastic elastomers (TPEs), based in PP (Polypropylene) / EPDM (Ethylene Propylene Diene Monomer) have as purpose improving PP resistance and impact, aiming to a more comprehensive use in automotive market, among edifications, construction and packaging sectors, due to their recyclability properties. PP is a commodity, with a high melting point, high mechanical resistance and low density, posing a balance between physical and mechanical properties; in addition, it shows an easy processing, at low cost. In order to minimize this deficiency, EPDM, an impact modifier, can be used. Nevertheless, most of polymeric blends are incompatible and immiscible, i.e., show a mutual and limited solubility and in most of cases, a high interfacial tension. However, there is a relatively low interfacial tension (force which acts on transformation of a continuous structure in a dispersion) between PP and EPDM (approximately 0.3 mN.m -1 ), reducing the rate of breakup and facilitating the build-up of a continuous structure. This work aims to the study of compatibility of PP and EPDM blends and variation of mechanical properties, emphasizing that many properties of thermoplastic elastomers can be processed according with conventional thermoplastics methods: herein, PP/EPDM blends, 90/10, 80/20, 70/30 and 50/50 were characterized according to: Mechanical essays, Differential Scanning Calorimetry, Thermogravimetric Analyses, Melt Flow Index, Izod Impact Strength and Dynamic mechanical Analyses.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79134739","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}

引用次数: 0

The Effect of Aluminium Surface Treatments on the Bonding Properties of Silica-Modified Epoxy Adhesive Joints: A Statistical Approach 铝表面处理对硅改性环氧胶粘剂接头粘合性能的影响:统计学方法

Journal of Research Updates in Polymer Science Pub Date : 2021-02-26 DOI: 10.6000/1929-5995.2021.10.3

Francisco M. dos Santos, L. A. Oliveira, A. Bueno, R. Freire, Leandro José da Silva, G. Pino, T. Panzera

引用次数: 0

Effect of Ionizing Radiation Applied to PLA Used as Compatibilizing Agent in Reinforced eGG Shell PBAT/PLA Bio-Based Composites 电离辐射对聚乳酸增容剂在增强蛋壳PBAT/PLA生物基复合材料中的作用

Journal of Research Updates in Polymer Science Pub Date : 2021-02-26 DOI: 10.6000/1929-5995.2021.10.4

E. Cardoso, D. F. Parra, S. Scagliusi, L. G. H. Komatsu, A. B. Lugão

{"title":"Effect of Ionizing Radiation Applied to PLA Used as Compatibilizing Agent in Reinforced eGG Shell PBAT/PLA Bio-Based Composites","authors":"E. Cardoso, D. F. Parra, S. Scagliusi, L. G. H. Komatsu, A. B. Lugão","doi":"10.6000/1929-5995.2021.10.4","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.4","url":null,"abstract":": Bio-filler from eggshells as reinforcement of bio-based polymers are based on their benefits as adequate strength and stiffness, besides friendly, degradable and renewable environment. Eggshell is an agricultural waste considered as garbage, contributing to pollution; nevertheless, it can be transformed into bio-calcium carbonate, acquiring new values. As biodegradable polymers, there were chosen PLA (poly-lactic-acid) and PBAT (butylene adipate co-terephthalate), thermoplastics capable to be processed via conventional methods. PLA is a linear, aliphatic thermoplastic polyester, high in strength and modulus, but brittle. PBAT is a synthetic polymer, very flexible, based on fossil resources with high elongation at break, but low strength. It will be required the use of compatibilizers, for reducing interfacial tension exhibited by PLA/PBAT immiscible blend, considering their extreme glass transition temperatures: 62 o C for PLA and – 30 o C for PBAT. Herein it was used ionizing radiation for inducing compatibilization by free radicals, improving dispersion and adhesion of blend phases, without using chemical additives, at room temperature. PLA, acting as compatibilizer, was previously e-beam and gamma radiated, at 150 kGy. PBAT/PLA 50/50 blend with 15 phr of bio- filler from avian eggs 125 µ m particle size and both compatibilizers were homogeneized in a co-rotating twin-screw extruder, within a temperature profile 120 to 145 o C, from hopper to die. Characterization involved: Differential Scanning Calorimeter, Thermogravimetric Analyses, Fourier Transform Infrared Spectroscopy, Wide Angle X-Ray Diffraction, Tensile Strength and Elongation at Break.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74721792","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}

引用次数: 0

Processing Characterization of Sisal/Epoxy Prepregs 剑麻/环氧预浸料的工艺表征

Journal of Research Updates in Polymer Science Pub Date : 2021-02-26 DOI: 10.6000/1929-5995.2021.10.6

Sayra Oliveira Silva, L. A. Teixeira, A. Gontijo, S. Luz

{"title":"Processing Characterization of Sisal/Epoxy Prepregs","authors":"Sayra Oliveira Silva, L. A. Teixeira, A. Gontijo, S. Luz","doi":"10.6000/1929-5995.2021.10.6","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.6","url":null,"abstract":": Quality control to obtain composite laminates is frequently applied to synthetic fibers/epoxy prepregs. The gel time test, resin, volatiles and fiber content, drape measurement and tack tests together with water absorption capacity are methods currently employed. However, for natural fibers prepregs there is a gap in the literature, which makes their application difficult. Thus this work will investigate sisal fibers, which have low cost, high biodegradability and low specific weight, following the common methods to manufacture composites from natural fibers/epoxy prepregs. First, the prepregs were prepared by hand lay-up, aligning the fibers with epoxy, keeping 15% by weight content of fiber. After the quality control characterization, 3 mm thickness composite was prepared by using a press, and tensile tests and scanning electron microscopy (SEM) were applied. As a result, the resin fraction values and the solid content of the matrix showed little variation between the different samples. The natural fibers prepregs absorbed water quickly in the initial stage until reaching the saturation level. The NaOH-treated sisal/epoxy prepreg had a tension of 71.06 ± 8.28 kPa for the tack test and tensile strength of 69.24 ± 11.69 MPa. Finally, the NaOH-treated sisal 15 wt%/epoxy resulted in composites with a better performance than the neat epoxy resin. There was good adhesion between the fibers and matrix, as confirmed by SEM and mechanical tests.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86202747","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}

引用次数: 2

Influence of Hybridization on Mechanical Properties and Water Absorption in Jute and Jute /E-Glass Reinforced Composites 杂化对黄麻及黄麻/ e -玻璃增强复合材料力学性能和吸水性的影响

Journal of Research Updates in Polymer Science Pub Date : 2021-02-26 DOI: 10.6000/1929-5995.2021.10.2

V. Lacerda, Salvador n Barbalho, Zip Code Brazil Ba, A. R. Conceição, Catarina da N. Scherer, Michel G. Santos, M. Leao

{"title":"Influence of Hybridization on Mechanical Properties and Water Absorption in Jute and Jute /E-Glass Reinforced Composites","authors":"V. Lacerda, Salvador n Barbalho, Zip Code Brazil Ba, A. R. Conceição, Catarina da N. Scherer, Michel G. Santos, M. Leao","doi":"10.6000/1929-5995.2021.10.2","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.2","url":null,"abstract":"The use of composite materials is increasingly present not only in several industrial areas but also in daily life. With the escalating environmental concern, it is necessary the search for materials that prove to be ecologically sustainable and economically viable. Vegetable fibers have been presenting themselves as an excellent alternative, however, because their disadvantage of having a high moisture absorption capacity, the introduction of synthetic fibers, forming hybrid composites, is a good solution since it combines the characteristics of both types of reinforcements. The present research aims to carry out a comparative study between two types of laminated polymer composites, one reinforced with Jute fibers and the other hybrid, composed of Jute and E-glass fibers. The mechanical performances of the composites submitted to the Uniaxial Tensile, Three-point Flexural and Shear tests were evaluated, as well as fracture analyzes. A comparative study to analyze the influence of hybridization on moisture absorption was carried out. The results showed that the hybridized composite showed an increase in the elastic modulus, as well as in its resistance to flexion and shear, which shows the formation of a more rigid material. Hybridization also changed the moisture content of the composite.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83345007","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}

引用次数: 0

A Review on Carbon Nanotubes: Preparation, Properties and Applications 碳纳米管的制备、性能及应用研究进展

Journal of Research Updates in Polymer Science Pub Date : 2020-12-30 DOI: 10.6000/1929-5995.2020.09.10

Md Nur Karim, M. Patwary, S. Abedin, Md Riaj Hossen, Md Saifur Rahman

引用次数: 1

Effect of Molybdenum Trioxide in the Behavior of Poly(vinyl alcohol) Nanocomposites Systems Focusing New Systems for Protection against COVID-19 三氧化钼对聚乙烯醇纳米复合材料性能的影响聚焦新型COVID-19防护体系

Journal of Research Updates in Polymer Science Pub Date : 2020-12-30 DOI: 10.6000/1929-5995.2020.09.09

M. Tavares, J. C. D. Filho, Tais Nascimento, G. Iulianelli, Pedro Paulo Merat

{"title":"Effect of Molybdenum Trioxide in the Behavior of Poly(vinyl alcohol) Nanocomposites Systems Focusing New Systems for Protection against COVID-19","authors":"M. Tavares, J. C. D. Filho, Tais Nascimento, G. Iulianelli, Pedro Paulo Merat","doi":"10.6000/1929-5995.2020.09.09","DOIUrl":"https://doi.org/10.6000/1929-5995.2020.09.09","url":null,"abstract":"The purpose of this work was to study the molecular dynamics, morphology, mechanical and thermal performance of nanomaterials formed by poly(vinyl alcohol) and molybdenum trioxide (PVA/MoO3) obtained through solution casting method, focusing new materials with therapeutic applications since the molybdenum trioxide exhibit an excellent antibacterial activity and could be a pathway to prevent viruses. The obtaining materials were characterized by conventional techniques as X-ray diffraction, thermogravimetric and dynamical-mechanical analysis. The unconventional low-field NMR relaxometry was used to evaluate the molecular dynamic and morphology of these systems. The results obtained showed that the MoO3 addition into PVA matrix promote an increase on the thermal stability at higher temperatures and a progressive increase on the rigidity of the PVA systems. Also changes in the molecular mobility of nanomaterials determined through the proton spin-lattice relaxation time showed that low proportion of molybdenum trioxide increased the intercalation of the poly(vinyl alcohol) chains between oxide lamellae while higher quantity of molybdenum trioxide caused an inverse effect on the oxide lamellae delamination. From those results the nanomaterials presented a mixed structural organization as intercalated and exfoliated morphologies. According to these first results, the nanocomposites obtained promise to be antimicrobial and antiviral agent to prevent COVID-19 and similar viruses.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78676506","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}

引用次数: 1

Interaction of Lipase with Lipid Model Systems 脂肪酶与脂质模型系统的相互作用

Journal of Research Updates in Polymer Science Pub Date : 2020-12-21 DOI: 10.6000/1929-5995.2020.09.08

S. Zaitsev, I. S. Zaitsev, I. Milaeva

{"title":"Interaction of Lipase with Lipid Model Systems","authors":"S. Zaitsev, I. S. Zaitsev, I. Milaeva","doi":"10.6000/1929-5995.2020.09.08","DOIUrl":"https://doi.org/10.6000/1929-5995.2020.09.08","url":null,"abstract":"The aim of this work was to study the interaction of lipases (as an important biopolymer) with models of biomembranes based on the phospholipid and cholesterol. Lipases (triacylglycerolacyl hydrolases) are widely distributed enzymes and well-known by their hydrolytic activity. The study of the lipase interactions with lipid vesicles in aqueous dispersions is of fundamental and practical interest. The pure phosphatidylcholine from egg yolk (ePC) and cholesterol (Chol) were obtained from Sigma-Aldrich. Lipase was obtained from hog pancreas. Measurements of the current and equilibrium surface tension (ST and eST) values were carried out using a BPA-1P device and ADSA program. The particle sizes in the prepared colloidal solutions were determined by the method of dynamic light scattering. An addition of lipase led to some decrease both, of ST and eST for the samples of ePC:Chol (in the ratios from19:1 to 1:1). The mean particle diameter (MPD) and effective particle diameter (EPD) values for the samples of ePC:Chol changed drastically by lipase addition. The EPD/MPD ratios increased from 1.7 to 2.0, from 1.8 to 2.6, from 2.3 to 6.5, from 1.5 to 2.9 for the samples of ePC:Chol at the ratios of 19:1, 14:1, 9:1, 7:1, respectively by lipase concentration increase. This general tendency can be explained by strong interaction of lipase with lipid membrane that leads to the formation of the mixed particles ePC:Chol:lipase with more narrow particle size distribution as compared to the initial EPD/MPD ratio (for the ePC:Chol mixture without lipase).","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76184519","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}

引用次数: 0

A Review on the Physicochemical and Biological Aspects of the Chitosan Antifungal Activity in Agricultural Applications 壳聚糖在农业上抗真菌活性的理化生物学研究进展

Journal of Research Updates in Polymer Science Pub Date : 2020-12-11 DOI: 10.6000/1929-5995.2020.09.07

C. Velásquez, L. R. Avelizapa

{"title":"A Review on the Physicochemical and Biological Aspects of the Chitosan Antifungal Activity in Agricultural Applications","authors":"C. Velásquez, L. R. Avelizapa","doi":"10.6000/1929-5995.2020.09.07","DOIUrl":"https://doi.org/10.6000/1929-5995.2020.09.07","url":null,"abstract":"The antifungal activity of the chitosan biopolymer has been extensively studied for several decades. However, the mechanisms of action associated with this process have not been fully clarified yet. To a large extent, this situation is due to the lack of systematization with which, in general terms, the subject has been approached. However, it seems to have begun to change in recent years with the appearance of several papers reviewing the accumulated knowledge on the beneficial effects shown by chitosan in agricultural applications and putting forward it in a more systematic mode. In this work, the most relevant mechanisms of action proposed for chitosan regarding its antifungal activity will be briefly presented, i.e., disruption and changes in the fungal plasma membrane, alteration of gene expression, inhibition of RNA and protein synthesis, Ca2+ channel blocker, to then address the main factors that influence this antifungal activity, observed mainly in studies focused on phytopathogenic species, which have been grouped into three main blocks: those related exclusively to the chitosan molecules, those associated to the fungal itself and those having to do with the environment where the processes take place. Additionally, a brief section addressing some possibilities on which future studies on this topic should focus is also included.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74984307","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}

引用次数: 3