scholarly journals Synthesis and characterization of a novel carboxyl group containing (co)polyimide with sulfur in the polymer backbone

2012 ◽  
Vol 8 ◽  
pp. 776-786 ◽  
Author(s):  
Miroslav Mrsevic ◽  
David Düsselberg ◽  
Claudia Staudt
Keyword(s):  
Organic Solvents ◽  
High Performance ◽  
Moisture Uptake ◽  
Separation Processes ◽  
Coating Materials ◽  
Polymer Backbone ◽  
Wide Range ◽  
Optical Applications ◽  
Transparent Polymers ◽  
High Performance Coating

Soluble functional (co)polyimides are of great interest in the area of separation processes or optical applications, due to their excellent mechanical-, thermal- and optical properties, their superior processability and the ability to adapt their properties to a wide range of special applications. Therefore, two series of novel (co)polyimides containing fluorinated sulfur- and carboxylic acid groups consisting of 4,4′-(hexafluoroisopropylidene)di(phthalic anhydride) (6FDA), 3,5-diaminobenzoic acid (DABA), 4,4′-diaminodiphenylsulfide (4,4′-SDA) and 3,3′-diaminodiphenylsulfone (3,3′-DDS) were synthesized in a two-step polycondensation reaction. The synthesized copolymers were characterized by using NMR, FTIR, GPC, and DSC. Furthermore, with regard to processing and potential applications, the thermal stability, solubility in common organic solvents, moisture uptake, and transparency were investigated. Compared to commercially available transparent polymers, i.e., polymethylmethacrylate and cycloolefin polymers, the sulfur (co)polyimides containing carboxyl groups showed much higher glass-transition temperatures, comparably low moisture uptake and high transmission at the sodium D-line. Furthermore, good solubility in commonly used organic solvents makes them very attractive as high-performance coating materials.

Cubic silsesquioxanes as tunable high-performance coating materials

2013 ◽  
Vol 27 (11) ◽  
pp. 652-659 ◽  
Author(s):  
Hyun Wook Ro ◽  
Vera Popova ◽  
Dave J. Krug ◽  
Aaron M. Forster ◽  
Richard M. Laine ◽  
...  
Keyword(s):  
High Performance ◽  
Coating Materials ◽  
High Performance Coating

ChemInform Abstract: Cubic Silsesquioxanes as Tunable High-Performance Coating Materials.

ChemInform ◽  
2014 ◽  
Vol 45 (3) ◽  
pp. no-no
Author(s):  
Hyun Wook Ro ◽  
Vera Popova ◽  
Dave J. Krug ◽  
Aaron M. Forster ◽  
Richard M. Laine ◽  
...  
Keyword(s):  
High Performance ◽  
Coating Materials ◽  
High Performance Coating

scholarly journals Micro/Nano Technologies for High-Density Retinal Implant

Micromachines ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 419 ◽  
Author(s):  
Qi Zeng ◽  
Saisai Zhao ◽  
Hangao Yang ◽  
Yi Zhang ◽  
Tianzhun Wu
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
High Density ◽  
Future Research ◽  
Electronic Systems ◽  
Retinal Neuron ◽  
Retinal Implant ◽  
Coating Materials ◽  
Retinal Stimulation ◽  
High Performance Coating

During the past decades, there have been leaps in the development of micro/nano retinal implant technologies, which is one of the emerging applications in neural interfaces to restore vision. However, higher feedthroughs within a limited space are needed for more complex electronic systems and precise neural modulations. Active implantable medical electronics are required to have good electrical and mechanical properties, such as being small, light, and biocompatible, and with low power consumption and minimal immunological reactions during long-term implantation. For this purpose, high-density implantable packaging and flexible microelectrode arrays (fMEAs) as well as high-performance coating materials for retinal stimulation are crucial to achieve high resolution. In this review, we mainly focus on the considerations of the high-feedthrough encapsulation of implantable biomedical components to prolong working life, and fMEAs for different implant sites to deliver electrical stimulation to targeted retinal neuron cells. In addition, the functional electrode materials to achieve superior stimulation efficiency are also reviewed. The existing challenge and future research directions of micro/nano technologies for retinal implant are briefly discussed at the end of the review.

Designing novel multilayered nanocomposites for high-performance coating materials with online strain monitoring capability

2017 ◽  
Vol 233 (4) ◽  
pp. 664-675 ◽  
Author(s):  
Hashina P Anwar Ali ◽  
Ihor Radchenko ◽  
Jiahui Zhou ◽  
Liu Qing ◽  
Arief Budiman
Keyword(s):  
High Performance ◽  
Linear Trend ◽  
True Strain ◽  
Ex Situ ◽  
Large Strains ◽  
Coating Materials ◽  
Elastic Regime ◽  
Strain Monitoring ◽  
High Performance Coating ◽  
Very High

Multilayered nanocomposites, known for its mechanical properties of very high flow strength, ultra-light weight and stable plastic flow to large strains, represent a class of novel composite nanomaterials in which there arises rare opportunities to design new materials from the ground up and to tailor their properties to suit exactly their performance requirements. These materials can withstand very high strains in the elastic regime without any inelastic relaxation due to plasticity or fracture compared to its bulk counterparts. This extended elastic regime opens up new possibilities for tuning the physical and chemical properties of materials as well as bringing novel functionalities, such as high performance coating materials with online strain monitoring capability. Our resistivity measurements during ex situ uniaxial micropillar compression in this article suggests basic feasibility of a Cu–Nb multilayered nanocomposite with 20 nm layer thickness having a novel functionality for online strain monitoring capability, in addition to its more known application as a high performance coating materials due to its extraordinary strength and deformability. A linear trend of resistivity with respect to true strain for strains in excess of 3.5% was observed and suggests a significant regime for use for strain sensor/detection/monitoring capability.

Design and Synthesis of a High Performance Coating

2019 ◽  
Author(s):  
Swarn Jha ◽  
Yan Chen ◽  
Rick Wang ◽  
Mohamed Gharib ◽  
Hong Liang
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Structural Integrity ◽  
Low Cost ◽  
Surface Characteristics ◽  
Design And Synthesis ◽  
Main Challenge ◽  
Lubrication Performance ◽  
Wide Range ◽  
High Performance Coating

Abstract High performance coatings are needed for downhole drilling applications. The main challenge in developing such coatings is to impart desirable surface characteristics such as low friction, high wear and corrosion resistance, while retaining structural integrity and consistency. Most coatings do not sustain the conditions in harsh environments resulting in failure and safety hazards. In this research, we designed high temperature coatings with integration of components that display wear resistance. After synthesis, they exhibited promising lubrication performance. Specifically, a simple and low-cost method was developed that can process the coating consisting high-temperature ceramics such as BN, SiC. Hybridizing graphite and α-zirconium phosphate as friction modifiers ideal for use with metals, alloys and ceramics, this coating is durable in a wide range of temperatures. Experimental results showed that the friction coefficient obtained for our coating was 0.17 as against the 0.50 value obtained for steel on steel sliding contact. In this work, we detail about the composition, microstructure, and tribological evaluation of the coatings tailored for drilling applications.

Cycloaliphatic Epoxide Based Sol-Gel Derived Materials

1994 ◽  
Vol 346 ◽  
Author(s):  
G. A. Sigel ◽  
R.C. Domszy ◽  
W. C. Welch
Keyword(s):  
High Performance ◽  
Sol Gel ◽  
Mechanical Analysis ◽  
Processing Conditions ◽  
Coating Materials ◽  
Uv Curable ◽  
Organic Hybrid ◽  
High Performance Coating ◽  
Gel Composition

ABSTRACTScratch resistant transparent organically modified sol-gel materials typically utilize organics as acrylates, or pre-polymer silicon or carbon backbone material. The use of diepoxide monomers within a sol-gel matrix has yet to be described as a means of obtaining high performance coating materials. This paper describes the preparation and characterization of UV curable inorganic-organic hybrid glass materials based on the incorporation of cycloaliphatic diepoxide monomers into a sol-gel composition of TEOS and the epoxide silane coupling agent glycidoxypropyl-trimethoxysilane. We report aging and humidity studies along with processing conditions that affect the silicate distribution and cationic cure of the diepoxide resin based on solution and solid state NMR experiments. Mechanical analysis of thin films prepared by varying processing conditions and length of the diepoxide backbone are also discussed.

High-Throughput Adhesion Evaluation and Scale-up of Combinatorial Leads of Organic Protective Coatings

2003 ◽  
Vol 804 ◽  
Author(s):  
Karin Ezbiansky ◽  
George Medford ◽  
Hariklia Reitz ◽  
Radislav A. Potyrailo ◽  
Bret J. Chisholm ◽  
...  
Keyword(s):  
High Throughput ◽  
High Performance ◽  
Protective Coatings ◽  
Scale Up ◽  
Performance Testing ◽  
Plastic Substrate ◽  
Automotive Applications ◽  
Coating Materials ◽  
End Use ◽  
High Performance Coating

ABSTRACTCoupling of combinatorial chemistry methods with high-throughput (HT) performance testing and measurements of resulting properties has provided a powerful set of tools for the 10-fold accelerated discovery of new high-performance coating materials for automotive applications. This approach replaces labor-intensive steps with automated systems for evaluation of adhesion of 8 × 6 arrays of coating elements that are discretely deposited on a single 9 × 12 cm plastic substrate. Performance of coatings is evaluated with respect to their resistance to adhesion loss. This parameter is one primary consideration in end-use automotive applications. Coating leads identified from the HT screening have been validated on the traditional scale. Details of these validation studies are discussed.

scholarly journals Overview of Silica-Polymer Nanostructures for Waterborne High-Performance Coatings

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1003
Author(s):  
Tiago D. Martins ◽  
Tânia Ribeiro ◽  
José Paulo S. Farinha
Keyword(s):  
High Performance ◽  
Hybrid Nanostructures ◽  
Inorganic Filler ◽  
Functional Coatings ◽  
Hybrid Films ◽  
Coating Materials ◽  
Polymer Nanostructures ◽  
Performance Functional ◽  
High Performance Coating ◽  
Inorganic Components

Combining organic and inorganic components at a nanoscale is an effective way to obtain high performance coating materials with excellent chemical and physical properties. This review focuses on recent approaches to prepare hybrid nanostructured waterborne coating materials combining the mechanical properties and versatility of silica as the inorganic filler, with the flexural properties and ease of processing of the polymer matrix. We cover silica-polymer coupling agents used to link the organic and inorganic components, the formation of hybrid films from these silica-polymer nanostructures, and their different applications. These hybrid nanostructures can be used to prepare high performance functional coatings with different properties from optical transparency, to resistance to temperature, hydrophobicity, anti-corrosion, resistance to scratch, and antimicrobial activity.

Validated Stability Indicating HPTLC Method for the Estimation of Amoxapine in Different Stress Conditions

2019 ◽  
Vol 15 (3) ◽  
pp. 273-279
Author(s):  
Shweta G. Rangari ◽  
Nishikant A. Raut ◽  
Pradip W. Dhore
Keyword(s):  
High Performance ◽  
Limit Of Detection ◽  
Degradation Products ◽  
Analysis Data ◽  
Peak Height ◽  
Good Resolution ◽  
Stability Indicating ◽  
Limit Of Quantitation ◽  
Wide Range ◽  
Hptlc Method

Background:The unstable and/or toxic degradation products may form due to degradation of drug which results into loss of therapeutic activity and lead to life threatening condition. Hence, it is important to establish the stability characteristics of drug in various conditions such as in temperature, light, oxidising agent and susceptibility across a wide range of pH values.Introduction:The aim of the proposed study was to develop simple, sensitive and economic stability indicating high performance thin layer chromatography (HPTLC) method for the quantification of Amoxapine in the presence of degradation products.Methods:Amoxapine and its degraded products were separated on precoated silica gel 60F254 TLC plates by using mobile phase comprising of methanol: toluene: ammonium acetate (6:3:1, v/v/v). The densitometric evaluation was carried out at 320 nm in reflectance/absorbance mode. The degradation products obtained as per ICH guidelines under acidic, basic and oxidative conditions have different Rf values 0.12, 0.26 and 0.6 indicating good resolution from each other and pure drug with Rf: 0.47. Amoxapine was found to be stable under neutral, thermal and photo conditions.Results:The method was validated as per ICH Q2 (R1) guidelines in terms of accuracy, precision, ruggedness, robustness and linearity. A good linear relationship between concentration and response (peak area and peak height) over the range of 80 ng/spot to 720 ng/spot was observed from regression analysis data showing correlation coefficient 0.991 and 0.994 for area and height, respectively. The limit of detection (LOD) and limit of quantitation (LOQ) for area were found to be 1.176 ng/mL and 3.565 ng/mL, whereas for height, 50.063 ng/mL and 151.707 ng/mL respectively.Conclusion:The statistical analysis confirmed the accuracy, precision and selectivity of the proposed method which can be effectively used for the analysis of amoxapine in the presence of degradation products.

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