Study on UV Curing Reaction of Nopadiene

2012 ◽  
Vol 557-559 ◽  
pp. 1921-1927
Author(s):  
Guan Hua Sui ◽  
Yan Ju Lu ◽  
Zhen Dong Zhao ◽  
Liang Wu Bi ◽  
Yu Xiang Chen
Keyword(s):  
Double Bond ◽  
Irradiation Time ◽  
Uv Curing ◽  
Acid Resistance ◽  
Alkali Resistance ◽  
Drying Time ◽  
Illumination Time ◽  
Irradiation Intensity ◽  
Curing Reaction ◽  
Conversion Rates

Properties of cured product which polymerizd by nopadiene and factors of curing reaction were researched. Conversion rate of the double bond was characterized and detected by FT-IR analysis, and mechanical properties of cured films were detected, too. Results showed that conversion of double bond increased firstly and then remained basically stable with the increasing of the dosage of initiators, and increased with the increase of irradiation time. Surface drying time become shorter, that is, relative curing speed become faster with the increasing of the dosage of photo-initiators and irradiation intensity, and the decreasing of the lamp distance, and conversion rates of the double bonds were 91.5 % , while illumination time 360 s in dosage of 8 % of Irgacure 6512 to the substrate were used at lamp distance 4.5 cm with 100 % irradiation intensity, respectively. The obtained UV cured coating exhibited some superior properties in flexibility, impact strength, adhesive power, hardness, acid resistance, alkali resistance, salt resistance, water resistance, and so on.

Study on Thermal-UV Curing Process of Waterborne Dual Crosslinkable Coating Material

2011 ◽  
Vol 311-313 ◽  
pp. 1451-1456 ◽  
Author(s):  
Liang Liang ◽  
Jing Guo ◽  
Fan Chu Zeng
Keyword(s):  
Double Bond ◽  
Thermal Radiation ◽  
Mild Condition ◽  
Uv Curing ◽  
Alkali Resistance ◽  
Functional Monomer ◽  
Curing Process ◽  
Naoh Solution ◽  
Michael Type Addition ◽  
Uv Curing Process

A waterborne thermal-radiation dual crosslinkable polyacrylate was prepared by introducing an AAEM functional monomer and a C=C double bond by Michael Type Addition in a relatively mild condition. The optimal synthesizing and curing processes were also studied. The performance of this coating is excellent: the film is hardness 2H, alkali-resistance (5% NaOH solution) >20h, ethanol-resistant >150 times of rub without film breaking.

scholarly journals Preparation of fluorine-free superhydrophobic and wear-resistant cotton fabric with a UV curing reaction for self-cleaning and oil/water separation

RSC Advances ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 4660-4671
Author(s):  
Yaofa Luo ◽  
Shuang Wang ◽  
Xihan Fu ◽  
Xiaosheng Du ◽  
Haibo Wang ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Uv Curing ◽  
Water Separation ◽  
Wear Resistant ◽  
Curing Reaction ◽  
Oil Water Separation ◽  
Oil Water ◽  
Self Cleaning

A durable superhydrophobic, self-cleaning cotton fabric based on UV curing was prepared and used in the field of oil/water separation.

Однофотонное излучение одиночной квантовой точки CdTeSe/ZnS в ближнем инфракрасном диапазоне при комнатной температуре

2021 ◽  
Vol 47 (21) ◽  
pp. 3
Author(s):  
Siyue Jin ◽  
Xingsheng Xu
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Auger Recombination ◽  
Single Photon ◽  
Irradiation Time ◽  
Colloidal Quantum Dots ◽  
Single Quantum ◽  
Illumination Time ◽  
Single Quantum Dots ◽  
Single Quantum Dot

In this study, the photostability of a CdTeSe/ZnS colloidal single photon emitter with a wavelength of 800nm at room temperature was investigated. The second-order correlation function was much smaller than 0.1, which proved that the CdTeSe/ZnS single quantum dot at 800nm is a highly pure single-photon emitter. The effects of the irradiation time on the optical properties from single quantum dots were analyzed. As the illumination time increased, the emission of biexciton and multiexciton in the colloidal quantum dots increased, and the occurrence of Auger recombination increased.

scholarly journals Preparation of high permeable alumina ceramic membrane with good separation performance via UV curing technique

RSC Advances ◽  
2018 ◽  
Vol 8 (24) ◽  
pp. 13567-13577 ◽  
Author(s):  
Yang Liu ◽  
Weiya Zhu ◽  
Kang Guan ◽  
Cheng Peng ◽  
Jianqing Wu
Keyword(s):  
Ceramic Membrane ◽  
Uv Curing ◽  
Ceramic Membranes ◽  
Dip Coating ◽  
Alumina Ceramic ◽  
Separation Performance ◽  
Good Separation ◽  
Drying Time ◽  
Coating Method ◽  
Dip Coating Method

The traditional dip-coating method for preparation of ceramic membranes requires a long drying time and easily produces drying defects. In this work, an improved dip-coating process was proposed.

scholarly journals Durability Studies on Concrete Made Using Pulverized Used Foundry Sand as A Mineral Admixture

2018 ◽  
Vol 7 (3.3) ◽  
pp. 10
Author(s):  
Salim P M ◽  
B S.R.K.Prasad ◽  
Seshadri Sekhar.T
Keyword(s):  
Sulfuric Acid ◽  
Sodium Hydroxide ◽  
Acid Resistance ◽  
Sodium Sulphate ◽  
Mineral Admixture ◽  
Alkali Resistance ◽  
Main Concern ◽  
Test Results ◽  
Foundry Sand ◽  
Ordinary Concrete

Durability of the structures is a main concern now a day due to the various types of deteriorations caused by natural as well as manmade environmental conditions. In this project the durability properties of concrete made with pulverized used foundry sand as a mineral admixture is analyzed. The durability of concrete is mostly depends on the surrounding environment. The chemicals present in air and water are the main causes of deterioration of concrete in its life. So a deep study on the action of deteriorating chemicals on the concrete containing pulverized used foundry sand is initiated. Here M40 concrete is prepared with 0%,5%,10%,15% and 20% addition of pulverized used foundry sand to the cement content. Cubes of size 100mmx100mmx100mm were cast and tested for various parameters like Acid resistance with hydrochloric acid and sulfuric acid, Sulphate attack with sodium sulphate and alkali resistance with sodium hydroxide for. The testing was performed on cubes at 28day, 56 day, 90 day and 180 day stored in respective chemicals dissolved in water at 5% concentration. From the test results it is inferred that the concrete containing pulverized used foundry sand is better in acid resistance than ordinary concrete without pulverized used foundry sand. Further the acid resistance for both hydrochloric and sulfuric acid shows an increase up to 15% addition of pulverized used foundry and after that it is slightly reduced. The samples subjected to sodium sulphate and sodium hydroxide has shown no variation in properties with respect to the water cured specimens.  

scholarly journals Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1456 ◽  
Author(s):  
Yuxin Chen ◽  
Baowei Li ◽  
Yu Shi ◽  
Shunli Ouyang
Keyword(s):  
Plastic Deformation ◽  
Dislocation Density ◽  
Raw Materials ◽  
Acid Resistance ◽  
Metal Phase ◽  
Alkali Resistance ◽  
Mechanism Analysis ◽  
Iron Concentrate ◽  
Average Grain Size ◽  
Deformation Ability

Fe-Al2O3 composites were prepared by pressureless sintering, using Bayan Obo iron concentrate and bauxite as the main raw materials, activated carbon was added as the reducing agent. The effects of different bauxite additions on the phase composition, microstructures, mechanical properties, and the corrosion-resistance were investigated. The results show that the average grain size of alumina decreased as the bauxite content increased. In addition, bauxite contains TiO2, CaO, and MgO, that can form a liquid phase at high temperature, causing the heat capacity of the micro-zone around the metal phase to be different, which leads to a change of undercooling and further affects the dislocation density of the metal phase. The plastic deformation ability of the metal phase can be improved with the low dislocation density. Fracture mechanism analysis indicated that the metal phase absorbed energy through plastic deformation. The optimum performance of the sample was as follows: the flexural strength was 310 MPa, the hardness 12.14 GPa, the alkali resistance 98.32%, and the acid resistance 95.44%.

RESULTS OF RESEARCH TO ASSESS THE EFFECT OF PRE-SOWING UV TREATMENT AND ARTIFICIAL LIGHTING MODES DURING LUPINE GERMINATION ON VITAMIN FEED

2021 ◽  
pp. 36-42
Author(s):  
VLADIMIR YU. STRAKHOV ◽  
◽  
SERGEY V. VENDIN ◽  
YURIY V. SAENKO ◽  
◽  
...  
Keyword(s):  
Experimental Data ◽  
Response Function ◽  
Irradiation Time ◽  
Experimental Studies ◽  
Biologically Active ◽  
Uv Disinfection ◽  
Uv Treatment ◽  
Illumination Time ◽  
Artificial Lighting ◽  
Germinating Seeds

One of the ways to increase the nutritional value of feed is the use of a biologically active additive based on sprouted grain. The positive use of sprouted grain of wheat and barley has been reliably established. At the same time, the possibilities of using sprouted grain of lupine are considered much less frequently. The authors have described technique and presented the results of experimental studies on assessing the eff ect of pre-sowing UV treatment and artifi cial illumination modes during lupine germination on vitamin feed. The time of UV treatment aimed at disinfection before germination and the time of grain illumination with a phytolamp during germination were chosen as the variable factors, and the length of the shoots was chosen as the response function. The range of seed illumination was from 4 to 10 h, and the UV irradiation time was from 60 to 300 s. The germination period was 5 days. Samples exposed to natural light served as control. According to the experimental data, a regression equation was obtained that describes the eff ect of UV disinfection and illumination time during growth on the length of the shoots, and graphical dependences of the change in the response function in the intervals of variation of the infl uencing factors were constructed. Experimental data have shown that an increase in the time of UV disinfection of seeds has a positive eff ect on the length of the shoots. It was revealed that on the fi fth day of germination, the maximum length of shoots (25 mm at 11 mm in control samples) was obtained with preliminary UV disinfection of germinating seeds for 300 s and 4-hour artifi cial illumination with a phytolamp. The expediency of using this technique when germinating lupine seeds for vitamin feed for animals has been experimentally confi rmed.

scholarly journals In situ monitoring of photocatalyzed isomerization reactions on a microchip flow reactor by IR-MALDI ion mobility spectrometry

2020 ◽  
Vol 412 (28) ◽  
pp. 7899-7911
Author(s):  
Chris Prüfert ◽  
Raphael David Urban ◽  
Tillmann Georg Fischer ◽  
José Villatoro ◽  
Daniel Riebe ◽  
...  
Keyword(s):  
High Throughput ◽  
Ion Mobility ◽  
Flow Reactor ◽  
Irradiation Time ◽  
In Situ Monitoring ◽  
Transfer Reactions ◽  
Reaction Yield ◽  
Reduced Pressure ◽  
Analytical Technique ◽  
Conversion Rates

Abstract The visible-light photocatalytic E/Z isomerization of olefins can be mediated by a wide spectrum of triplet sensitizers (photocatalysts). However, the search for the most efficient photocatalysts through screenings in photo batch reactors is material and time consuming. Capillary and microchip flow reactors can accelerate this screening process. Combined with a fast analytical technique for isomer differentiation, these reactors can enable high-throughput analyses. Ion mobility (IM) spectrometry is a cost-effective technique that allows simple isomer separation and detection on the millisecond timescale. This work introduces a hyphenation method consisting of a microchip reactor and an infrared matrix-assisted laser desorption ionization (IR-MALDI) ion mobility spectrometer that has the potential for high-throughput analysis. The photocatalyzed E/Z isomerization of ethyl-3-(pyridine-3-yl)but-2-enoate (E-1) as a model substrate was chosen to demonstrate the capability of this device. Classic organic triplet sensitizers as well as Ru-, Ir-, and Cu-based complexes were tested as catalysts. The ionization efficiency of the Z-isomer is much higher at atmospheric pressure which is due to a higher proton affinity. In order to suppress proton transfer reactions by limiting the number of collisions, an IM spectrometer working at reduced pressure (max. 100 mbar) was employed. This design reduced charge transfer reactions and allowed the quantitative determination of the reaction yield in real time. Among 14 catalysts tested, four catalysts could be determined as efficient sensitizers for the E/Z isomerization of ethyl cinnamate derivative E-1. Conversion rates of up to 80% were achieved in irradiation time sequences of 10 up to 180 s. With respect to current studies found in the literature, this reduces the acquisition times from several hours to only a few minutes per scan.

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