Contact active antibacterial phosphonium coatings cured with UV light

2015 ◽  
Vol 3 (8) ◽  
pp. 1474-1478 ◽  
Author(s):  
Tyler J. Cuthbert ◽  
Ryan Guterman ◽  
Paul J. Ragogna ◽  
Elizabeth R. Gillies
Keyword(s):  
High Stability ◽  
Uv Light ◽  
Uv Curing ◽  
Simple Approach

Antibacterial phosphonium coatings were prepared by UV curing of phosphonium monomers. The simple approach and high stability of phosphoniums relative to ammoniums makes these coatings promising alternatives to ammonium surfaces.

scholarly journals Light-Responsive Polymeric Micellar Nanoparticles with Enhanced Formulation Stability

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 377
Author(s):  
Kyoung Nan Kim ◽  
Keun Sang Oh ◽  
Jiwook Shim ◽  
Isabel R. Schlaepfer ◽  
Sana D. Karam ◽  
...  
Keyword(s):  
High Stability ◽  
Polymeric Micelles ◽  
Uv Light ◽  
Cancer Drug ◽  
Stacking Interactions ◽  
Anti Cancer ◽  
Target Sites ◽  
Formulation Stability ◽  
Micellar Core ◽  
Micellar Nanoparticles

Light-sensitive polymeric micelles have recently emerged as promising drug delivery systems for spatiotemporally controlled release of payload at target sites. Here, we developed diazonaphthoquinone (DNQ)-conjugated micellar nanoparticles that showed a change in polarity of the micellar core from hydrophobic to hydrophilic under UV light, releasing the encapsulated anti-cancer drug, doxetaxel (DTX). The micelles exhibited a low critical micelle concentration and high stability in the presence of bovine serum albumin (BSA) solution due to the hydrophobic and π–π stacking interactions in the micellar core. Cell studies showed enhanced cytotoxicity of DTX-loaded micellar nanoparticles upon irradiation. The enhanced stability would increase the circulation time of the micellar nanoparticles in blood, and enhance the therapeutic effectiveness for cancer therapy.

UV-Curable organic-inorganic hybrid films based on tetraethylorthosilicate oligomer and special acrylated polyester

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Jianyun He ◽  
Jinping Xiong ◽  
Bingqian Xia
Keyword(s):  
Uv Light ◽  
Uv Curing ◽  
Organic Matrix ◽  
Dynamic Mechanical Properties ◽  
Hybrid Films ◽  
Uv Curable ◽  
Inorganic Hybrid ◽  
Dynamic Mechanical ◽  
H Nmr ◽  
Uv Curing Process

AbstractOrganic-inorganic hybrid films were prepared using tetraethylorthosilicate (TEOS) oligomer and special acrylated polyester (SAP) via a UV-curing process. TEOS oligomers were prepared in the presence of water and ethanol using hydrochloric acid as the catalyst and characterized using 1H NMR, 29Si NMR and MALDI-TOF mass spectra. Special acrylated polyester was synthesized by 1,4-cyclohexane dimethanol, neopentyl glycol, 1,4-butanediol, maleic anhydride, adipic acid, and acrylic acid. Hybrid films were cured by UV light and the thermal properties, dynamic mechanical properties, and tensile properties of the hybrid films were evaluated as the function of TEOS oligomer content. The morphology of the hybrid films was examined using atomic force microscopy (AFM). The microscopy and dynamic mechanical data indicated that the hybrid films were heterogeneous materials with various inorganic particle sizes dispersed within the organic matrix. The results indicated that after incorporating the TEOS oligomer, the strength and thermal stability of the hybrid films were enhanced.

Application of Novel Base Amplifiers with 3-Nitropentan-2-yl Group to Photoreactive Materials

2006 ◽  
Vol 961 ◽  
Author(s):  
Koji Arimitsu ◽  
Yusuke Ito ◽  
Takahiro Gunji ◽  
Yoshimoto Abe ◽  
Kunihiro Ichimura
Keyword(s):  
Elevated Temperature ◽  
Uv Light ◽  
Uv Curing ◽  
Catalytic Amount ◽  
Exposure Dose ◽  
Light Irradiation ◽  
Side Chains ◽  
Aromatic Rings ◽  
Amino Groups ◽  
Acidic Aqueous Solution

ABSTRACTIn order to enhance the photosensitivity of photoreactive materials utilizing base-catalyzed reactions, we developed base amplifiers that decompose autocatalytically to generate newborn amine molecules. Actually, we reported that the addition of base amplifiers to the photoreactive materials such as photoresists and UV-curing materials resulted in the marked improvement photosensitivity. However, conventional base amplifiers have aromatic rings such as fluorenyl groups and phenyl groups. Consequently, these base amplifiers have strong absorption of UV light which is a trigger of photolysis of a photobase generator. This leads to the hindrance of the photolysis. We report here novel base amplifiers with 3-nitropentan-2-yl group which has no aromatic rings.The base amplifiers decomposed autocatalytically to generate newborn amine molecules at an elevated temperature in solution and a polystyrene film in the presence of a catalytic amount of amines. Moreover, combining the base amplifiers with UV-curing materials consisting of a photobase generator and liquid epoxy resins resulted in the improvement of curing efficiency. To apply the base amplifier to photopatterning materials, we synthesized novel silicone resins with 3-nitropentan-2-yl groups as base-amplifying polymers. A film of the resin decomposed autocatalytically to generate amino groups in its side chains at an elevated temperature in the presence of a catalytic amount of amines. Furthermore, we demonstrated that the resins sensitized with a photobase generator provided negative- and positive-working photopolymers in the following ways. A thin film of the resin containing 10 wt% of a photobase generator became soluble in an acidic aqueous solution after 254 nm light irradiation of an exposure dose of 1 mJ/cm2 and subsequent baking at 50 oC for 20 min. This is because of formation of amino groups in its side chains. On the other hand, the film became insoluble in organic solvents after 254 nm light irradiation of an exposure dose of 1 mJ/cm2 and subsequent heat treatment at 50 oC for 40 min, this arises from that the photobase-catalyzed hydrolytic condensation of residual ethoxysilyl units of the resin proceeded to form crosslinked networks.

UV Laser Bonding of Optical Devices on Polymers

2008 ◽  
Vol 580-582 ◽  
pp. 459-462 ◽  
Author(s):  
Joo Han Kim ◽  
Hyang Tae Kim ◽  
Chul Ku Lee
Keyword(s):  
Optical Fibers ◽  
Uv Light ◽  
Uv Curing ◽  
Spot Size ◽  
High Viscosity ◽  
Optical Devices ◽  
Optical Systems ◽  
Bonding Layer ◽  
Low Viscosity ◽  
Laser Bonding

UV curing adhesives have been introduced for bonding various materials at a room temperature. It has the advantage of putting minimum thermal load on the system; however, it is not suitable for precision bonding of micro systems such as micro optical devices because of its high viscosity and poor control of the UV light source. In the present work, a laser-curing bonding process of micro optical devices with a low-viscosity UV polymer adhesive has been developed. A focused Nd:YVO4 laser beam with a spot size of 30 µm with a laser power of 100 ~ 700 mW is used for curing a UV adhesive locally. A thin bonding layer with a thickness of a few hundred nanometers without any thermal effects can be obtained for precision laser bonding for optical fibers. Experimental results are provided and the process characteristics have been discussed. Moreover, potential applications in the field of micro optical systems are introduced as well.

Study on Shrinkage of Cured Volume for UV-Curing Coatings

2015 ◽  
Vol 731 ◽  
pp. 588-592 ◽  
Author(s):  
Qing Kai Wang ◽  
Bei Qing Huang ◽  
Xian Fu Wei ◽  
Hao Chen Shen
Keyword(s):  
Free Radical ◽  
Uv Light ◽  
Uv Curing ◽  
Volume Shrinkage ◽  
Curing Temperature ◽  
Shrinkage Rate ◽  
Uv Curable ◽  
Cationic Resin ◽  
Polyester Acrylate ◽  
Radical Type

UV-Curable Coatings, Have been Widely Used in Machinery, Chemical Engineering, Biology, Medicine, Electronics and so on, due to their Fast Curing, Low Curing Temperature, Low VOC Emissions and Low Energy Cost. however, the Volume Shrinkage during the Curing Process Have a Great Influence on the Performance of the Coating, which Ofen Lowering Coating Adhesive Strength and Accelerating the Aging Process of Coatings Film.The Paper Select Different Kinds of Monomers (EOEOEA, HDDA, TPGDA, NPGDA, TMPTA and EO3- TMPTA) and Light Cured Resin (free Radical Type: Polyester Acrylate Resin 5600, Polyurethane Acrylate UA VP 2396, the Pure Acrylic 6536-1,cationic Resin: Epoxy Cationic Resin Omnilance OC3005) to Prepare the UV Curing Coatings. Study on the Influence of Amount of Monomer and Polymer on Polyreaction Reaction by Using Orthogonal Experimental Design Method in Order to Choose the Monomer and Polymer that has the Least Volume Shrinkage Rate, then Develop Photocureable Coating Based on Free Radical Type and Cationic Resin above. the Results Indicate that the UV-Light Photocureable Coating Prepared by Single Functionality Monomer EOEOEA and the DPGDA that Doesn’t Have Neat Molecular Structure has the Less Volume Shrinkage Rate; however, in the Aspect of Prepolymer, the Preparation of UV-Light Photocureable Coating Based on Polyester Acrylate 5600 has the Least Volume Shrinkage Rate. Rely on the Experiment Results above, Prepare the New Kind of UV-Light Photocureable Coating that has Little Volume Shrinkage Rate.

scholarly journals Segmented Phase of Ultraviolet (UV) Curable Thermoset Polyurethanes-Graphite (TPU-G) Composites

2019 ◽  
Vol 8 (9S3) ◽  
pp. 1490-1495
Keyword(s):  
Hydrogen Bonding ◽  
Hard Segment ◽  
Uv Light ◽  
Soft Segment ◽  
Slip Casting ◽  
Uv Curing ◽  
Polymeric Materials ◽  
Functional Characteristic ◽  
Uv Curable ◽  
Graphite Particles

Segmented thermoset polymeric materials properties mainly classified through its carbonyl hydrogen bonding. The addition of graphite particle loading in polymeric materials tailored the functional characteristic of the composites. Therefore, the carbonyl hydrogen bonding in the hard segments of the synthesized segmented ultraviolet (UV) curable thermoset polyurethanes-graphite (TPU-G) composites was identified. This composites based green polymer incorporated with varying graphite particles loading were prepared through slip casting method which cure upon UV light. These result in an enhancement of the carbonyl hydrogen bonding which tribute to degree of phase separation (DPS %) in the TPU-G composites ranged from 10-20%, as compared to that in the pure TPU. In addition, the spectroscopy detects the formation of carbonyl hydrogen groups within the TPU-G composites although they are prone to chain scission and undergo photo oxidation subjected to ultraviolet (UV) curing. Upon UV curing, higher graphite weight loading (TPU-G20, TPU-G25 and TPU-G30 composites), shows higher and stable DPS% value, attribute to soft segment- soft segment and hard segment- hard segment establishment. Therefore, the graphite particles dominantly absorb the incident radiation instead of thermoset polyurethane without changing its based.

UV light-switchable transparent polymer films and invisible luminescent inks based on carbon dots and lanthanide complexes

2016 ◽  
Vol 4 (30) ◽  
pp. 7253-7259 ◽  
Author(s):  
Yu Wang ◽  
Klára Čépe ◽  
Radek Zbořil
Keyword(s):  
Polymer Films ◽  
Carbon Dots ◽  
Lanthanide Complexes ◽  
Uv Light ◽  
Simple Approach ◽  
Composite Polymer ◽  
Transparent Composite

We present a simple approach for the preparation of UV light-switchable transparent composite polymer films and invisible luminescent inks based on the combination of carbon dots (CDs) and trisdipicolinate lanthanide complexes.

Influence of photoinitiator and curing conditions on polymerization kinetics and gloss of UV-cured coatings

2007 ◽  
Vol 61 (5) ◽  
Author(s):  
V. Jančovičová ◽  
J. Kindernay ◽  
Z. Jakubíková ◽  
I. Mrlláková
Keyword(s):  
Light Intensity ◽  
Coating Thickness ◽  
Uv Light ◽  
Uv Curing ◽  
Polymerization Kinetics ◽  
Curing Conditions ◽  
Factors Affecting ◽  
Significant Factors

AbstractPolymerization kinetics and gloss of different formulations of coatings at different UV curing conditions were studied. The results showed that the photoinitiator type, its concentration, sample coating thickness, as well as the UV light intensity were the most significant factors affecting the polymerization course and the gloss of UV-cured films. The increasing concentration of the photoinitiator and the UV light intensity significantly decreased the gloss of the cured surface. The influence of the sample coating thickness on the kinetics and final gloss was also considerable.

Study on a Characterization Method of Curing Rate of UV Curing System Based on Rheokinetics

2012 ◽  
Vol 262 ◽  
pp. 454-459
Author(s):  
Bei Qing Huang ◽  
Kai Yuan Luo ◽  
Xian Fu Wei ◽  
Ling Ya Gu ◽  
Mu Qun Yu
Keyword(s):  
Dynamic Modulus ◽  
Uv Light ◽  
Uv Curing ◽  
Polymerization Reaction ◽  
Curing Process ◽  
Performance Parameters ◽  
Cure Reaction ◽  
New Approach ◽  
Set Up ◽  
Nonlinear Kinetic

Curing rate is one of the most important performance parameters of UV curing system. During the curing process, curing degree is closely related to curing rate. Cross linking and curing degree of the system could be reflected by rheological characteristics. A method based on rheokinetics was used to characterize radical polymerization reaction which initiated by UV light. Changes of G’ (dynamic modulus) in every stage of curing process were real-time monitored by a rheometer equipped with UV curing accessory. The influence of varieties and contents of photo-initiators on curing process of polyester acrylates was studied. Associating conversion rate with dynamic modulus, a nonlinear kinetic equation was set up to describe the cure reaction. The results show that, this paper has put forward a method based on rheokinetics, to study the curing rate of UV curing system, and provided a new approach to study UV cure reaction.

Improved Water Resistance of Waterborne Polyurethane

2010 ◽  
Vol 168-170 ◽  
pp. 1796-1800
Author(s):  
Sui Lian Luo ◽  
Guo Fei Gong ◽  
Jun Qiang Deng ◽  
Guang Shi ◽  
Hong Zhu
Keyword(s):  
Water Resistance ◽  
Uv Light ◽  
Uv Curing ◽  
Waterborne Polyurethane ◽  
Side Chain ◽  
Strength Increase ◽  
Application Time ◽  
Extension Agent ◽  
Polyurethane Resin ◽  
Tensile Strength Increase

The introduction of hydrophilic groups, such as -COOH, -SO3, -OH, -O-, into the polyurethane resin, so that waterborne polyurethane products in the water resistance, solvent resistance, weather and other aspects of performance are worse than solvent borne systems. In our work, to improve the water resistance of the films for waterborne polyurethane, we incorporated C=C bond into the side chain of polyurethane by using pentaerythritol diacrylate as an extension agent. By measuring the cured polyurethane films absorption and mechanical properties, we determine the conditions for UV curing, 3% TMPME, photoinitiator (2959) and to UV light application time for 30s. With the increase of the amount PEDA, water resistance, hardness and tensile strength increase. Furthermore, with the improved water resistance, it is hoped that the performance of waterborne polyurethane can be comparative or superior to the solvent-borne systems.

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