Polymer science最新文献_第4页

Behavior Classification Physical/ChemistryPA66/HC Binary System Utilized to ObtainSeparation Membranes 用物理/化学双体系制备分离膜

Polymer science Pub Date : 2016-04-14 DOI: 10.4172/2471-9935.100004

M. Zeni, J. Duarte, V. D. Santos

引用次数: 0

The pH Dependence on the Rheology ofWheat Protein Isolate Suspensions pH值对小麦分离蛋白悬浮液流变性的影响

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100005

Jingyuan Xu, B. Carson, Sanghoon Kim

{"title":"The pH Dependence on the Rheology ofWheat Protein Isolate Suspensions","authors":"Jingyuan Xu, B. Carson, Sanghoon Kim","doi":"10.4172/2471-9935.100005","DOIUrl":"https://doi.org/10.4172/2471-9935.100005","url":null,"abstract":"Linear and non-linear rheological properties of wheat protein isolate (WPI) suspensions were investigated as a function of concentration and pH. Linear dynamic viscoelastic properties for WPI were strongly dependent on concentration and pH. The higher the concentration, the stronger the viscoelasticity of the WPI would be. In the pH range of 4.0-7.0, higher pH resulted in stronger viscoelasticity. WPI suspensions exhibited viscoelastic fluid behavior at lower concentration and/or lower pH. However, at high concentration and high pH, WPI suspensions showed some transition from viscoelastic fluid into viscoelastic solid, and displayed viscoelastic solid behavior at low frequencies. Concentration and pH ranges for the transition were narrow indicating that the property change for the WPI was in evidence. The non-linear shear viscoelastic properties of WPI were also found to depend on concentration and pH. Viscosities of WPI displayed shear-thinning behavior, and fits by a power law constitutive model. Our results indicate that the WPI structure in suspension changes over a small concentration and pH range, which suggest that WPI could be important for adjusting and controlling dough viscoelastic behavior. The information of this work is useful in the development of more and new applications using wheat protein isolate.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74440349","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

Effects of Surfactant Aggregation and Adsorption on Steel Corrosion Inhibition in Salt Solution 表面活性剂在盐溶液中聚集和吸附对钢的缓蚀作用

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100002

Yakun Zhu, Michael L FreeM

引用次数: 6

Research on Natural Fiber Polymer Composites: The WayForward 天然纤维聚合物复合材料的研究进展

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100001

Sapuan Sm

引用次数: 0

Flocculation Effect of Macromolecule 高分子絮凝作用

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100013

Q. Chang

{"title":"Flocculation Effect of Macromolecule","authors":"Q. Chang","doi":"10.4172/2471-9935.100013","DOIUrl":"https://doi.org/10.4172/2471-9935.100013","url":null,"abstract":"Citation: Chang Q. Flocculation Effect of Macromolecule. Polym Sci. 2016, 2:1. In the early years, it was found that colloidal dispersions can be made more sensitive to precipitation by the addition of small quantities of macromolecules. These macromolecules are referred to as flocculants currently. The macromolecular flocculants commonly used in early time are polyelectrolytes. Their flocculation mechanism is considered to be the simple charge neutralization. If the charges of macromolecular ions are opposite to that of particles, flocculation and precipitation will take place. But in the later period, it has been discovered that some non-ionic macromolecules, even the macromolecules with the same charge as the colloidal particle have sensitive or flocculation effect. Therefore, neutralization is not the only mechanism of their flocculation. Now we think long-chain additives, such as gelatin, can sometimes bring about a rather loose flocculation by a bridging mechanism in which the molecules are adsorbed with part of their chain on two or more particles. Such flocculation normally occurs over a narrow range of additive concentrations; at higher concentration protective action is obtained, since bridging can occur only under conditions where the remaining particles still have empty surface, thus further adsorption of the additive is possible.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87223970","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

Role of Polymers as Gelling Agents in the Formulation of Emulgels 聚合物作为胶凝剂在乳液配方中的作用

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100010

Madhavi Latha Samala, G. Sridevi

{"title":"Role of Polymers as Gelling Agents in the Formulation of Emulgels","authors":"Madhavi Latha Samala, G. Sridevi","doi":"10.4172/2471-9935.100010","DOIUrl":"https://doi.org/10.4172/2471-9935.100010","url":null,"abstract":"Background: The present review focuses on the critical piece of different polymers as gelling experts in the enumerating of emulgels. The concentrate moreover accomplishes the novel procedure for availability and appraisal parameters of emulgels. Methods: Late advances for the conscious use of gelling administrators in arrangement of various emulgels are consolidated. A variety of new polymers are evolving these days which are showing multi works basically as thickening agents and emulsifying agents. The new polymers have remarkable property of gellation that is useful in the formulation of stable dispersed systems. Research and overview works of various specialists were altogether considered and joined into the present study. Findings: Types, uses, method of preparation and a few evaluation tests for emulgels are given in this review. The use of gelling agents either alone or in combination in various emulgel formulations were also represented. Conclusions: The application of various gelling agent polymers in emulgel preparation and their numerous advantages provides the formulation scientists the wide choice of polymers for use in other pharmaceutical formulations. The favourable physical and rheological properties of emulgels with greater shelf life and better patient compliance than other delivery systems are useful in the formulation of topical dosage forms","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90040447","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: 19

Preparation of PDMS/PVDF Composite Pervaporation Membrane Modified with Hydrophobic TiO2 Nanoparticles for Separating Formaldehyde Solution 疏水性TiO2纳米粒子修饰PDMS/PVDF复合渗透蒸发膜的制备及其对甲醛分离的影响

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100012

Danjie Shi, Pei Li, B. Cao

{"title":"Preparation of PDMS/PVDF Composite Pervaporation Membrane Modified with Hydrophobic TiO2 Nanoparticles for Separating Formaldehyde Solution","authors":"Danjie Shi, Pei Li, B. Cao","doi":"10.4172/2471-9935.100012","DOIUrl":"https://doi.org/10.4172/2471-9935.100012","url":null,"abstract":"In this paper, polydimethylsiloxane (PDMS) was blended with hydrophobic TiO2 nanoparticles and then coated on top of the polyvinylidene fluoride (PVDF) ultrafiltration membrane to form the (PDMS/TiO2)/PVDF composite membrane. The structure, morphology and physical property of the composite membrane were characterized by FTIR, SEM, contact angle measurement, and dry-wet swelling degree test. The TiO2 was uniformly distributed in the PDMS matrix, and the composite membrane showed higher affinity to formaldehyde than water. The membrane was used to separate the 1000 ppm formaldehyde water solution through a pervaporation (PV) process. The results showed that the membrane could selectively permeate formaldehyde over water and the best separation performance could be achieved at 50°C with a separation factor of 11.25, and a total flux of 187.72 g·m-2·h-1, which were better than the pristine PDMS/PVDF membrane with separation factor of 10.66 and total flux of 115.52 g·m-2·h-1. Hence, adding TiO2 not only increased the membrane flux, but also increased the separation factor of the composite membrane. This study showed that pervaporation technology had the potential for treating formaldehyde wastewater.","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77285826","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: 7

Preparation of Microcellulose (Mcc) and Nanocellulose (Ncc) from Eucalyptus Kraft Ssp Pulp 桉木硫酸盐浆制备微纤维素和纳米纤维素

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100007

M. Zeni, Diana Favero, K. Pacheco, A. Mc

引用次数: 23

Pervaporation: An Emerging Technology for Desalination 渗透蒸发:一种新兴的海水淡化技术

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100014

Pei Li

引用次数: 6

Natural Rubber and Reclaimed Rubber CompositesâA Systematic Review 天然橡胶和再生橡胶复合材料:系统综述

Polymer science Pub Date : 2016-01-01 DOI: 10.4172/2471-9935.100015

P. Mente, Motaung Te, Hlangothi Sp

{"title":"Natural Rubber and Reclaimed Rubber CompositesâA Systematic Review","authors":"P. Mente, Motaung Te, Hlangothi Sp","doi":"10.4172/2471-9935.100015","DOIUrl":"https://doi.org/10.4172/2471-9935.100015","url":null,"abstract":"This paper is a review on the tensile, curing, viscoelastic, morphology and thermal properties of natural fiber reinforced rubber composites and reclaimed rubber. Natural fibers have lately become attractive to researchers, engineers and scientists as another reinforcement for fiber reinforced polymer composites. Owing to their low cost, fairly good mechanical properties, and high specific strength, non-abrasiveness, eco-friendly and bio-degradability characteristics. They are exploited as a replacement for the conventional fibers, such as glass, aramid and carbon. The tensile properties of natural fiber reinforce polymers (both thermoplastics and thermosets) are mainly influenced by the interfacial adhesion between the matrix and the fibers. Several chemical modifications are employed to improve the interfacial matrix–fiber bonding resulting in the enhancement of tensile properties of the composites. In all polymers, natural rubber received a growing attention due to mainly abundance and applications in rubber industries. Given the environmental problems as a results of industrial waste, recent studies seemed to have focused more into reclaimed rubber and recycling thereof, which is dominated by end-of-life-tires. This review would cover the aspects of reclaimed rubber as well, which is the rubber recovered from de-vulcanization of a wasted rubber","PeriodicalId":20346,"journal":{"name":"Polymer science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81119936","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: 35