Development of New Polymer Systems and Quantum Dots - Polymer Nanocomposites for Low-cost, Flexible OLED Display Applications

2011 ◽  
Vol 1359 ◽  
Author(s):  
Lihua Zhao ◽  
Zhang-Lin Zhou ◽  
Zengshan Guo ◽  
Jian Pei ◽  
Samuel Mao
Keyword(s):  
Quantum Dots ◽  
Polymer Nanocomposites ◽  
Photophysical Properties ◽  
Polymer Network ◽  
Polymer Networks ◽  
Life Time ◽  
Hole Transport ◽  
Interpenetrating Polymer Networks ◽  
Solution Processing ◽  
Polymer Systems

ABSTRACTRecently, tremendous progress has been made toward application of organic (small molecule/polymer) light-emitting diodes (OLEDs) in full color flat panel displays and other devices. However, with current technologies, OLEDs are still struggling with high manufacturing costs which really limit the size of OLEDs panels and with life time, especially differential aging of colors. To be more cost-effective for fabricating OLEDs, we believe solution-processing would be an attractive path due to its simplicity and highly reduced equipment costs. This proceeding paper discusses our recent progress in development of new polymer systems that are highly solvent-resistant but maintaining their photophysical properties and hybrid quantum-dots (QDs)-polymer nanocomposites for their use in multicolor and multilayer OLEDs pixels through solution-processing. Our new polymer systems are named conductive semi-interpenetrating polymer networks (C-Semi-IPNs) served in different layers of OLEDs devices, containing an inert polymer network and conducting polymer(s) including hole transport and emissive materials. Since these do not require complicated chemical modification or introduction of reactive moieties to OLED materials, many state-of-the-arts emissive polymers can be utilized to achieve RGB and white OLEDs. The research findings on hybrid QDoligomer nanocomposite as a good analogue lead to the successful design and synthesis of QDpolymer nanocomposites which were used to build proof-of-the-concept devices showing a good promise in providing excellent color purity and stability as well as device robustness.

Development of semi-interpenetrating polymer networks and quantum dots–polymer nanocomposites for low-cost, flexible OLED display application

2012 ◽  
Vol 27 (4) ◽  
pp. 639-652 ◽  
Author(s):  
Lihua Zhao ◽  
Zhang-Lin Zhou ◽  
Zengshan Guo ◽  
Gary Gibson ◽  
James A. Brug ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Polymer Nanocomposites ◽  
Low Cost ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Image Position ◽  
Oled Display

Abstract

Emissive Semi-Interpenetrating Polymer Networks for Ink-Jet Printed Multilayer OLEDs

2021 ◽  
Author(s):  
Susanna V. Kunz ◽  
Cameron M. Cole ◽  
Thomas Baumann ◽  
Prashant Murlidhar Sonar ◽  
Soniya Yambem ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Organic Light Emitting Diodes ◽  
Cross Linking ◽  
Solution Processing ◽  
Light Emitting ◽  
Polymer Precursors ◽  
Organic Light ◽  
Ink Jet

Solution-processing of multilayered Organic Light Emitting Diodes (OLEDs) remains a challenge that is often addressed by cross-linking polymer precursors into insoluble networks. Herein, we blend an emissive polymer carrying a...

Eosin Y functionalized tertiary amine-bearing interpenetrating polymer networks for heterogeneous catalysis of logic-controlled oxygen-tolerant radical polymerization

2020 ◽  
Vol 8 (47) ◽  
pp. 25363-25370
Author(s):  
Xue Li ◽  
Yu Chi Zhang ◽  
Sunjie Ye ◽  
Xi Rong Zhang ◽  
Tao Cai
Keyword(s):  
Heterogeneous Catalysis ◽  
Radical Polymerization ◽  
Tertiary Amine ◽  
Heterogeneous Catalysts ◽  
Polymer Network ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Eosin Y

Given the scalability and vast applicability of the heterogeneous catalysts and the burgeoning interests in biorelated applications, the interpenetrating polymer network catalysts will facilitate the realization of green, precise and efficient polymerization.

Semi-interpenetrating Polymer Networks Containing Polysaccharides. I Xanthan/Lignin Networks

2007 ◽  
Vol 19 (5-6) ◽  
pp. 603-620 ◽  
Author(s):  
Irina Elena Raschip ◽  
Cornelia Vasile ◽  
Diana Ciolacu ◽  
Georgeta Cazacu
Keyword(s):  
Xanthan Gum ◽  
Polymer Network ◽  
Polymer Networks ◽  
Temperature Stability ◽  
Interpenetrating Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Helical Conformation ◽  
Swelling Properties ◽  
Food Ingredients ◽  
Swelling Rate

The polysaccharides are important materials in food, pharmaceutical, cosmetic and related biomedical applications. Xanthan gum is a microbial polysaccharide of great commercial significance. It is well known as one of the best thickening polymers due to its high intrinsic stiffness related to the helical conformation stabilized in the presence of excess salt. It is used in a wide variety of foods for a number of important reasons, including emulsion stabilization, temperature stability, compatibility with food ingredients, and its pseudoplastic rheological properties. Due to its properties in thickening aqueous solutions, as a dispersing agent, and stabilizer of emulsions and suspensions, xanthan gum is used in pharmaceutical formulations, cosmetics, and agricultural products, as well as in textile printing pastes, ceramic glazes, slurry explosive formulations, and rust removers. In this work the crosslinking of a mixture of xanthan and lignins in the presence of the epichlorohydrin, leading to superabsorbant hydrogels with high swelling rate in aqueous mediums, was studied. The swelling properties of these composite hydrogels were investigated. Three different types of lignin have been used namely: aspen wood lignin (L), annual fiber crop lignin (GL) and lignin epoxy-modified resin (LER). Semi-interpenetrating polymer network hydrogels in various ratios were prepared. The influence of gravimetric ratio between components of the semi-interpenetrating polymer networks, as well as the kinetics of water sorption will be discussed. The maximum swelling degree of the hydrogels and the swelling rate constant were determined as a function of the hydrogel's composition. It has been established that the nature of lignin significantly influences swelling process, the chemical modified lignin having a particular behavior.

scholarly journals Multiply Interpenetrating Polymer Networks: Preparation, Mechanical Properties, and Applications

Gels ◽  
2019 ◽  
Vol 5 (3) ◽  
pp. 36 ◽  
Author(s):  
Panayiota A. Panteli ◽  
Costas S. Patrickios
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Polymer Network ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Low Friction ◽  
Friction Coefficients ◽  
Polymeric Component ◽  
Work Done

This review summarizes work done on triply, or higher, interpenetrating polymer network materials prepared in order to widen the properties of double polymer network hydrogels (DN), doubly interpenetrating polymer networks with enhanced mechanical properties. The review will show that introduction of a third, or fourth, polymeric component in the DNs would further enhance the mechanical properties of the resulting materials, but may also introduce other useful functionalities, including electrical conductivity, low-friction coefficients, and (bio)degradability.

scholarly journals Multiscale Experimental Evaluation of Agarose-Based Semi-Interpenetrating Polymer Network Hydrogels as Materials with Tunable Rheological and Transport Performance

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2561
Author(s):  
Monika Trudicova ◽  
Jiri Smilek ◽  
Michal Kalina ◽  
Marcela Smilkova ◽  
Katerina Adamkova ◽  
...  
Keyword(s):  
Complex Modulus ◽  
Specific Binding ◽  
Polymer Network ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Analytical Methodology ◽  
Wide Range ◽  
Polymer Component ◽  
Poly Styrene Sulfonate

This study introduces an original concept in the development of hydrogel materials for controlled release of charged organic compounds based on semi-interpenetrating polymer networks composed by an inert gel-forming polymer component and interpenetrating linear polyelectrolyte with specific binding affinity towards the carried active compound. As it is experimentally illustrated on the prototype hydrogels prepared from agarose interpenetrated by poly(styrene sulfonate) (PSS) and alginate (ALG), respectively, the main benefit brought by this concept is represented by the ability to tune the mechanical and transport performance of the material independently via manipulating the relative content of the two structural components. A unique analytical methodology is proposed to provide complex insight into composition–structure–performance relationships in the hydrogel material combining methods of analysis on the macroscopic scale, but also in the specific microcosms of the gel network. Rheological analysis has confirmed that the complex modulus of the gels can be adjusted in a wide range by the gelling component (agarose) with negligible effect of the interpenetrating component (PSS or ALG). On the other hand, the content of PSS as low as 0.01 wt.% of the gel resulted in a more than 10-fold decrease of diffusivity of model-charged organic solute (Rhodamine 6G).

scholarly journals Bioremediation of Waste Water Containing Hazardous Cadmium Ion with Ion Imprinted Interpenetrating Polymer Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Girija Parameswaran ◽  
Beena Mathew
Keyword(s):  
Polymer Network ◽  
Polymer Networks ◽  
Environmental Water ◽  
Sorption Process ◽  
Interpenetrating Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Potassium Persulphate ◽  
Isotherm Equation ◽  
Ion Imprinted ◽  
Endothermic Process

A novel Cd(II) ion imprinted interpenetrating polymer network (Cd(II)IIP) was prepared by free radical polymerization using alginic acid and NNMBA-crosslinked polyacrylamide in presence of initiator potassium persulphate. Cd(II)IIP showed higher capacity and selectivity than the nonimprinted polymer (NIP). The sorption capacities of Cd(II)IIP and NIP for Cd(II) ions were 0.886 and 0.663 meqmole-1, respectively. Kinetics studies showed that the sorption process closely agreed with a pseudosecond-order model. The thermodynamic data suggest that the sorption is a spontaneous endothermic process. Equilibrium experiments showed very good fit with the Langmuir isotherm equation for the monolayer sorption process. Cd(II)IIP exhibited good reusability, and the sorption capacity of Cd(II)IIP was stable within the first 4 cycles without obvious decrease. Also Cd(II)IIP showed almost 100% removal efficiency for Cd(II) ions in real environmental water samples, indicating that Cd(II)IIP could have wide application prospects in Cd(II) ion removal.

A Research of the Spongy Foams from Interpenetrating Polymer Network of Polyurethane/ Epoxy Resin

2012 ◽  
Vol 621 ◽  
pp. 39-43
Author(s):  
Hong Jun Huang ◽  
Wang Kang ◽  
Guo Shun Wan ◽  
Jiang Lei
Keyword(s):  
Epoxy Resin ◽  
Polymer Network ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Initial Adhesion ◽  
Epoxy Content

A series of interpenetrating polymer networks (IPN) spongy foams based on polyurethane (PU) and epoxy resin (EP) were prepared by a simultaneous polymerization technique. The PU/EP IPN spongy foams with different epoxy content were investigated. The results showed that initial adhesion increased with the increment of EP content, and gained the highest value when the content reached to 20%; FTIR suggested the formation of PU/EP IPN; the density also increased with the increasing content of epoxy; the highest degree of uniformity in bubbles were observed in foams with 20% content of epoxy resin.

scholarly journals Semi-interpenetrating polymer networks based on polyacrylamide and poly[itaconic acid]

2003 ◽  
Vol 57 (11) ◽  
pp. 543-546 ◽  
Author(s):  
Melina Kalagasidis-Krusic ◽  
Biljana Nikolic ◽  
Jovanka Filipovic
Keyword(s):  
Itaconic Acid ◽  
Polymer Network ◽  
Polymer Networks ◽  
Low Ph ◽  
Interpenetrating Polymer Networks ◽  
Polyacrylamide Gel ◽  
Swelling Properties ◽  
Swelling Degree ◽  
Equilibrium Swelling ◽  
Carboxylic Groups

The effect of pH and temperature on the equilibrium swelling properties of PIA/PAAm semi-IPNs were investigated.Semi-IPNs based on polyacrylamide (PAAm) and poly(itaconic acid) (PIA) were prepared by two different techniques, by polymerizing itaconic acid in the presence of polyacrylamide gel (Semi-IPNs-l) and by making the polyacrylamide gel in the presence of previously synthesized poly(itaconic acid) (Semi-IPNs-ll), with different PIA/PAAm mass ratios. The equilibrium swelling degree of an ionic network depends very much on the concentration of ionisable groups. The addition of a small amount of itaconic acid dramatically changes the swelling behavior of PAAm. Increase of the ionic monomer (IA) produces swelling degrees that increase to a high extent when the pH of the buffer solution is higher than the nominal pKa values of the acid groups. Gels with higher IA content swell less than PAAm gels in low pH buffers. At low pH, when complexation due to hydrogen bonding occurs between the carboxylic groups and amide groups of acrylamide, the polymer network collapses and the swelling ratio is low. The presence of hydrogen bonds in the complexes causes additional constraints in the network, acting as a physical crosslinking and makes the network less hydrophilic, because the carboxylic groups on the PIA are occupied in the complexes. As opposed to this, the equilibrium swelling degrees change very little with pH of the solution in nonionic PAAm gel.Hydrogels exhibit continuous changes in water content as a function of temperature. The swelling degree increases with increasing temperature due to gel expansion upon warming.

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