The Effect of Water-Soluble POSS on the Swelling Behavior of Hybrid PDMAEMA Nanocomposite Hydrogels

2014 ◽  
Vol 1044-1045 ◽  
pp. 145-148
Author(s):  
Yi Chen ◽  
Jun Hong Yang ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng
Keyword(s):  
Radical Polymerization ◽  
Water Soluble ◽  
Swelling Behavior ◽  
Swelling Ratio ◽  
Nanocomposite Hydrogels ◽  
Effect Of Water ◽  
Swelling Rate

The nanosized water-soluble Oa-POSS particles were added into the PDMAEMA hydrogels by in situ radical polymerization. The gels still show obvious temperature and pH double responsiveness. The swelling behavior including swelling ratio and swelling/deswelling rate is determined by the content of added Oa-POSS. With the increase of Oa-POSS, the swelling ratio decreases slightly, while the swelling rate and deswelling rate increases significantly, which is conducive to the application of this kind of gels.

The Swelling Behavior of Water-Soluble POSS Hybrid PNIPA Nanocomposite Hydrogels

2014 ◽  
Vol 1022 ◽  
pp. 34-37
Author(s):  
Yi Chen ◽  
Jun Hong Yang ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng
Keyword(s):  
Radical Polymerization ◽  
Water Soluble ◽  
Swelling Behavior ◽  
Swelling Ratio ◽  
Nanocomposite Hydrogels ◽  
Swelling Rate

The nanosized water-soluble Oa-POSS particles were added into the PNIPA hydrogels by in situ radical polymerization as a reinforce agent. The swelling behavior including swelling ratio and swelling/deswelling rate was determined by the composition of gels. With the increase of Oa-POSS, the swelling ratio decreases slightly, while the swelling rate and deswelling rate increases significantly, which is conducive to the application of this kind of gels.

The Compositional Effect of Water-Soluble POSS Hybrid PNIPA Nanocomposite Hydrogels

2014 ◽  
Vol 1044-1045 ◽  
pp. 133-136
Author(s):  
Yi Chen ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng ◽  
Jun Hong Yang
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Radical Polymerization ◽  
Network Structure ◽  
Compression Strength ◽  
Water Soluble ◽  
Elongation At Break ◽  
Compositional Effect ◽  
Nanocomposite Hydrogels

The nanosized water-soluble Oa-POSS particles were added into the PNIPA hydrogels by in situ radical polymerization as a reinforce agent. The mechanical properties are determined by the composition of gels. With the increase of Oa-POSS, the tensile and compression strength is enhanced significantly, while, the elongation at break is still low. The increased BIS, related to the tighter network structure, results in better compression strength, but the tensile properties is not improved obviously.

SET-LRP of NIPAM in water via in situ reduction of Cu(ii) to Cu(0) with NaBH4

2016 ◽  
Vol 7 (4) ◽  
pp. 933-939 ◽  
Author(s):  
Mikhail Gavrilov ◽  
Timothy J. Zerk ◽  
Paul V. Bernhardt ◽  
Virgil Percec ◽  
Michael J. Monteiro
Keyword(s):  
Electron Transfer ◽  
Radical Polymerization ◽  
Living Radical Polymerization ◽  
Water Soluble ◽  
New Method ◽  
Single Electron Transfer ◽  
In Situ Reduction ◽  
Water Soluble Polymers ◽  
Soluble Polymers

The direct and quantitative reduction of the air-stable Cu(ii)Br2/Me6TREN to Cu(0) by NaBH4 represents a new method for the aqueous single electron transfer-living radical polymerization (SET-LRP) of water soluble polymers.

EFFECT OF PHBV CONTENT ON THE TRANSPARENCY AND SWELLING BEHAVIOR OF POLYMER/HECTORITE NANOCOMPOSITE HYDROGEL

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1365-1370 ◽  
Author(s):  
QINGSONG ZHANG ◽  
YIPING ZHAO ◽  
LI CHEN
Keyword(s):  
Gravimetric Method ◽  
Polymer Chains ◽  
Swelling Kinetics ◽  
Swelling Ratio ◽  
Nanocomposite Hydrogels ◽  
Cross Linker ◽  
Kinetics Of ◽  
Inorganic Network ◽  
Pure Poly

As a kind of novel biopolymer material with good biodegradability and biocompatibility, poly(β-hydroxybutyrate-co-valerate)(PHBV) was introduced into organic/inorganic network structure of nanocomposite hydrogels prepared by in-situ free-radical polymerization based on monomer N-isopropylacrylamide(NIPAM) and physical cross-linker hectorite. As viewed from appearance of the hydrogels, obvious change occurred from transparent to white with the increase of PHBV content, which reflects the structural shift from homogeneity to inhomogeneity. The swelling ratio and swelling kinetics of thermo-sensitive poly( NIPAM / PHBV /Hectorite) hydrogels with different PHBV content was investigated by gravimetric method. It was found that the incorporation of PHBV decreases the swelling ratio of pure poly( NIPAM /Hectorite) hydrogels on account of hydrophobicity of PHBV . Furthermore, in the case of swelling kinetics, the result of linear regression shows that relaxation of polymer chains of the hydrogels controls the swelling process.

A Recrosslinkable Preformed Particle Gel for Conformance Control in Heterogeneous Reservoirs Containing Linear-Flow Features

SPE Journal ◽  
2019 ◽  
Vol 24 (04) ◽  
pp. 1714-1725 ◽  
Author(s):  
Jingyang Pu ◽  
Baojun Bai ◽  
Ali Alhuraishawy ◽  
Thomas Schuman ◽  
Yashu Chen ◽  
...  
Keyword(s):  
Oil Fields ◽  
Effect Of Temperature ◽  
Swelling Ratio ◽  
Heterogeneous Reservoirs ◽  
Preformed Particle Gel ◽  
Flow Features ◽  
Swelling Rate ◽  
Equilibrium Swelling Ratio ◽  
Preformed Particle Gels

Summary Preformed particle gels (PPGs) have been successfully applied to control conformance for mature oil fields because of their advantages over conventional in-situ gels. However, field applications have demonstrated that current particle gels cannot efficiently plug open fractures, fracture-like channels, or conduits that exist in many mature oil fields. The objective of this study is to systematically evaluate a new recrosslinkable-PPG (RPPG) product that can be used to efficiently control the conformance for abnormal features. The RPPG can swell to 38 times its initial volume, and the equilibrium swelling ratio is independent of the brine salinity. Temperature and the particle size showed a gradient effect on the swelling rate of the gel. Additionally, the particle gels can recrosslink to form a rubber-like bulky material in the large-opening features after placement that significantly enhances the plugging efficiency. We systematically evaluated the effect of temperature and RPPG swelling ratio on the recrosslinking time, the gel strength after crosslinking, and the gel thermostability. Coreflooding tests were run to test whether RPPG can significantly improve the fracture-plugging efficiency compared with a traditional PPG that cannot recrosslink after pumping. The RPPG can be customized for mature reservoirs with a temperature from 23 to 80°C with a controllable size from tens of nanometers to a few millimeters. The recrosslinking time can be controlled from 2 to 80 hours, depending on the swelling ratio and temperature. The gel elastic modulus after recrosslinking can achieve from 300 to 10 800 Pa, depending on the swelling ratio and the temperature. Coreflooding tests showed that the breakthrough pressure of the recrosslinked RPPG can reach up to 300 psi/ft for a fracture with a 0.2-cm aperture, which is more than five times higher than that of the conventional PPG.

Novel rapid response clay/poly(N-isopropylacrylamide) nanocomposite hydrogels by post treatment with HCl solution

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Ma Yun ◽  
Liu Yang ◽  
Jiang Yongmei ◽  
Yu Hao ◽  
Zhu Meifang
Keyword(s):  
Response Rate ◽  
Clay Content ◽  
Post Treatment ◽  
Rapid Response ◽  
Swelling Ratio ◽  
Nanocomposite Hydrogels ◽  
Hcl Solution

AbstractA series of high clay content Laponite XLS/poly (N-isopropylacrylamide) (PNIPAAm) nanocomposite hydrogels (S-N gels) have been successfully prepared by in-situ ultraviolet (UV) initiated polymerization. The effects of post treatment with HCl solution on swelling/deswelling behaviour of the S-N gels have been investigated in detail. The results indicate that the Laponite XLS/PNIPAAm nanocomposite hydrogels with HCl solution post treatment (S-N-H gels) exhibit great swelling ratio and rapid deswelling response rate; much higher and faster than other reported clay/PNIPAAm nanocomposite hydrogels.

scholarly journals Thermo-responsive hydrogels based on poly(N-isopropyl-acrylamide) and hyaluronic acid cross-linked with nanoclays

2020 ◽  
Vol 85 (9) ◽  
pp. 1197-1221 ◽  
Author(s):  
Ilinka Mirkovic ◽  
Marija Nikolic ◽  
Sanja Ostojic ◽  
Jelena Maletaskic ◽  
Zoran Petrovic ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Water Soluble ◽  
Nanocomposite Hydrogels ◽  
Dsc Measurements ◽  
Isopropyl Acrylamide ◽  
Hydrogel Network ◽  
Responsive Hydrogels

Semi-interpenetrating polymer networks (SIPN) based on thermoresponsive poly(N-isopropylacrylamide) (PNIPA) and water-soluble sodium salts of linear hyaluronic acid (Na-HA) were physically cross-linked with synthetic nanoclay (laponite XLG). PNIPA hydrogels with different cross-linking densities and Na-HA concentrations were synthesized by in situ free-radical redox polymerization. The structure and heterogeneity of the semi-IPN hydrogels were examined by SEM and XRD. The content of clay incorporated in the gel was determined by TGA. DSC measurements showed that volume phase transition temperature and its enthalpy varied with the clay and hyaluronic acid content. SIPN hydrogels containing negatively charged polyelectrolyte, Na- HA, exhibited higher Qe and faster deswelling rates than the corresponding PNIPA NC hydrogels. The presence of the anionic Na-HA polymer reduced the storage modulus, indicating a weakening of the hydrogel network structure, especially at lower clay contents. The nanocomposite hydrogels exhibited high tan ? values, which increased with increasing Na-HA content.

scholarly journals One-Step Photocontrolled Polymerization-Induced Self-Assembly (Photo-PISA) by Using In Situ Bromine-Iodine Transformation Reversible-Deactivation Radical Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 150 ◽  
Author(s):  
Haihui Li ◽  
Qinghua Xu ◽  
Xiang Xu ◽  
Lifen Zhang ◽  
Zhenping Cheng ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Self Assembly ◽  
Solid Content ◽  
Transition Metal Catalysts ◽  
Water Soluble ◽  
Step Method ◽  
Reversible Deactivation ◽  
One Step ◽  
Reversible Deactivation Radical Polymerization

Polymerization-induced self-assembly (PISA) has become an effective strategy to synthesize high solid content polymeric nanoparticles with various morphologies in situ. In this work, one-step PISA was achieved by in situ photocontrolled bromine-iodine transformation reversible-deactivation radical polymerization (hereinafter referred to as Photo-BIT-RDRP). The water-soluble macroinitiator precursor α-bromophenylacetate polyethylene glycol monomethyl ether ester (mPEG1k-BPA) was synthesized in advance, and then the polymer nanomicelles (mPEG1k-b-PBnMA and mPEG1k-b-PHPMA, where BnMA means benzyl methacrylate and HPMA is hydroxypropyl methacrylate) were successfully formed from a PISA process of hydrophobic monomer of BnMA or HPMA under irradiation with blue LED light at room temperature. In addition, the typical living features of the photocontrolled PISA process were confirmed by the linear increase of molecular weights of the resultant amphiphilic block copolymers with monomer conversions and narrow molecular weight distributions (Mw/Mn < 1.20). Importantly, the photocontrolled PISA process is realized by only one-step method by using in situ photo-BIT-RDRP, which avoids the use of transition metal catalysts in the traditional ATRP system, and simplifies the synthesis steps of nanomicelles. This strategy provides a promising pathway to solve the problem of active chain end (C-I) functionality loss in two-step polymerization of BIT-RDRP.

Functional Poly(p-Xylylene)s via Chemical Reduction of Poly(p-Phenylene Vinylene)s

2019 ◽  
Author(s):  
Ain Uddin ◽  
Weifan Sang ◽  
Yong Gao ◽  
Kyle Plunkett
Keyword(s):  
Film Formation ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Phenylene Vinylene ◽  
Polymer Modification ◽  
Polymer Backbone ◽  
Crosslinking Process ◽  
Conducting Membranes ◽  
In Situ Crosslinking

The synthesis of poly(p-xylylene)s (PPXs) with sidechains containing alkyl bromide functionality, and their post-polymer modification, is described. The PPXs were prepared by a diimide hydrogenation of poly(p-phenylene vinylene)s (PPVs) that were originally synthesized by a Gilch polymerization. The polymer backbone reduction was carried out with hydrazine hydrate in toluene at 80 °C to provide polymers with the sidechain-containing bromide functionality intact. To demonstrate post-polymer modification of the sidechains, the resulting PPX polymers were modified with trimethylamine to form tetraalkylammonium ion functionality and were evaluated as anion conducting membranes. While PPX homopolymers containing tetralkylammonium ions were completely water soluble and not able to form valuable films, PPX copolymers containing mixed tetraalkylammonium ions and hydrophobic chains were capable of film formation and alkaline stability. In addition, an in situ crosslinking process that used N,N,N',N'-tetramethyl-1,6-hexanediamine during the tetraalkylammonium formation of brominated PPX polymers was also evaluated and gave reasonable films with conductivities of ~10 mS-cm-1.

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