scholarly journals High-temperature resistant water-soluble polymers derived from exotic amino acids

RSC Advances ◽  
2020 ◽  
Vol 10 (62) ◽  
pp. 38069-38074
Author(s):  
Sumant Dwivedi ◽  
Aniruddha Nag ◽  
Shigeki Sakamoto ◽  
Yasuyoshi Funahashi ◽  
Toyohiro Harimoto ◽  
...  
Keyword(s):  
Amino Acids ◽  
High Temperature ◽  
High Performance ◽  
Water Soluble ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Wide Range ◽  
Soluble Polyimide ◽  
Engineering Materials

High-performance water-soluble polymers have a wide range of applications from engineering materials to biomedical plastics. This article discusses the synthesis of water-soluble polyimide from bio-based monomers.

A Novel Versatile Process for the Production of Polymer Foams

1998 ◽  
Vol 550 ◽  
Author(s):  
V.P. Shastri ◽  
I. Martin ◽  
R. Langer
Keyword(s):  
Water Soluble ◽  
Wound Dressings ◽  
High Porosity ◽  
Polymer Foams ◽  
Polymer Foam ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Great Utility ◽  
Wide Range ◽  
Short Time

AbstractPorous polymeric media are used in several applications such as solid supports for separations and catalysis, as well as biomedical applications such as vascular grafts and wound dressings. We have developed a novel versatile process to produce polymeric cellular solids. This process which is based on a phase extraction-co-polymer precipitation is applicable to a wide range of polymer systems including water soluble polymers. It is capable of yielding polymer foams of high porosity (> 90%) and excellent mechanical characteristics in a very short time (less than 2 hours) without limitations in foam thickness. Polymer foam with such characteristics have great utility in tissue engineering applications. We have successfully explored polymer foams of biocompatible polymers produced by the presented approach for bone and cartilage engineering using bone marrow stromal cells.

scholarly journals Cyclodextrin Multicomponent Complexes: Pharmaceutical Applications

Pharmaceutics ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1099
Author(s):  
Virginia Aiassa ◽  
Claudia Garnero ◽  
Marcela R. Longhi ◽  
Ariana Zoppi
Keyword(s):  
Amino Acids ◽  
Pharmaceutical Industry ◽  
Drug Effects ◽  
Water Soluble ◽  
Therapeutic Drug ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Pharmaceutical Applications ◽  
Auxiliary Substance ◽  
Acids And Bases

Cyclodextrins (CDs) are naturally available water-soluble cyclic oligosaccharides widely used as carriers in the pharmaceutical industry for their ability to modulate several properties of drugs through the formation of drug–CD complexes. The addition of an auxiliary substance when forming multicomponent complexes is an adequate strategy to enhance complexation efficiency and to facilitate the therapeutic applicability of different drugs. This review discusses multicomponent complexation using amino acids; organic acids and bases; and water-soluble polymers as auxiliary excipients. Special attention is given to improved properties by including information on the solubility, dissolution, permeation, stability and bioavailability of several relevant drugs. In addition, the use of multicomponent CD complexes to enhance therapeutic drug effects is summarized.

Polymer-Modified Calcium-Aluminate Macro Defect Free (MDF) Cements

2019 ◽  
Vol 957 ◽  
pp. 311-318 ◽  
Author(s):  
Raffaella Dell’Aversano
Keyword(s):  
High Performance ◽  
Standard Form ◽  
Ceramic Materials ◽  
Water Soluble ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Brittle Behavior ◽  
Complex Forms ◽  
Ductile Behavior ◽  
Cement Strength

Cementitious Macro Defect Free (MDF) materials can be obtained in complex forms with high performance making these materials suitable for applications in many sectors. The low water to cement ratio, w/c, and the saturation of voids by means of water soluble polymers allows increasing the cement strength. However, in their standard form these materials show both the sensitivity typical of water-soluble polymers, presenting a low glass transition temperature (Tg), and the brittle behavior typical of ceramic materials and therefore low toughness. The aim of this work is to modify with various techniques the standard formulation of MDF materials by modulating toughness from a brittle to a ductile behavior. In addition, the effect of the recipes modifications will be analyzed by comparing the rheological characteristics along the processing stages.

Chemical Characterization Problems of Water-Soluble Polymers

1981 ◽  
Vol 21 (06) ◽  
pp. 721-730 ◽  
Author(s):  
D.A. Tyssee ◽  
O.J. Vetter
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Water Soluble ◽  
Polymer Chemistry ◽  
Petroleum Reservoir ◽  
Polymer Backbone ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
The Past ◽  
Analytical Procedures

Abstract Water-soluble polymers are being used increasingly in oil, gas, and geothermal production. Applications include drilling, stimulation, workover and completion, and reservoir flooding fluids. The development of polymers and their application has been mostly empirical. Such a course of development was suitable in the past. However, empirical techniques do not satisfy present and future needs which include (1) the cost/performance relationship and (2) environmental effects associated with expanding polymer application. Therefore, a more thorough understanding of the polymer chemistry is required.The first step in doing this is to develop laboratory methods to characterize these complex materials and their degradation products. The problems are (1) understanding polymer chemistry under field conditions and (2) developing analytical procedures. These problems emerged dramatically during analysis of recent fracture stimulation of some geothermal wells. An involved study of the potential analytical methods was conducted. Polysaccharides were used for the actual field fracture jobs as well as for the analytical procedures. Correlations were made between the total organic content and carbohydrate content of the return waters as a function of residence time under simulated reservoir conditions. Preliminary indications are that more sophisticated information can be obtained by the use of emerging analytical techniques such as high pressure liquid chromatography (HPLC).Advantages gained from use of these methods and others are discussed. Introduction A variety of polymers are used in the petroleum industry for drilling, workover, and completion fluids. Many of these polymers can be used in the geothermal industry for similar applications. However, because the environment of a geothermal reservoir may be drastically different from that of a petroleum reservoir, it is critical that these polymers be investigated under conditions that simulate geothermal environments. In the past, physical property measurements of aqueous solutions of these polymers have been emphasized - particularly fluid rheology both for petroleum and, to a lesser extent, geothermal applications. These physical properties, which are valuable in selecting polymers or polymer blends for use, can be related to the chemical properties of the polymers. Properties such as molecular weight distribution and macrostructure, molecular conformation, side-chain structure, composition of the monomer units comprising the polymer backbone, chemical interactions in the make-up water, chemical and thermal stability, etc., play an important role in determining the ultimate physical properties of the polymer in solutions.Many of these chemical features have been overlooked, and the development of polymers for field applications has followed a strictly empirical course. This empiricism has led to a great deal of confusion when polymers must be selected for field use. A more serious drawback has been the lack of new polymer types - largely because little is known about how the physical properties desired can be related to polymer chemistry. This can be traced for the most part to the lack of chemical methods available in the past to characterize the polymers chemically in sufficient detail. The high-temperature requirements of geothermal applications impose severe limitation on the fracture polymers, particularly their performance and chemical stability under high-temperature conditions. SPEJ P. 721^

scholarly journals Application of Water-Soluble Polymers for Extraction Separation of Amino Acids of Various Structures

2015 ◽  
Vol 12 (12) ◽  
pp. 1032-1041
Author(s):  
Nadezhda Yakovlevna Mokshina ◽  
Dmitry Vladimirovich Bykovskiy ◽  
Gennadiy Valentinovich Shatalov ◽  
Oksana Anatolievna Pakhomova
Keyword(s):  
Amino Acids ◽  
Water Soluble ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Extraction Separation
Sign in / Sign up

Export Citation Format

Share Document