scholarly journals Structure and swelling of polymer-clay composites

2016 ◽  
Vol 11 (3) ◽  
pp. 213 ◽  
Author(s):  
R.S. Iminova ◽  
Sh.N. Zhumagalieva ◽  
M.K. Beisebekov ◽  
Zh.A. Abilov ◽  
G.A. Mun
Keyword(s):  
Morphological Structure ◽  
Bentonite Clay ◽  
Physiological Solution ◽  
Cross Linking ◽  
Swelling Degree ◽  
Degree Of Swelling ◽  
East Kazakhstan ◽  
Complex Polymer ◽  
Intercalative Polymerization

<p>Composition gels on the basis of bentonite clay of Manrak deposit (East-Kazakhstan region) and nonionogenic polymers - poly-2-hydroxyethyl-acrylate and polyacrylamide were synthesized by radical intercalative polymerization in situ with various content o f cross-linking agent N,N-methylene-bisacrylamide and with time of intercalation about 8 hours. The morphological structure, the nature of interaction of components and the swelling ability of composition gels were studied by scanner electron microscopy, equilibrium swelling and IR- spectroscopy methods. By studying of morphological structure it was determined, that the polymer-clay composition gels, synthesized by intercalative polymerization, are most homogenous and interconsistency in case of “acrylamide-clay” composition in contrast with “2-hydroxyethylacrylate-clay” composition. For “acrylamide-clay” gels the swelling degree of gels was stated to decrease with the increase in the content of cross-linking agent and ionic strength, but “2-hydroxyethylacrylate -clay” compositions have the extremely character of swelling, where maximum degree of swelling account for gel with content of cross-linking agent 1*10<sup>-2</sup>М. Interaction of composition components was realized on account of hydrogen bonds with formation of chemically cross-linked complex polymer-clay. Decrease of swelling degree of compositions in physiological solution points to acquisition of polyelectrolyte nature of composition gels on account of combination of nonionogenic macromolecules of polymers with negatively charged particles of bentonite clay. For intercalated samples of polymer-clay compositions, the degree of swelling at all degrees of cross-linking is between those for pure polymers and pure clay, that in turn, agrees with the conclusion on the great composition homogeneity of samples with preliminary intercalation. As of results of holding investigation fit is safe to say, that obtained polymer-clay composition gels are potential sorbents and prolongated carriers of medicine</p>

scholarly journals Composite Polymer-Clay Hydrogels Based on Bentonite Clay and Acrylates: Synthesis, Characterization and Swelling Capacity

2017 ◽  
Vol 19 (3) ◽  
pp. 279 ◽  
Author(s):  
Sh. Zhumagaliyeva ◽  
R. Iminovа ◽  
G. Kairalapova ◽  
М.M. Beysebekov ◽  
M.K. Beysebekov ◽  
...  
Keyword(s):  
Composite Materials ◽  
Hydrophobic Interactions ◽  
Bentonite Clay ◽  
Polymer Composition ◽  
Cross Linking ◽  
Ferrous Ions ◽  
Composite Gels ◽  
Starting Mixture ◽  
Swelling Capacity ◽  
East Kazakhstan

Clay minerals, especially montmorillonite, as well as bentonite minerals with a high content of montmorillonite, have the highest ability to adsorb various organic compounds. In the East Kazakhstan region, the Manyrak deposit has huge deposits of “pink” bentonite clay (BC) with 70% of montmorillonite, extensively studied back in the 70-80-s. Now it is successfully useful in the organo-polymer composition as a mineral filler of polymer composite materials (PCM) and finds the application as domestic sorbents for the group extraction of non-ferrous ions in the purification of industrial sewage and drinking water. This article presents the results of research of creating polymer-clay composite materials based on domestic bentonite clay with improved sorption characteristics. The polymeric matrix of the composites consists of acrylates ‒ polyacrylic and polymethacrylic acids (PAA and PMAA). BC-PAA and BC-PMAA gels were obtained by radical polymerization “in situ” using the intercalation method (and wi thout it). Preliminary intercalation forms more homogeneous and interconnected composite gels. An increase in the content of the clay component and the cross-linking agent in the starting mixture results in a higher cross-linking rate and compaction of the composite gels. The behavior of the swelling of gels under the influence of temperature, pH, ionic strength indicates their polyelectrolyte character with dominant hydrogen bonds and partial hydrophobic interactions (the latter is improved in the case of BC-PMAA). The preparation of composite gels based on local BC and PAA and PMAA expands the range of composite materials and can be used as sorbents for wastewater treatment.

Anticorrosive Properties of Epoxy/Polyurethane IPNs Coatings Modified by Organic Montmorillonite

2011 ◽  
Vol 675-677 ◽  
pp. 481-484 ◽  
Author(s):  
Shao Yun Shan ◽  
Qing Ming Jia ◽  
Li Hong Jiang ◽  
Ya Ming Wang
Keyword(s):  
Polymer Network ◽  
Electrochemical Analysis ◽  
Interpenetrating Polymer Network ◽  
Cross Linking ◽  
Tem Analysis ◽  
Organic Montmorillonite ◽  
Matrix Microstructure ◽  
Intercalative Polymerization

Epoxy/polyurethane interpenetrating polymer network coatings(EP/PU IPNs) modified by organic montmorillonite(oMMT)were prepared by interpenetrating polymer technology and in situ intercalative polymerization methods. TEM analysis showed that there is interaction between the oMMT and EP, PU phase, and the oMMT plays a role of "cross-linking point", changing the EP/PU matrix microstructure. Electrochemical analysis showed that oMMT and IPNs of EP and PU exhibits synergistic effect on improving anticorrosive properties of pure EP. When PU content is 30%, oMMT content is 3%, the EP/PU IPNs coatings has the best corrosion resistance.

Fabrication of poly(β-cyclodextrin-co-citric acid)/bentonite clay nanocomposite hydrogel: thermal and absorption properties

RSC Advances ◽  
2015 ◽  
Vol 5 (100) ◽  
pp. 82438-82449 ◽  
Author(s):  
Abolfazl Heydari ◽  
Hassan Sheibani
Keyword(s):  
Citric Acid ◽  
Bentonite Clay ◽  
Nanocomposite Hydrogel ◽  
Absorption Properties ◽  
Melt Intercalation ◽  
Intercalative Polymerization

A β-cyclodextrin (β-CD)/bentonite clay (BNC) nanocomposite hydrogel was prepared through combining in situ intercalative polymerization and melt intercalation methods.

Biopolymers with Medical Applications Optimized method for obtaining chitosan-based delivery systems

2018 ◽  
Vol 69 (7) ◽  
pp. 1756-1759 ◽  
Author(s):  
Luminita Confederat ◽  
Iuliana Motrescu ◽  
Sandra Constantin ◽  
Florentina Lupascu ◽  
Lenuta Profire
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Average Diameter ◽  
Delivery Systems ◽  
Cross Linking ◽  
Low Molecular Weight ◽  
Polymeric Systems ◽  
Chitosan Microparticles ◽  
Degree Of Swelling

The aim of this study was to optimize the method used for obtaining microparticles based on chitosan � a biocompatible, biodegradable, and nontoxic polymer, and to characterize the developed systems. Chitosan microparticles, as drug delivery systems were obtained by inotropic gelation method using pentasodiumtripolyphosphate (TPP) as cross-linking agent. Chitosan with low molecular weight (CSLMW) in concentration which ranged between 0.5 and 5 %, was used while the concentration of cross-linking agent ranged between 1 and 5%. The characterization of the microparticles in terms of shape, uniformity and adhesion was performed in solution and dried state. The size of the microparticles and the degree of swelling were also determined. The structure and the morphology of the developed polymeric systems were analyzed by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM).The average diameter of the chitosan microparticles was around 522 �m. The most stable microparticles were obtained using CSLMW 1% and TPP 2% or CSLMW 0.75%and TPP 1%. The micropaticles were spherical, uniform and without flattening. Using CSLMW in concentration of 0.5 % poorly cross-linked and crushed microparticles have been obtained at all TPP concentrations. By optimization of the method, stable chitosan-based micropaticles were obtained which will be used to develop controlled release systems for drug delivery.

scholarly journals Formation and cross-linking of fibrinogen layers monitored with in situ spectroscopic ellipsometry

2010 ◽  
Vol 75 (2) ◽  
pp. 410-417 ◽  
Author(s):  
T. Berlind ◽  
M. Poksinski ◽  
P. Tengvall ◽  
H. Arwin
Keyword(s):  
Spectroscopic Ellipsometry ◽  
Cross Linking

scholarly journals Interfacial engineering of lithium‐polymer batteries with in situ UV cross‐linking

InfoMat ◽  
2021 ◽  
Author(s):  
Ramin Rojaee ◽  
Samuel Plunkett ◽  
Md Golam Rasul ◽  
Meng Cheng ◽  
Vahid Jabbari ◽  
...  
Keyword(s):  
Cross Linking ◽  
Lithium Polymer Batteries ◽  
Interfacial Engineering

Stabilization of Peptide-Based Vesicles via in situ Oxygen-Mediated Cross-Linking

2012 ◽  
Vol 12 (9) ◽  
pp. 1220-1231 ◽  
Author(s):  
Adrian Sulistio ◽  
Anton Blencowe ◽  
Jiapei Wang ◽  
Gary Bryant ◽  
Xiaoqing Zhang ◽  
...  
Keyword(s):  
Cross Linking

TiCp2Cl-Catalyzed Living Radical and Ring Opening Polymerizations Initiated from Epoxides and Aldehydes in the Synthesis of Linear, Graft and Branched Polymers

2004 ◽  
Vol 856 ◽  
Author(s):  
Alexandru D. Asandei ◽  
Isaac W. Moran ◽  
Gobinda Saha ◽  
Yanhui Chen
Keyword(s):  
Electron Transfer ◽  
Ring Opening ◽  
Glycidyl Methacrylate ◽  
Ring Opening Polymerization ◽  
Branched Polymers ◽  
Single Electron Transfer ◽  
Radical Ring ◽  
Polymer Architectures ◽  
Complex Polymer

ABSTRACTTi(III)Cp2Cl-catalyzed radical ring opening (RRO) of epoxides or single electron transfer (SET) reduction of aldehydes generates Ti alkoxides and carbon centered radicals which add to styrene, initiating a radical polymerization. This polymerization is mediate in a living fashion by the reversible termination of growing chains with the TiCp2Cl metalloradical. In addition, polymers or monomers containing pendant epoxide groups (glycidyl methacrylate) can be used as substrates for radical grafting or branching reactions by self condensing vinyl polymerization. In addition, Ti alkoxides generated in situ by both epoxide RRO and aldehyde SET initiate the living ring opening polymerization of ε-caprolactone. Thus, new initiators and catalysts are introduced for the synthesis of complex polymer architectures.

Palladium immobilized on in situ cross-linked chitosan superfine fibers for catalytic application in an aqueous medium

2018 ◽  
Vol 42 (13) ◽  
pp. 11023-11030 ◽  
Author(s):  
Lulu Liang ◽  
Li Nie ◽  
Minjuan Jiang ◽  
Fusheng Bie ◽  
Linjun Shao ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Itaconic Acid ◽  
Cross Linking ◽  
Catalytic Application ◽  
Chitosan Composite

Chitosan composite superfine fibers with a diameter of 321 ± 99 nm were prepared by electrospinning with PEO as the co-spinning polymer and itaconic acid as the in situ cross-linking agent.

Bilayered Antimicrobial Nanofiber Membranes for Wound Dressings via in Situ Cross-Linking Polymerization and Electrospinning

2018 ◽  
Vol 57 (50) ◽  
pp. 17048-17057 ◽  
Author(s):  
Yanping Huang ◽  
Nianhua Dan ◽  
Weihua Dan ◽  
Weifeng Zhao ◽  
Zhongxiang Bai ◽  
...  
Keyword(s):  
Wound Dressings ◽  
Cross Linking ◽  
Nanofiber Membranes
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