Polymer science最新文献_第3页

Fabrication and Characterization of NewUnsaturated Terpolyesters Based onDiarylidenecyclohexanone 二芳基环己酮新型不饱和三元聚酯的制备与表征

Polymer science Pub Date : 2017-01-01 DOI: 10.4172/2471-9935.100027

Momen S. A. Abdelaty

引用次数: 1

Decarboxylation Induced Crosslinking: aPromising Method to Improve the Anti CO2 Plasticization of Gas Separation Membranes 脱羧诱导交联:提高气体分离膜抗CO2塑化性能的一种有前途的方法

Polymer science Pub Date : 2017-01-01 DOI: 10.4172/2471-9935.100026

Jie Yan, Pei Li

引用次数: 0

Preparation of Nano Triblock Co-polymer for Desferoxiamine Delivery and Cross-Linked Copolymer for Iron Overload Disease 去铁胺纳米三嵌段共聚物的制备及铁超载病交联共聚物的研究

Polymer science Pub Date : 2017-01-01 DOI: 10.4172/2471-9935.100020

A. Haddad, Iqbal J Al-Asadi, I. Falih

{"title":"Preparation of Nano Triblock Co-polymer for Desferoxiamine Delivery and Cross-Linked Copolymer for Iron Overload Disease","authors":"A. Haddad, Iqbal J Al-Asadi, I. Falih","doi":"10.4172/2471-9935.100020","DOIUrl":"https://doi.org/10.4172/2471-9935.100020","url":null,"abstract":"Some IPNs and copolymer were prepared at different ratios from bisacryl amide as crosslinking agent by Redox polymerization. These IPNs (polyacrylamide –poly ethylene imine); (polyacrylamide-poly electrolyte) and poly (acrylamide-acrylic acid) copolymer are examined by UV-VIS spectrophotometry method to determine their ability for linking with iron ions that are prepared with standard solution employed for this purpose. The results, indicate that the copolymer prepared from (AcAm:AcAc) with 20% (wt/wt) from bisacrylamide has the ability of removing the iron ions from the solution. The swelling ratio for the prepared IPNs and copolymers was studied as a function of time at different pH (1.2, 8.4) and distilled water; the obtained data show that the swelling ratio was increased with increasing the pH. The morphology of copolymers was performed by scanning electron microscopy (SEM) to show the pore size. A new triblock copolymer of (Polylactide-Pluronic127-Polylactide) is synthesized by ring opening polymerization using (DUB) Diazabicyclo-[5.4.0]-udec-7-ene as a catalyst. The triblock copolymer is characterized 1HNMR. Semi IPNs from triblock copolymer with acrylamide was prepared to use as a polymer drug delivery with Desferriox aminemethanesulphate (Iron overload chelating drug). The SEM for this semi IPN shows the nano structure due to the regular orientation of lactide fibers. Desferoxiamine release study as a function of time at pH 1.2 and 8.4 for 24 hours with semi IPNs coated with tetramethylourea and without coating was also carried out. The releasing studies show that the rate of releasing at GIF is larger than SGF.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85757650","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

Axial-Flexural Interaction of Square FRPTube Columns In-Filled with Ultra-HighPerformance Concrete 超高性能混凝土填充方钢管柱轴弯相互作用研究

Polymer science Pub Date : 2017-01-01 DOI: 10.4172/2471-9935.100018

Ridha Ms

{"title":"Axial-Flexural Interaction of Square FRPTube Columns In-Filled with Ultra-HighPerformance Concrete","authors":"Ridha Ms","doi":"10.4172/2471-9935.100018","DOIUrl":"https://doi.org/10.4172/2471-9935.100018","url":null,"abstract":"Membrane fouling leads to increased expenses in the processes in which they are implemented, and this is especially problematic in wastewater treatments. Therefore, fouling minimization and control represents the key to make those processes feasible. In the present paper, a review on the results of fouling control by the critical and threshold flux theories, focusing on olive mill wastewater coming from Spain (OMW-S) and Italy (OMW-I), is briefly covered. In first place, adequate fouling inhibition methods should be designed upstream the membrane operation, in order to make the downstream membrane processes for wastewater treatment technically and economically feasible. The followed strategy allows the operation of the membranes system in a controlled framework that permits the stable operation of the plant. Moreover, the calculated membrane area upon the adoption of feed control (FC) resulted in a requirement for the OMW-S stream of 74.2 and 50.3 m2 for the UF and NF membranes, respectively, whilst 113.1 and 49.7 m2 would be required for the treatment of the OMW-I stream. This also minimizes the membrane plant design, avoiding the common over-dimension wrongly estimated by engineers in order to guarantee sufficient operating autonomy to conduct the process that makes it unfeasible","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81666601","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

Kinetic Study of Thermal Degradationof Polydimethylsiloxane: The Effect ofMolecular Weight on Thermal Stability inInert Atmosphere 聚二甲基硅氧烷热降解动力学研究:分子量对惰性气氛热稳定性的影响

Polymer science Pub Date : 2017-01-01 DOI: 10.4172/2471-9935.100024

A. RuÄigaj, M. Krajnc, U. Šebenik

{"title":"Kinetic Study of Thermal Degradationof Polydimethylsiloxane: The Effect ofMolecular Weight on Thermal Stability inInert Atmosphere","authors":"A. RuÄigaj, M. Krajnc, U. Šebenik","doi":"10.4172/2471-9935.100024","DOIUrl":"https://doi.org/10.4172/2471-9935.100024","url":null,"abstract":"Thermal degradation of polydimethylsiloxane (PDMS) of different molecular weights in inert and oxygen atmosphere is studied and discussed in detail. PDMS samples of different molecular weights were prepared by anionically initiated ring-opening polymerization of octamethylcyclotetrasiloxane in emulsion. The molecular weight of PDMS drastically affected the shape of TGA curve at higher temperatures when thermogravimetric (TGA) measurements were performed in the inert atmosphere. The thermal stability of PDMS decreased with increasing the average molecular weight of the sample, which could be explained by prevailing unzipping mechanism at lower molecular weights over intramolecular and intermolecular redistribution, which were more important at higher molecular weights. On the other hand, experiments in oxygen atmosphere showed zero effect of polydimethylsiloxane molecular weight on its thermal stability. In addition, a kinetic model describing the thermal degradation of PDMS in inert atmosphere as a function of PDMS molecular weight was proposed. The proposed kinetic model was composed of diffusion-limited kinetics step related to evaporation rates of the degradation products and of rate-determined step related to the formation of cyclic degradation products. As a result of mathematical modeling by fitting the calculated data to experimental data kinetic parameters were derived properly.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"433 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76652789","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: 13

Macromolecular Flocculant with theFunction of Trapping Heavy Metals 具有重金属捕集功能的高分子絮凝剂

Polymer science Pub Date : 2017-01-01 DOI: 10.4172/2471-9935.100025

Chang Qing

引用次数: 0

Electronic Transport and AnisotropicConductivity Behavior on PEDOT:PSSNanoribbons and NanostructuringModification by Atomic ForceMicroscope Nanoshaving PEDOT: pss纳米带的电子输运和各向异性电导率行为及原子力显微镜纳米结构修饰

Polymer science Pub Date : 2017-01-01 DOI: 10.4172/2471-9935.100021

Vega O, Wong F, Vega E, Luciano J, Rodriguez S, Pinto Nj, Rosa Lg

引用次数: 2

The Fine Structure Constant, the RydbergConstant and the Planck Constant 精细结构常数，里德伯常数和普朗克常数

Polymer science Pub Date : 2017-01-01 DOI: 10.4172/2471-9935.100028

YinYue Sha