Photo Polymerization of Thiol-Hyperbranched Polysilazanes

2013 ◽  
Vol 683 ◽  
pp. 266-270 ◽  
Author(s):  
Jia Le Song ◽  
Peng Wei Hao ◽  
Chao Qiang Ye ◽  
Li Xin Chen ◽  
Wei Guang Li
Keyword(s):  
Activation Energy ◽  
Uv Curing ◽  
Polymerization Rate ◽  
Initiator Concentration ◽  
Uv Curable ◽  
Photo Polymerization ◽  
Autocatalytic Model ◽  
Theoretical Predictions ◽  
Double Bond Conversion ◽  
Kinetics Of

The kinetics of UV curable thiol-hyperbranched polysilazanes (HBP) was studied by differential photo-scanning calorimeter (DPC) technology. The effects of photo initiator concentration [I], light intensity I0and temperature on the UV curing rate and the final unsaturated double bond conversion of thiol-HBP were investigated. The results indicate that the dependence of polymerization rate Rp on [I] and I0, respectively, was found to fit with theoretical predictions very well at [I] no more than 0.50wt% and I0lower than 19.40mW/cm2. The kinetic parameters were calculated by autocatalytic model, and correspondingly, the total apparent reaction exponent and apparent activation energy are 8.76 and 13.97kJ/mol, respectively.

Study on the UV Curing Reactivity of Micro-Injection UV-Curing Molding

2018 ◽  
Vol 777 ◽  
pp. 65-69
Author(s):  
Jia Wei Li ◽  
Jian Yun He ◽  
Xi Dan Luo ◽  
Chang Song Zhao ◽  
Peng Cheng Xie ◽  
...  
Keyword(s):  
Uv Light ◽  
Uv Curing ◽  
Process Conditions ◽  
Uv Curable ◽  
Functional Monomers ◽  
Molding Method ◽  
Curing Reaction ◽  
Double Bond Conversion ◽  
Light Curing ◽  
Kinetics Of

In this paper, UV irradiation curing technology is used in the processing and manufacturing of micro structure parts and a micro-injection molding method of UV-curable molding was proposed to process microstructures. The special material for UV light curing injection of microstructural products was developed. The light curing reactivity of the micro injection light curing special material and its effect on the processing molding are studied. The kinetics of light curing reaction of UV curing injecting material were studied by online infrared spectroscopy (RT-IR). The contribution of mono functional monomers to the double bond conversion rate of microstructures is higher than that of high functional monomers. Under the same condition, the mono functional monomer can make the UV curing reaction more complete. Under the same process conditions, the rate of UV curing reaction of high functional monomers is higher than that of mono functional monomers.

Application of New Emulsifier on Acrylic Emulsion Polymerization

2012 ◽  
Vol 554-556 ◽  
pp. 236-239
Author(s):  
Shi Gao Song ◽  
Shao Guo Wen ◽  
Ji Hu Wang ◽  
Yan Shen
Keyword(s):  
Activation Energy ◽  
Emulsion Polymerization ◽  
Correlation Coefficient ◽  
Polymerization Rate ◽  
Initiator Concentration ◽  
Acrylic Emulsion ◽  
Alkyl Glycosides ◽  
New Type ◽  
The Relationship ◽  
Emulsifier Concentration

In this paper, we studied the influence of the amount of alkyl glycosides emulsifier, reaction temperature and the amount of initiator on emulsion polymerization kinetics. The results show that when we apply the new alkyl glycosides emulsifier in acrylic emulsion polymerization, the relationship between polymerization rate Rp and emulsifier concentration [S] is Rp∝[S]0.70 and the correlation coefficient is 0.93; the relationship between polymerization rate Rp and the initiator concentration [I] is Rp∝[I]1.00 and the correlation coefficient is 0.86; the apparent activation energy of polymerization is 32.34KJ/mol and the correlation coefficient is 0.93. We got good results after applying the new type emulsifier in acrylic emulsion polymerization.

Synthesis and Curing Kinetics of UV-Curable Waterborne Bisphenol-S Epoxy Acrylate/Polyurethane-Acrylate Coating

2012 ◽  
Vol 549 ◽  
pp. 457-461
Author(s):  
Jun Gang Gao ◽  
Feng Li Zhu ◽  
Jiang Bo Yang ◽  
Xiao Qian Liu
Keyword(s):  
Uv Curing ◽  
Curing Kinetics ◽  
Mechanical Analysis ◽  
Curing Temperature ◽  
Coating Film ◽  
Epoxy Acrylate ◽  
Bisphenol S ◽  
Uv Curable ◽  
Polyurethane Acrylate ◽  
Kinetics Of

In ouder to prepare the waterborne UV-curable polyurethane acrylate coatings, the anionic polyurethane acrylate emulsifier and bisphenol-S eopxy acrylate were synthesized. The curing process, kinetics and properties of waterborone UV-curable epoxy acrylate/polyurethanes acrylate coating were investigated by FTIR, DSC and DMA. The results show that the static initial curing temperature Ti is 52.36 oC, peak temperature Tp is 71.58 oC, the finished temperature Tf is 89.15 oC. The curing reaction can be described by two-parameter autocatalytic Šesták-Berggren (S-B) model.This coating has a better UV-curing property. The dynamic mechanical analysis showed that the glass transition temperature Tg of coating film is 52.70 oC.

Kinetics of Inverse Emulsion Copolymerization of Dimethyl Diallyl Ammonium Chloride and Acrylamide

2014 ◽  
Vol 989-994 ◽  
pp. 348-351 ◽  
Author(s):  
Xiao Na Wang ◽  
Ren Zhi Zhang ◽  
Ni Sha Jin
Keyword(s):  
Activation Energy ◽  
Intrinsic Viscosity ◽  
Initial Temperature ◽  
Tween 80 ◽  
Polymerization Rate ◽  
Emulsion Copolymerization ◽  
Inverse Emulsion ◽  
Rate Of Polymerization ◽  
Span 80 ◽  
Kinetics Of

Inverse emulsion copolymerization of DMDAAC with AM has been investigated by the dilatometer technique using the mixture of Span-80 and Tween-80 as the composite emulsifier and 2,2’-azobis (2-methylpropionconidine) dihydro chloride as the initiator. In inverse emulsion copolymerization, the influences of the concentrations of monomers, emulsifier and initiator and initial temperature on polymerization rate and the intrinsic viscosity of polymer have been examined. Its kinetics can be expressed as,. The overall activation energy for the rate of polymerization was determined with a dilatometer as 20.33 kJ/mol over the temperature range 35-55°C.

Curing Kinetics of Cyano Functionalized Benzoxazine

2011 ◽  
Vol 233-235 ◽  
pp. 2337-2340
Author(s):  
Wen Jin Chen ◽  
Xiao Bo Liu
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Theoretical Calculations ◽  
Curing Kinetics ◽  
High Thermal Stability ◽  
Order Model ◽  
Scanning Calorimetry ◽  
Autocatalytic Model ◽  
Kinetics Of

A multifunctional benzoxazine monomer (BZCN) was synthesized, which has several outstanding properties, such as high thermal stability and high glass transition. To better understand the curing kinetics of BZCN, isothermal differential scanning calorimetry measurements were used to determine the kinetic parameters and the kinetic models of the curing processes of benzoxazine monomer with cyano functionality. The result shows the mechanism of the curing reaction of BZCN exhibits autocatalytic model, but doesn’t meet nth-order model. Owing to the effects of catalysis of cyano functionality, the activation energy is 89.65KJ•mol-1and the total order of reaction is 1.84, which is quite different from that of normal benzoxazine. The theoretical calculations matched reasonably well with the experimental results.

Synthesis and UV curing kinetics of rapidly UV-curable hyperbranched polycarbosiloxanes

2010 ◽  
Vol 59 (10) ◽  
pp. 1323-1330 ◽  
Author(s):  
Sheng-Jie Wang ◽  
Xin Liu ◽  
Jie Kong ◽  
Wei Tian ◽  
Xiao-Dong Fan ◽  
...  
Keyword(s):  
Uv Curing ◽  
Curing Kinetics ◽  
Uv Curable ◽  
Kinetics Of

Study of UV Curing Kinetics for Coating Containing Siloxane Modified Polyurethane-Acrylate

2013 ◽  
Vol 791-793 ◽  
pp. 175-178 ◽  
Author(s):  
Yu Song Qi ◽  
Jian Wen Yang ◽  
Zhao Hua Zeng ◽  
Yong Lie Chen
Keyword(s):  
Steady State ◽  
Incident Light ◽  
Uv Curing ◽  
Curing Kinetics ◽  
Initiator Concentration ◽  
Incident Light Intensity ◽  
Polyurethane Acrylate ◽  
Steady State Kinetics ◽  
Curing Kinetic ◽  
Kinetics Of

The UV curing kinetics of coating containing siloxane modified polyurethane-acrylate were studied using photo-DSC (DPC). The effects of some factors such as incident light intensity, initiator concentration, reaction temperature on the curing kinetics have been analysized from DPC data. The curing kinetic parameters (kp and kt) for prepolymers have also been determinedv by combining steady state and non-steady state kinetics.

Study on the Curing Kinetics of UV-Curable Inkjet Ink

2010 ◽  
Vol 174 ◽  
pp. 397-400 ◽  
Author(s):  
Ping Xiu Ni ◽  
Xian Fu Wei ◽  
Pei Qing Huang ◽  
Wei Wei
Keyword(s):  
Elastic Modulus ◽  
Induction Period ◽  
Functional Groups ◽  
Uv Curing ◽  
Curing Kinetics ◽  
Curing Time ◽  
Uv Curable ◽  
Functional Monomers ◽  
The Relationship ◽  
Kinetics Of

In order to make different UV curing inkjet ink system and test the relationship between the dynamic elastic modulus and UV curing time, the same monomer and pre-polymer were mixed in different proportions, and different functional monomers and pre-polymer were mixed. The results show that the larger the proportion of the pre-polymer and the greater the number of monomer functional groups, the shorter the induction period of the UV curing of UV inkjet ink system and the faster the UV curing rate. Then, the UV curing kinetics of UV inkjet inks was analyzed preliminarily.

The effect of electrondonors on the polymerization kinetics of isoprene

1980 ◽  
Vol 45 (12) ◽  
pp. 3338-3346
Author(s):  
Miroslav Kašpar ◽  
Jiří Trekoval
Keyword(s):  
Induction Period ◽  
Ethyl Ether ◽  
Reaction Order ◽  
Propagation Rate ◽  
Reaction Scheme ◽  
Polymerization Kinetics ◽  
Polymerization Rate ◽  
Constant Concentration ◽  
Initial Concentration ◽  
Kinetics Of

The effect of small additions of 1-octene, butyl ethyl ether and triethylamine on the polymerization kinetics of isoprene (2-methyl-1,3-butadiene) in benzene initiated with butyllithium was investigated by employing the GLC analysis. The addition of 1-octane was reflected only in a shorter induction period of the reaction; the effect on the propagation rate was insignificant. With the increasing amount of butyl ethyl ether, the polymerization rate increases linearly, while the reaction order with respect to the concentration of triethylamine is variable and increases from 0.33 to 0.66 with the increasing concentration of the initiator. For a constant concentration of triethylamine, the reaction order with respect to the initial concentration of the initiator was found to vary considerably, reaching even negative values. A reaction scheme was suggested, taking into account the competition between two different solvates of alkyllithium.

Effect of ionizing radiation on the kinetics of hydrogenation on the Ni-MgO mixed catalyst

1982 ◽  
Vol 47 (7) ◽  
pp. 1780-1786 ◽  
Author(s):  
Rostislav Kudláček ◽  
Jan Lokoč
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Liquid Phase ◽  
Ionizing Radiation ◽  
Oxide Catalyst ◽  
Absorbed Dose ◽  
Hydrogenation Rate ◽  
Solution Composition ◽  
Mixed Catalyst ◽  
Kinetics Of

The effect of gamma pre-irradiation of the mixed nickel-magnesium oxide catalyst on the kinetics of hydrogenation of maleic acid in the liquid phase has been studied. The changes of the hydrogenation rate are compared with the changes of the adsorbed amount of the acid and with the changes of the solution composition, activation energy, and absorbed dose of the ionizing radiation. From this comparison and from the interpretation of the experimental data it can be deduced that two types of centers can be distinguished on the surface of the catalyst under study, namely the sorption centres for the acid and hydrogen and the reaction centres.

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