scholarly journals OPTICAL AND PHOTOCHEMICAL PROPERTIES OF POLYMERS BASED ON 2-(4-METHACRYOXYSTYRYL)QUINOLINE

2020 ◽  
pp. 61-66
Author(s):  
O. Krupka ◽  
V. Smokal ◽  
O. Kharchenko ◽  
B. Derkowska-Zielinska
Keyword(s):  
Radical Polymerization ◽  
Uv Spectroscopy ◽  
Polymer Materials ◽  
High Concentration ◽  
Design And Synthesis ◽  
Advantages And Disadvantages ◽  
Photochemical Properties ◽  
Principles Of Design ◽  
Easy Integration ◽  
Dsc Method

The design and synthesis of new polymer materials with controlled and predictable properties is still a challenge. Photoactive chromophore can be incorporated into a polymer in several different ways: guest-host systems, main chain polymers and side chain polymers. While none of these options are not perfect and each has its advantages and disadvantages. However, the chromophore functionalized polymers were found to be more effective due to: high concentration of the chromophores can be introduced; polymers with chromophore moiety show increased stability of poling induced SHG activity and decrease of the orientation relaxation process; absence of phase separation lessens the scattering losses; such techniques as plasma etching, optically induced index changes, laser ablation, electrical poling can be applied; multilayer phormation assists in easy integration with electronic and optical components. The principles of design of various molecular photoswitches and logical devices, in particular, those based on the photoisomerization reaction of diarylethylenes have been actively investigated in recent years. Azasubstituted diarylethylenes (DAE) styrylquinolines containing a central double bond and an endocyclic nitrogen atom, have become the subject of interest due to their ability to reversible transformations (photoisomerization and protonation). In this work, photosensitive polymers were synthesized by radical polymerization of corresponding styrylquinoline derivatives with comonomers methyl methacrylate (MMA) using asobisisobutyronitrile (AIBN) as radical initiator. We present results obtained for thin films of the methacrylic polymers incorporating styrylquinoline side-group as optically active molecule. Synthesis of 2-(4-methacryloxystyryl)quinolone and 2-(4-methacryloxystyryl)-6-methoxyquinoline was described. The polymers were obtained by free radical polymerization of methacrylic monomers in dimethylformamide with azobisisobutyronitrile as initiator. The products of polymerization were characterized and evaluated by 1HNMR, UV spectroscopy. Glass transition temperatures were characterized by DSC method. It was found 133°C, 110°C, 130°C, 112°C for P1, P1MMA, P2, P2MMA respectively. Their optical and photochemical properties as well as temperature dependence of the photoluminescence of diarylethylenes have been investigated.

Hybrid polymer composite materials. Part 2. Preparation technology

2020 ◽  
pp. 8-13
Keyword(s):  
Composite Materials ◽  
Impact Toughness ◽  
Polymer Composites ◽  
The Other ◽  
Polymer Materials ◽  
Hybrid Polymer ◽  
Preparation Technology ◽  
Advantages And Disadvantages ◽  
Hybrid Polymer Composite ◽  
The One

The main methods (pressing and winding) of the processing of hybrid polymer composites to obtain items were examined. Advantages and disadvantages of the methods were noted. Good combinations of different-module fibers (carbon, glass, boron, organic) in hybrid polymer materials are described, which allow one to prepare materials with high compression strength on the one hand, and to increase fracture energy of samples and impact toughness on the other hand.

Possibilities of using biodegradable polymeric materials in the agricultural sector

2020 ◽  
Vol 67 (2) ◽  
pp. 115-120
Author(s):  
Raisa A. Alekhina ◽  
Victoriya E. Slavkina ◽  
Yuliya A. Lopatina
Keyword(s):  
Mechanical Properties ◽  
Biodegradable Polymers ◽  
Biodegradable Polymer ◽  
Agricultural Sector ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
Limiting Factors ◽  
Research Purpose ◽  
Biodegradable Materials ◽  
Advantages And Disadvantages

The article presents options for recycling polymers. The use of biodegradable materials is promising. This is a special class of polymers that can decompose under aerobic or anaerobic conditions under the action of microorganisms or enzymes forming natural products such as carbon dioxide, nitrogen, water, biomass, and inorganic salts. (Research purpose) The research purpose is in reviewing biodegradable materials that can be used for the manufacture of products used in agriculture. (Materials and methods) The study are based on open information sources containing information about biodegradable materials. Research methods are collecting, studying and comparative analysis of information. (Results and discussion) The article presents the advantages and disadvantages of biodegradable materials, mechanical properties of the main groups of biodegradable polymers. The article provides a summary list of agricultural products that can be made from biodegradable polymer materials. It was found that products from the general group are widely used in agriculture. Authors have found that products from a special group can only be made from biodegradable polymers with a controlled decomposition period in the soil, their use contributes to increasing the productivity of crops. (Conclusions) It was found that biodegradable polymer materials, along with environmental safety, have mechanical properties that allow them producing products that do not carry significant loads during operation. We have shown that the creation of responsible products (machine parts) from biodegradable polymers requires an increase in their strength properties, which is achievable by creating composites based on them. It was found that the technological complexity of their manufacture and high cost are the limiting factors for the widespread use of biodegradable polymers at this stage.

scholarly journals The Reducing Approaches of Scattering Losses in Polymer Planar Optical Waveguides

2021 ◽  
Vol 7 (1) ◽  
pp. 31-40
Author(s):  
T. Radzievskaya ◽  
N. Ivanov ◽  
S. Tarasov
Keyword(s):  
Data Transmission ◽  
Optical Waveguides ◽  
Soft Lithography ◽  
High Speed ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
Advantages And Disadvantages ◽  
High Speed Data ◽  
Scattering Losses ◽  
Planar Optical Waveguides

The article presents the development prospects of planar optical waveguides for high-speed data transmission systems optoelectronic buses by polymer materials. The advantages and disadvantages of using non-specialized polymeric materials for general use are revealed. The polymer planar optical waveguides fabrication technologies are proposed. The main losses types in planar optical waveguides, the reasons for their occurrence, as well as approaches to their reduction are determined. Using the example of PDMS polymer and soft lithography technology, the technological process critical stages of polymer planar optical waveguides production are noted, which contribute to an scattering losses increase. For each stage, algorithms are proposed to prevent an scattering losses increase. These algorithms were implemented in practice in the manufacture of layouts of polymer planar optical waveguides of the optical-electronic data transmission bus.

Recycling methods of thermoplastic material components of machines

2021 ◽  
Vol 0 (5) ◽  
pp. 33-36
Author(s):  
B. M. Archakov ◽  
Keyword(s):  
Polymer Materials ◽  
Thermoplastic Polymer ◽  
Chemical Methods ◽  
Thermoplastic Material ◽  
Advantages And Disadvantages

Analysis of different recycling methods of machine components made of thermoplastic polymer materials has been carried out. It was found out that the most prevalent methods were mechanical ones (granulation, agglomeration). Advantages and disadvantages of mechanical and chemical methods of processing the thermoplastics are discussed.

Design and synthesis of a fluorescent amino poly(glycidyl methacrylate) for efficient gene delivery

2019 ◽  
Vol 7 (11) ◽  
pp. 1875-1881 ◽  
Author(s):  
Hongtao Chen ◽  
Shusen You ◽  
Qing Cai ◽  
Yang Zheng ◽  
Liqun Zhang ◽  
...  
Keyword(s):  
Gene Delivery ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Glycidyl Methacrylate ◽  
Dna Delivery ◽  
Atom Transfer ◽  
Design And Synthesis ◽  
Efficient Gene ◽  
Low Cytotoxicity ◽  
Delivery Efficiency

A fluorescent amino poly(glycidyl methacrylate) (PGOHMA) was synthesized by atom transfer radical polymerization (ATRP) and post-polymerization. PGOHMA has low cytotoxicity and high DNA delivery efficiency.

Functional coatings formed on the titanium and magnesium alloys as implant materials by plasma electrolytic oxidation technology: fundamental principles and synthesis conditions

2016 ◽  
Vol 34 (1-2) ◽  
pp. 65-83 ◽  
Author(s):  
Sergey Vasilievich Gnedenkov ◽  
Yurii Petrovich Sharkeev ◽  
Sergey Leonidovich Sinebryukhov ◽  
Olga Alekseevna Khrisanfova ◽  
Elena Viktorovna Legostaeva ◽  
...  
Keyword(s):  
Surface Modification ◽  
Plasma Electrolytic Oxidation ◽  
Polymer Materials ◽  
Functional Coatings ◽  
Average Life Span ◽  
Advantages And Disadvantages ◽  
Metallic Implants ◽  
Electrolytic Oxidation ◽  
Oxidation Technology ◽  
Plasma Electrolytic

AbstractMetallic implants have been successfully used in medicine for the past 60–70 years. Historically, implants were designed only as mechanical devices, whereas the biological aspects of their application were beyond the researchers’ interest. The improvement of living conditions and the increase of the average life span have changed the situation. The clinical requirements for medical implants rise up substantially. Presently, it seems impossible to imagine the use of metallic implants in the human body without preliminary surface modification to modulate the interaction between the surrounding biological environment and the implant. The review highlights the most recent advances in the field of functional coatings formed on implants by the plasma electrolytic oxidation technology. Special attention is dedicated to the principles of surface modification of the commercially pure titanium, titanium nickelide, and Mg-Mn-Ce magnesium alloy. The advantages and disadvantages of the method and the characteristics of these materials are discussed from this point of view. Some aspects of this review are aimed at corrosion protection of implants with application of polymer materials.

Fast copper catalyzed living radical polymerization of acrylonitrile utilizing a high concentration of radical initiator

2012 ◽  
Vol 50 (10) ◽  
pp. 1933-1940 ◽  
Author(s):  
Xiao-hui Liu ◽  
Jin Wang ◽  
Jian-shi Yang ◽  
Shu-lin An ◽  
Yuan-lin Ren ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Living Radical Polymerization ◽  
High Concentration ◽  
Radical Initiator
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