scholarly journals Highly Soluble Fluorinated Polyimides Synthesized with Hydrothermal Process towards Sustainable Green Technology

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3824
Author(s):  
Juheon Lee ◽  
Seungho Baek ◽  
Jinsu Kim ◽  
Sangrae Lee ◽  
Jinyoung Kim ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Organic Solvents ◽  
Hydrothermal Process ◽  
Green Technology ◽  
Synthetic Methods ◽  
Daily Lives ◽  
Fluorinated Polyimides ◽  
Thermal Imidization ◽  
Lower Temperature ◽  
Toxic Organic Solvents

Polyimides, a widely used engineering plastic, require use of large amounts of toxic and hazardous organic solvents which threaten our daily lives, calling for new and easy synthetic methods for sustainable environmentally friendly development. In this paper, highly soluble fluorinated polyimides based on 4,4′-(hexafluoroisopropylidene) diphthalic anhydride were synthesized via hydrothermal process without using any toxic organic solvents and the advantages of the newly demonstrated synthetic methods are shown by comparative analysis performed with the two conventional synthetic methods using organic solvent: thermal and chemical imidization. Lower temperature is required (~200 °C) compared to thermal imidization and functional groups for high fusibility formed more easily compared to chemical imidization. According to the comparative analysis, hydrothermally synthesized PIs showed excellent solubility and maintained high thermal stability (>500 °C) and glass transition temperature (>300 °C) compared to conventional PI. The hydrothermally synthesized polyimide is much more convenient to store and manage than other form of polyimide which is much more stable when it is exposed to humidity as it is a powder form. The hydrothermal synthetic method is verified to be a “Green” and facile method for sustainable PI synthesis.

Synthesis and Properties of Organosoluble and Transparent Fluorinated Aromatic Polyimides

2011 ◽  
Vol 391-392 ◽  
pp. 888-893
Author(s):  
Yun Hua Lu ◽  
Zhi Zhi Hu ◽  
Yong Fei Wang ◽  
Qing Xu Fang
Keyword(s):  
Molecular Structure ◽  
Thermal Properties ◽  
Organic Solvents ◽  
Aromatic Polyimides ◽  
Fluorinated Polyimides ◽  
Thermal Imidization

In this paper, we mainly investigated the properties of fluorinated polyimides film materials. Two aromatic dianhydrides, PMDA and ODPA were poly-condensed with four fluorinated diamines to prepare fluorinated polyimides by the two-step thermal imidization process. The properties of these polyimides were characterized by IR, TGA and UV-vis instrument. The organosolublility of these polyimides was tested in various organic solvents, such as NMP, DMF, DMAc. In addition, the effect of monomers’ molecular structure on the optical, soluble and thermal properties of these polyimides was also studied.

Transition-Metal-Free Synthetic Strategies for the Cross-Coupling Reactions in Water: A Green Approach

2020 ◽  
Vol 07 ◽  
Author(s):  
Tanmay Chatterjee ◽  
Nilanjana Mukherjee
Keyword(s):  
Transition Metal ◽  
Organic Solvents ◽  
Aqueous Media ◽  
Cross Coupling ◽  
Transition Metal Catalysts ◽  
Synthetic Methods ◽  
Coupling Reactions ◽  
Organic Transformations ◽  
Green Approach ◽  
Dehydrogenative Coupling

Abstract: A natural driving force is always working behind the synthetic organic chemists towards the development of ‘green’ synthetic methodologies for the synthesis of useful classes of organic molecules having potential applications. The majority of the essential classes of organic transformations, including C-C and C-X (X = heteroatom) bond-forming crosscoupling reactions, cross dehydrogenative-coupling (CDC) mostly rely on the requirement of transition-metal catalysts and hazardous organic solvents. Hence, the scope in developing green synthetic strategies by avoiding the use of transitionmetal catalysts and hazardous organic solvents for those important and useful classes of organic transformations is very high. Hence, several attempts are made so far. Water being the most abundant, cheap, and green solvent in the world; numerous synthetic methods have been developed in an aqueous medium. In this review, the development of transitionmetal- free green synthetic strategies for various important classes of organic transformations such as C-C and C-X bondforming cross-coupling, cross dehydrogenative-coupling, and oxidative-coupling in an aqueous media is discussed.

Transient color changes in oxidative-stable fluorinated polyimide film for flexible display substrates

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57339-57345 ◽  
Author(s):  
Yooseong Yang ◽  
Youngsuk Jung ◽  
Myung Dong Cho ◽  
Seung Geol Lee ◽  
Soonchul Kwon
Keyword(s):  
Optical Properties ◽  
Polyimide Film ◽  
Flexible Display ◽  
Color Changes ◽  
Fluorinated Polyimide ◽  
Fluorinated Polyimides ◽  
Thermal Imidization ◽  
Yellow Index

Stable optical properties of high transmittance and low yellow index, which are required for a polyimide film as a flexible display substrate could be affected by thermal imidization even in oxidative-stable fluorinated polyimides.

scholarly journals Transforming Suzuki–Miyaura Cross-Couplings of MIDA Boronates into a Green Technology: No Organic Solvents

2013 ◽  
Vol 135 (47) ◽  
pp. 17707-17710 ◽  
Author(s):  
Nicholas A. Isley ◽  
Fabrice Gallou ◽  
Bruce H. Lipshutz
Keyword(s):  
Organic Solvents ◽  
Green Technology

Comparative Analysis of Efficient Platforms

2015 ◽  
pp. 342-361
Author(s):  
Khawaja Tehseen Ahmed ◽  
Mazhar Ul-Haq ◽  
Arsalaan Ahmed Shaikh ◽  
Raihan ur Rasool
Keyword(s):  
Comparative Analysis ◽  
Programming Languages ◽  
Daily Lives ◽  
Real Time Processing ◽  
Time Processing ◽  
Large Numbers ◽  
Hybrid Platform ◽  
Paper Format ◽  
Technical Solutions ◽  
Different Levels

With the advancement of technology we are heading towards a paperless environment. But there are still a large numbers of documents that exist in paper format in our daily lives. Thus the need to digitize these paper documents, archive them and view them at all times has arisen. The number of documents of a small organization may be in thousands, millions or even more. This chapter presents comparative analysis of different programming languages and libraries where it is intended to parallel process a huge stream of images which undergo unpredictable arrival of the images and variation in time. Since the parallelism can be implemented at different levels, different algorithms and techniques have also been discussed. It also presents the state of the art and discussion of various existing technical solutions to implement the parallelization on a hybrid platform for the real time processing of the images contained in a stream. Experimental results obtained using Apache Hadoop in combination with OpenMP have also been discussed.

Comparative Analysis of Efficient Platforms

Biometrics ◽  
2017 ◽  
pp. 1221-1240
Author(s):  
Khawaja Tehseen Ahmed ◽  
Mazhar Ul-Haq ◽  
Arsalaan Ahmed Shaikh ◽  
Raihan ur Rasool
Keyword(s):  
Comparative Analysis ◽  
Programming Languages ◽  
Daily Lives ◽  
Real Time Processing ◽  
Time Processing ◽  
Large Numbers ◽  
Hybrid Platform ◽  
Paper Format ◽  
Technical Solutions ◽  
Different Levels

With the advancement of technology we are heading towards a paperless environment. But there are still a large numbers of documents that exist in paper format in our daily lives. Thus the need to digitize these paper documents, archive them and view them at all times has arisen. The number of documents of a small organization may be in thousands, millions or even more. This chapter presents comparative analysis of different programming languages and libraries where it is intended to parallel process a huge stream of images which undergo unpredictable arrival of the images and variation in time. Since the parallelism can be implemented at different levels, different algorithms and techniques have also been discussed. It also presents the state of the art and discussion of various existing technical solutions to implement the parallelization on a hybrid platform for the real time processing of the images contained in a stream. Experimental results obtained using Apache Hadoop in combination with OpenMP have also been discussed.

Modeling Rumors in Twitter

2016 ◽  
Vol 3 (4) ◽  
pp. 46-67 ◽  
Author(s):  
Rhythm Walia ◽  
M.P.S. Bhatia
Keyword(s):  
Social Networks ◽  
Social Media ◽  
Comparative Analysis ◽  
State Of The Art ◽  
Viral Marketing ◽  
Daily Lives ◽  
The Past ◽  
Depth Analysis ◽  
Analysis Of Results ◽  
Effective Channel

With the advent of web 2.0 and anonymous free Internet services available to almost everyone, social media has gained immense popularity in disseminating information. It has become an effective channel for advertising and viral marketing. People rely on social networks for news, communication and it has become an integral part of our daily lives. But due to the limited accountability of users, it is often misused for the spread of rumors. Such rumor diffusion hampers the credibility of social media and may spread social panic. Analyzing rumors in social media has gained immense attention from the researchers in the past decade. In this paper the authors provide a survey of work in rumor analysis, which will serve as a stepping-stone for new researchers. They organized the study of rumors into four categories and discussed state of the art papers in each with an in-depth analysis of results of different models used and a comparative analysis between approaches used by different authors.

scholarly journals New fast “One-pot” Technique for the Production of Glycyrrhetinic Acid from the Roots of licorice (Glycyrrhiza glabra)

2018 ◽  
Vol 13 (7) ◽  
pp. 1934578X1801300
Author(s):  
Anna V. Lekar ◽  
Sergey N. Borisenko ◽  
Elena V. Vetrova ◽  
Elena V. Maksimenko ◽  
Salima S. Khizrieva ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Subcritical Water ◽  
Low Cost ◽  
Glycyrrhetinic Acid ◽  
Glycyrrhiza Glabra ◽  
One Pot ◽  
Glycyrrhiza Glabra L ◽  
The One ◽  
Toxic Organic Solvents ◽  
Pot Technique

The aim of this work was to develop and study a fast “one-pot” procedure for the production of glycyrrhetinic acid (GLA) from the roots of licorice ( Glycyrrhiza glabra L.) using subcritical water (SBW). Technique requires no use expensive and toxic organic solvents. For the first time the new method was used for the production of glycyrrhetinic acid (aglycone of glycyrrhizic acid) by “one-pot” technique. HPLC was used to determine the quantitative compositions of the obtained products. It has been shown that variation of only one parameter of the process (temperature) allows alteration of composition of the products obtained by new “one-pot” technique. The “one-pot” procedure developed for the production of GLA in SBW is faster (12 folds) than conventional methods that use expensive and toxic organic solvents. The proposed procedure has the excellent potential for the future development of the fast and low cost technologies for the production of GLA and its derivatives in the pharmaceutical, food and cosmetic industries.

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