Polymer science最新文献

{"title":"Characterization of Electrospinning Parameters of Chitosan/Poly(vinyl alcohol) Nanofibers to Remove Phenol via Response Surface Methodology","authors":"Abdolmaleki Ay, H. Zilouei, S. Khorasani","doi":"10.4172/2471-9935.100033","DOIUrl":"https://doi.org/10.4172/2471-9935.100033","url":null,"abstract":"Fabrication and characterization of chitosan/PVA electrospun nanofibers for adsorption of phenol from water was investigated. The effects of voltage (15-30 kv), solution injection flow rate (0.5-1.5 mL-1 h), distance of needle and collector (10-20 cm) and chitosan/poly(vinyl alcohol) volumetric ratio (25/75, 50/50, 75/25) were studied to obtain the optimum electrospinning conditions for the maximum adsorption capacity of phenol. Central composite design (CCD) from statgraphics software was used to investigate and optimize the processing factors for production of chitosan/poly(vinyl alcohol) nanofibers from aqueous solutions. The nanofibers were characterized using SEM, FTIR, XRD and TGA. Uniform beadless nanofibers with the minimum diameters of 3-11 nm and 6-18 nm were obtained before and after crosslinking process respectively. The optimum parameters of electrospinning for maximum phenol adsorption achieved at chitosan/PVA ratio of 50/50, voltage of 30 kV, distance of 20 cm, and injection flow rate of 1.48 mL h-1. FTIR spectrum of chitosan/PVA exhibited the existence of relevant functional groups of both PVA, chitosan in the blends. XRD pattern that both chitosan and PVA are crystalline in nature and show sharp peaks corresponding to 2θ=20° and 41.68. TGA analysis shows that destruction temperature of adsorbent is about 200°C.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83159500","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}

{"title":"Preparation of LDPE/EVA/PE-MA, Nano Clay Blend Composite in the Stage Potassium Sorbate (KS) and Garlic Oil (GO) as an Antimicrobial Substance","authors":"Z. Farazi, A. Oromiehie, Mou Sm, Hashem Sa","doi":"10.4172/2471-9935.100034","DOIUrl":"https://doi.org/10.4172/2471-9935.100034","url":null,"abstract":"In this study the using of antimicrobial substances and nanoparticles can increase the shelf living and on the other hand, keep from the addition of preservatives in food products. This material for putting in parcels is taken into account one of the active putting into technology. In this undertaking, low-density polyethylene was selected because of elasticity, transparency, low melting point and simple reversible process. After that, ethylene vinyl acetate copolymer (EVA), needing payment to adhesion condensation getting in the way of and product transparence properties and the polyethylene graft copolymer with maleic anhydride (PE-G-MA) as a thing making adjustment was used in the first stage. At the second was added to mixture LDPE/EVA/PE-MA. At the third stage, the Clay nanoparticles (NC) was used in the rules to make of a mixture having in it GO. Brabbndr twin-screw extruder was used to process the examples. The mechanical testing, sending (power and so on) electron microscopy (TEM), X diffraction (XRD), water absorption, water vapor, permeability, oxygen permeability and microbial permeability of films produced was taken. The outcome of the above test showed that mechanical properties of the mixture LDPE/EVA/PE-MA than clear LDPE has got well. On the other hand, the mixture having in it GO had the nearest properties to the said mixture and films having in it GO+NC got well mechanical properties, too. The outcome XRD, TEM put into orders for computer the sheet structure. The physical properties of water absorption showed that films having in it GO and GO+NC hare lower water absorption made a comparison to other examples. The outcome of water vapor and oxygen permeability tests indicated that films having in it GO+NC hare more getting in the way of properties than other examples. at last, the outcome of microbial test that was guided for a month, showed that examples having in it antimicrobial substances hare oppose against the growth of small-scale- organisms, in the event that, the motion picture existence without of antimicrobial substances against the growth of micro-organisms did not play or amusement any stopping effect.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86847900","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}

{"title":"Study of Electrical Properties of Nickel Doped Polyurethane Nanocomposites","authors":"P. GangaRajuAchary, B. Munisha, S. Singhdeo, P. Ks","doi":"10.4172/2471-9935.100035","DOIUrl":"https://doi.org/10.4172/2471-9935.100035","url":null,"abstract":"Isophorene diisocyanate and polyethylene glycol are taken in 1.2:1 ratio to prepared pure polyurethane (PU) polymer. The nickel nanoparticles are added into pure polyurethane matrix to synthesize PU/Ni (25%) nanocomposites. The formation of pure polyurethane and nickel-polyurethane nano-composites were confirmed FTIR spectra. The variation of temperature on some electrical properties (i.e. tangent loss, electrical modulus, ac conductivity, Nyquist plots etc.) of the nanocomposites has produced some interesting results useful for device applications. The electrical properties of pure polyurethane have drastically changed due to addition of nickel nanoparticles (as filler) in the polymer. The increasing tendency of ac conductivity and high tangent loss make nickelpolyurethane nano-composites as smart materials and very useful for energy storage, biomaterials and shape memory.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91012357","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}

{"title":"Synthesis and Characterization of Biocompatible Polyesteramides: PNOBDME (C34H38N2O6)n and PNOBEE (C26H22N2O6)n as Cholesteric Liquid Crystals","authors":"M. P. Méndez","doi":"10.4172/2471-9935.100037","DOIUrl":"https://doi.org/10.4172/2471-9935.100037","url":null,"abstract":"New polyesteramides, poly[oxy(1,2-dodecane)-oxy-carbonyl-1,4-phenylene-aminecarbonyl-1,4-phenylene-carbonyl-amine-1,4-phenylene-carbonyl]: (C34H38N2 O6 ) n , named PNOBDME, and poly[oxy(1,2-buthylene)-oxy-carbonyl-1,4-phenylene-amine-carbonyl1,4-phenylene-carbonyl-amine-1,4-phenylene-carbonyl]: [C26H22N2 O6 ) n , named PNOBEE, have been designed and synthetized as cholesteric liquid crystal. Both have been fully characterized by 1 H and 13C-NMR, COSY and HSQC and compared to their precursor polyesters PTOBDME and PTOBEE. The thermal behaviour of the new compounds is studied by TG and DSC analysis. Their optical activity is evaluated by optical rotatory dispersion (ORD). Molecular models of the new polymer show helical polymeric chains. Morphology of the samples is also reported by ESEM. The synthetic cholesteric liquid crystal polyestereamides described here have proved to be biocompatible and to act as non-viral vectors in Gene Therapy, transfecting DNA to the nucleus cell.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79098290","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}

{"title":"In situ Catalytic Bulk Copolymerization of Maleate Surfmer-Methyl Methacrylate Using TiO2 and V2O5 at Different Conditions","authors":"S. Solyman, E. A. Elsharaky, Amira E. El-Tabey","doi":"10.4172/2471-9935.100031","DOIUrl":"https://doi.org/10.4172/2471-9935.100031","url":null,"abstract":"Non-ionic Maleate surfmer (M1) prepared via ring opening reaction of maleic anhydride followed by esterfaction with polyethylene glycol. Surfmer was homopolymerized and copolymerized with methyl methacrylate (M2) at different conditions using TiO2 and V2O5 as catalysts in presence of O2 or N2. The chemical structure of the prepared surfmer was confirmed by FTIR, 13C and 1HNMR. The produced copolymers was also confirmed and characterized by Gel Permeation Chromatography (GPC) after cleaning polymers. Also, thermal gravimetric analysis (TGA) indicated higher thermal stability for M1M2TN and M1M2VO composites relative to pure PMMA. Scanning and transmission electron microscope (SEM and TEM) for PMMA and M1M2TN may confirm homogeneous and controlled enchainment of M1-M2 copolymer using TiO2 at the optimum conditions. The polymer conversion% was calculated and discussed. The optimum conditions resulted in 64.2% and 63.8% conversion using 20% TiO2 in N2 and 10% V2O5 in O2 respectively at 80°C after 4h with M1/M2 molar ratio of 1:1.The interfacial tension properties for the prepared surfmer and its copolymer was evaluated.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79813048","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}

{"title":"Structure and Water Characteristics of N-isopropylacrylamide-based Polymer/Polyurethane Resin Films","authors":"M. Enomoto, Y. Omote, Mitsuo Miyajima, C. Yun","doi":"10.4172/2471-9935.100032","DOIUrl":"https://doi.org/10.4172/2471-9935.100032","url":null,"abstract":"Context: Moisture-permeable waterproof materials are used in fields such as sports to provide comfort. In this study, we investigated moisture-permeable waterproof film materials exhibiting temperature-sensitive hydrophilicity for application in agriculture, industry, and sports. Objective: By combining water-soluble poly(N-isopropylacrylamide) (poly-NIPAM) with hydrophilic polyurethane (PU), we investigated whether the resultant copolymer films can be used as moisture-permeable waterproof materials with good potential applications. Methods: We copolymerized water-soluble poly-NIPAM, which was synthesized beforehand as a diol, with PU, and studied whether the resulting poly-NIPAM/PU copolymer films were water-insoluble. Results: We confirmed that water-soluble poly-NIPAM and hydrophilic PU were combined through PU links. In terms of physical properties, we verified that the films had indeed become water-insoluble. Furthermore, from the relationship between the film’s water swelling ratio and water temperature, we observed that the film exhibited temperature-sensitive hydrophilicity, with the water swelling ratio changing across the LCST. For films absorbing water at different temperatures, the drying rate was different across the LCST. Conclusions: From these results, we confirmed that a functional film with temperature-dependent hydrophilicity was achieved. This property enabled the poly-NIPAM/PU copolymerized films to be used as moisture-permeable waterproof fabrics for sportswear.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73671491","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}

{"title":"The Effect of Modified PVA Interfacial Layer Doped by Zn Nanoparticles on the Electrical Parameters of Au/N-4H Sic (MS) Structures","authors":"Alma Mh, A. Kökçe, H. E. Lapa, A. Özdemir, S. Altındal","doi":"10.4172/2471-9935.100030","DOIUrl":"https://doi.org/10.4172/2471-9935.100030","url":null,"abstract":"Both Au/n-4H SiC (MS) and Au/(Zn doped-PVA)/n-4H SiC (MPS) structures were fabricated by using the same wafer. This effect of modified PVA interlayer doped by Zn nanoparticles on main electrical parameters, such as ideality factor (n), barrier height (BH), series resistance (Rs), and rectification rate (RR) were evaluated and investigated by using the current-voltage (I-V) data measurements. Furthermore, the energy dependent profile of surface states (Nss) was also obtained from these data by taking into account voltage dependent BH and n. The sources of observed negative capacitance (NC) at the accumulation region for the MS and MPS structures were also evaluated. From capacitance-voltage (C-V) and conductancevoltage (G/ω-V) data measurements, the profile of Rs and Nss were also evaluated and investigated as voltage dependent at high frequency (1 MHz) by using Nicollian-Brews technique. These results explain how is the effect of modified PVA interfacial layer doped by Zn nanoparticles on increasing in the RR and decreasing of the values of Rs, Nss, and leakage current of MPS structure as compared with MS structure. Thus, we can say that this increase in the performance of the MPS structure is a result of the grown of the (Zn-doped PVA) layer between Au and n-4H SiC.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91095958","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}

{"title":"Recycling of Post-Consumer Goods Considering New Approaches on Polymer Identification","authors":"Grigore Me, M. Ladaniuc, P. Simona-Florentina, S. Doncea, R. Stoica, D. Dimonie","doi":"10.4172/2471-9935.100029","DOIUrl":"https://doi.org/10.4172/2471-9935.100029","url":null,"abstract":"The paper reveals as novelty that, in view of mechanical recycling, the identification of polymer from blends melt processed as various goods, must considered combined methods for determine those physical properties which highlight the main differences between the thermoplastic polymers. The FTIR and DSC analyzes associated with measuring the density and melt flow index of materials, proved to be a good method to identify the polyolefins from blends which were melt processed as films for food packages. The DSC thermogrames must be recorded after removing the material’s thermal history which changes the thermal behavior of each polymer.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86865810","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}

{"title":"Formulation and evaluation of oral mucosal casein salt film for the anti-diabetic activity","authors":"Ebru Basaran","doi":"10.4172/2471-9935-C1-002","DOIUrl":"https://doi.org/10.4172/2471-9935-C1-002","url":null,"abstract":"","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90705640","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}

{"title":"Hot melt extrusion: An emerging drug delivery technology","authors":"Rashid Mahmood","doi":"10.4172/2329-6631-C1-022","DOIUrl":"https://doi.org/10.4172/2329-6631-C1-022","url":null,"abstract":"","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"278 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82817051","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}