scholarly journals The Sensitization of Aliphatic Epoxy Photopolymerization in Epoxy-Acrylate Interpenetrating Polymer Networks

2014 ◽  
Vol 2 (1) ◽  
pp. 5-9
Author(s):  
Tetiana Samoilenko ◽  
Nataliia Iarova ◽  
Halyna Menzheres ◽  
Oleksandr Brovko
Keyword(s):  
Ir Spectroscopy ◽  
Potential Application ◽  
Polymer Networks ◽  
Hardness Test ◽  
Interpenetrating Polymer Networks ◽  
Epoxy Acrylate ◽  
Adhesion Test ◽  
Pencil Hardness ◽  
Epoxy Polymers ◽  
Epoxy Groups

The paper discuses the phenomenon of the sensitization of the aliphatic epoxy photopolymerization in the presence of acrylate oligomers while forming epoxy-acrylate interpenetrating polymer networks. The photopolymerization process was studied by IR spectroscopy and the properties of the final products – by the Gardner test, crosshatch adhesion test, and the pencil hardness test. The epoxy groups conversion, which is rather low in aliphatic epoxy polymers, was found to alter with the increase of acrylate compounds content. The materials synthesized on the base of interpenetrating polymer networks were shown to reveal fine properties and may have a potential application as coatings.

scholarly journals Mutual sensibilization in epoxyacrylate interpenetrating polymer networks

2021 ◽  
pp. 149-158
Author(s):  
Oleksandr O. Brovko ◽  
◽  
Natalia V. Yarova ◽  
Tetiana F. Samoilenko ◽  
Larysa M. Yashchenko ◽  
...  
Keyword(s):  
Free Radical ◽  
Polymer Networks ◽  
Triethylene Glycol ◽  
Interpenetrating Polymer Networks ◽  
Degree Of Conversion ◽  
Epoxy Acrylate ◽  
Low Viscosity ◽  
First Case ◽  
Sensitizing Effect ◽  
Epoxy Groups

Using the method of IR spectroscopy, the kinetic features of the course of photoinitiated cationic and free radical polymerization in simultaneous epoxyacrylate interpenetrating polymer networks were investigated. The degree and rate of conversion of epoxy groups in the epoxy component (aliphatic diepoxide UP-650D, aliphatic-alicyclic triepoxide UP-650T, and diane epoxides ED-20 and Epicot 828), and the opening of double bonds in acrylate component (triethylene glycol dimethacrylate) were determined. The sensitizing effect of the acrylate component on the degree of conversion of epoxy groups in IPNs with aliphatic diepoxide or aliphatic-alicyclic triepoxide with an epoxy/acrylate ratio of 50/50 wt. % was revealed. For diane epoxies, the opposite regularity of conversion of epoxy groups in the composition of epoxy-acrylate IPNs is observed: in comparison with initial polymer networks, the degree of conversion of epoxy groups was significantly reduced. In the first case of low-viscosity aliphatic and cycloaliphatic epoxides such a sensitization is occurred due to the fact that the simultaneous polymerization of acrylate via a free radical mechanism promotes the decomposition of the photoinitiator and the formation of more macrocations quantity. In second case of more viscous diane epoxy resins, the spatial restriction imposed by the rapidly formed acrylate networks is predominate. That is why the conversion of epoxy groups is reduced and this effect is neutralized.

Influence of N-vynilcarbazole on the photopolymerization process and properties of epoxy-acrylate interpenetrating polymer networks

e-Polymers ◽  
2016 ◽  
Vol 16 (6) ◽  
pp. 429-435
Author(s):  
Tetiana F. Samoilenko ◽  
Natalia V. Iarova ◽  
Svitlana M. Ostapiuk ◽  
Maksym H. Tkalich ◽  
Liubov O. Vorontsova ◽  
...  
Keyword(s):  
Single Phase ◽  
Polymer Networks ◽  
Mechanical Analysis ◽  
Interpenetrating Polymer Networks ◽  
Epoxy Acrylate ◽  
Uv Lamp ◽  
Using Data ◽  
The Given ◽  
Kinetics Of ◽  
Epoxy Groups

AbstractPhotocured simultaneous epoxy-acrylate interpenetrating polymer networks (IPNs) were formed both under irradiation by UV-lamp and natural sunlight. The conversion degrees of functional groups were calculated by using data obtained from Fourier transform infrared (FTIR) spectroscopy. The influence of N-vynilcarbazole (NVC) as a photosensitizer on the kinetics of IPN photopolymerization was investigated. The conversion degrees of epoxy groups were revealed to increase significantly with the addition of NVC to the given systems. The phase morphology of IPNs was analyzed by optical and scanning electronic microscopy as well as by dynamic mechanical analysis (DMA). The data obtained using DMA method, which was used for analyzing the IPN samples with different component ratios, indicate the formation of both phase-separated and single-phase IPNs. The phase separation is occurred only in NVC-containing 50:50 IPN.

KINETICS OF FORMATION AND PROPERTIES OF PHOTOCURED SIMULTANEOUS EPOXY-ACRYLATE IPNS WITH THE PREVAILING CONTENT OF AN EPOXY COMPONENT

2021 ◽  
Vol 43 (4) ◽  
pp. 287-294
Author(s):  
N.V. YAROVA ◽  
◽  
T.F. SAMOILENKO ◽  
L.M. YASHCHENKO ◽  
O.O. BROVKO ◽  
...  
Keyword(s):  
Free Radical ◽  
Cationic Polymerization ◽  
Polymer Networks ◽  
Weight Ratio ◽  
Interpenetrating Polymer Networks ◽  
Radical Mechanism ◽  
Accelerated Weathering ◽  
Epoxy Acrylate ◽  
Double Bonds ◽  
Epoxy Groups

The distinct features of UV induced polymerization of epoxy-acrylate blends leading to the formation of simultaneous interpenetrating polymer networks (IPNs) have been studied. Different ratios of components within a prevailing content of an epoxy one have been used for the synthesis. Such a content of epoxy monomer is required to create a barrier preventing oxygen diffusion into a curing sample. It allows retardation of the well-known oxygen-inhibition effect, which acrylate monomers are susceptible to. Hence, the conduction of their polymerization in open-air conditions is possible. The proceeding of the polymerization reactions of acrylate (TEGDM) via free radical mechanism and of epoxy (UP-650D) via cationic one have been monitored by FTIR-spectroscopy. Namely, the conversion degrees have been calculated for double bonds of TEGDM and for epoxy groups of UP-650D respectively. A mixture of triphenylsulfonium hexafluorophosphate salts, which is capable of generating both free radical and cationic reactive species, have been used as a single photoinitiator for the formulations being investigated. Almost complete conversion of acrylate double bonds was reached after 60 min of UV irradiation irrespective of epoxy content. On the contrary, conversion of epoxy groups of aliphatic epoxy, which is known to be rather unreactive towards cationic photopolymerization, when mixed may be either higher or lower compared to the neat epoxy network. Such results are attributed to dual influence of acrylate network on the formation of epoxy one. Firstly, cationic polymerization of epoxy component is sensitized by acrylate macroradicals in terms of free radical promoted cationic polymerization. On the other hand, the mobility of epoxy macrocations is restricted by the rapid build-up of acrylate network. At the weight ratio of UP-650D and TEGDM 70/30 the sensitizing effect of acrylate is revealed to be dominant, so the given composition may be considered as optimal. Regardless of low conversion of epoxy groups, the content of the estimated gel fraction is high, and the epoxy component is found not to be leached in the process of extraction in acetone. Furthermore, physicomechanical properties of obtained UV-cured IPNs have been investigated. The results of the measurements, namely, impact resistance by the Gardner test, crosshatch adhesion test to different substrates (including silicon), and accelerated weathering test in a climatic chamber, show that all the samples exhibit good operational properties essential for effective protecting coatings of outdoor exposure.

Blending Property of Water-Based UV-Curable Polyurethane Acrylate and Epoxy Acrylate

2010 ◽  
Vol 174 ◽  
pp. 385-388
Author(s):  
Fu Qiang Chu
Keyword(s):  
Polymer Networks ◽  
Environmental Scanning Electron Microscopy ◽  
Interpenetrating Polymer Networks ◽  
Environmental Scanning ◽  
Epoxy Acrylate ◽  
Uv Curable ◽  
Polyurethane Acrylate ◽  
Water Based ◽  
Optical And Mechanical Properties ◽  
Printing Ink

Water-based UV-curable prepolymers are novel environmentally friendly materials. The blending property of two kinds of the prepolymers, water-based UV-curable polyurethane acrylate (UVPU) and water-based UV-curable epoxy acrylate (WEA), was studied in this paper. Blending compatibility, curing rate, optical and mechanical properties, and the cross-section morphology of the cured films of UVPU and WEA were investigated by Fourier transform infrared (FTIR), UV-visible spectrophotometer (UV-vis) and Environmental scanning electron microscopy (ESEM). Results indicated that the two prepolymers had good blending compatibility and high curing rate under UV radiation. The elongation at break of the cured film by WEA mixed with 20 wt% UVPU had 1.5 times increase compared to pure WEA, and the gloss increased 23% compared to pure UVPU, but the tensile strength decreased slightly. The morphology showed that the molecules of the two prepolymers polymerized each other and formed a network similar to the structure of Interpenetrating Polymer Networks (IPN). The comprehensive properties of the film were improved by blending of WEA and UVPU, and could be widely applied in the fields of coating varnish or printing ink.

Formation and Properties of UV-cured Dyane Epoxy Resins and Epoxy-Acrylate Interpenetrating Polymer Networks on their Base

2016 ◽  
Vol 38 (1) ◽  
pp. 40-46
Author(s):  
T.F. Samoilenko ◽  
◽  
N.V. Iarova ◽  
S.M. Ostapiuk ◽  
M.H. Tkalich ◽  
...  
Keyword(s):  
Epoxy Resins ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Epoxy Acrylate

scholarly journals Potential Application of a Visible Light-Induced Photocured Hydrogel Film as a Wound Dressing Material

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Aazadehsadat Hashemi Doulabi ◽  
Hamid Mirzadeh ◽  
Nasrin Samadi ◽  
Shadab Bagheri-Khoulenjani ◽  
Mohammad Atai ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Potential Application ◽  
Wound Dressing ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Vinyl Pyrrolidone ◽  
Cross Linking ◽  
Hydrogel Film ◽  
Swelling Degree ◽  
Hydrogel Films

The objective of this work was to prepare hydrogel films, as semi-interpenetrating polymer networks (semi-IPN), based on polyethylene glycol-co-fumarate (PEGF) and chitosan (Ch) blends. Hydrogel films were prepared by free radical cross-linking of PEGF, an unsaturated aliphatic polyester, in the presence of N-vinyl pyrrolidone (NVP), camphorquinone (CQ), and N,N-dimethyl-p-toluidine (DMPT) as a cross-linking, photoinitiating, and accelerating agent, respectively. The effect of NVP concentration on physicochemical and biological properties of semi-IPN film properties was evaluated. The sol fraction, water vapor transmission rate, and swelling degree of the hydrogel films were also investigated. Antibacterial activity against S. aureus was observed for the photocured blend hydrogels of Ch/PEGF with no toxicity to L929 cells according to the cell viability assays. Blend hydrogel films showing 600 ± 88% of equilibrium swelling degree in water and the lowest sol fraction (3.14 ± 1.22%) were obtained at 20 wt% of NVP content whilst preserving their own cytocompatibility and antibacterial activity. Therefore, this formulation was considered as an optimal semi-IPN blend hydrogel film composition with potential application for wound dressing.

Sign in / Sign up

Export Citation Format

Share Document