scholarly journals Neutron investigation of interaction between anionic surfactant micelles and poly (ethylene glycol) polymer brush system

2021 ◽  
Vol 22 (2) ◽  
pp. 149-156
Author(s):  
O.P. Artykulnyi ◽  
◽  
M.M. Avdeev ◽  
Ye.M. Kosiachkin ◽  
V.I. Petrenko ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Anionic Surfactant ◽  
Structural Changes ◽  
Polymer Brush ◽  
Polymer Chains ◽  
Polymer Micelle ◽  
Poly Ethylene Glycol ◽  
Molecular Weights ◽  
Wide Range ◽  
Poly Ethylene

A polymer brush system of a neutral polymer poly (ethylene glycol) with a molecular weight of Mw = 20 kDa on silicon substrates in an aqueous medium was studied by the specular neutron reflectometry. Structural changes in the density profile of a polymer brush caused by the interaction of polymer chains with micelles of the anionic surfactant dodecylbenzenesulfonate acid were observed. The effect is shown to be related to the formation of molecular polymer-micelle associates in the bulk of the solution, which was previously studied by small-angle neutron scattering in a wide range of surfactant concentrations at various molecular weights of the polymer. The density of the dry polymer layer on the silicon substrate was additionally characterized by X-ray reflectometry and scanning atomic force microscopy.

Penetration of poly(ethylene glycol) into wood cell walls of red pine

Holzforschung ◽  
2007 ◽  
Vol 61 (3) ◽  
pp. 272-278 ◽  
Author(s):  
Dragica Jeremic ◽  
Paul Cooper ◽  
Peter Brodersen
Keyword(s):  
Ethylene Glycol ◽  
Cell Walls ◽  
Red Pine ◽  
Poly Ethylene Glycol ◽  
Molecular Weights ◽  
Tof Sims ◽  
Wide Range ◽  
Scanning Transmission ◽  
Poly Ethylene ◽  
Visualization Techniques

Abstract Penetration of poly(ethylene glycol) (PEG) with a wide range of molecular weights into cell walls of red pine wood was investigated. The study included bulking measurements and visualization of diffusion of brominated PEG by scanning transmission electron microscopy coupled to an energy-dispersive X-ray analyzer (STEM-EDXA) and a time-of-flight secondary ion mass spectrometer (ToF-SIMS). Both bulking and visualization techniques were in agreement, showing that all molecular weights of the polymer (PEG 1000, PEG 8000, and PEG 20000) are capable of penetrating cell walls. ToF-SIMS was more sensitive than STEM-EDXA, allowing visualization of lower amounts of brominated PEG. A trend to higher concentrations of PEG in the middle lamellae was observed.

scholarly journals Local Toxicity of Topically Administrated Thermoresponsive Systems: In Vitro Studies with In Vivo Correlation

2018 ◽  
Vol 47 (3) ◽  
pp. 426-432 ◽  
Author(s):  
Sivan Yogev ◽  
Ayelet Shabtay-Orbach ◽  
Abraham Nyska ◽  
Boaz Mizrahi
Keyword(s):  
Block Copolymer ◽  
Ethylene Glycol ◽  
Medical Devices ◽  
Poly Lactic Acid ◽  
Poly Ethylene Glycol ◽  
Thermoresponsive Polymers ◽  
Wide Range ◽  
Poly Ethylene

Thermoresponsive materials have the ability to respond to a small change in temperature—a property that makes them useful in a wide range of applications and medical devices. Although very promising, there is only little conclusive data about the cytotoxicity and tissue toxicity of these materials. This work studied the biocompatibility of three Food and Drug Administration approved thermoresponsive polymers: poly( N-isopropyl acrylamide), poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) tri-block copolymer, and poly(lactic acid-co-glycolic acid) and poly(ethylene glycol) tri-block copolymer. Fibroblast NIH 3T3 and HaCaT keratinocyte cells were used for the cytotoxicity testing and a mouse model for the in vivo evaluation. In vivo results generally showed similar trends as the results seen in vitro, with all tested materials presenting a satisfactory biocompatibility in vivo. pNIPAM, however, showed the highest toxicity both in vitro and in vivo, which was explained by the release of harmful monomers and impurities. More data focusing on the biocompatibility of novel thermoresponsive biomaterials will facilitate the use of existing and future medical devices.

scholarly journals Sizing and Thermal Stability of Prepared Tetraaminophthalocyaninatocopper(II) Derivatives-grafted Polymers

2016 ◽  
Vol 13 (2) ◽  
pp. 221-234
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thermal Stability ◽  
Ethylene Glycol ◽  
Group Analysis ◽  
Condensation Polymerization ◽  
Grafted Polymers ◽  
Poly Ethylene Glycol ◽  
Molecular Weights ◽  
Poly Ethylene ◽  
Thermal Stability Of ◽  
End Group

Different polymers were prepared by condensation polymerization of sebacic anhydride and adipic anhydride with ethylene glycol and poly(ethylene glycol). Their number average molecular weights were determined by end group analysis. Then, they were grafted on the prepared phthalocyaninatocopper(II) compounds with the general formula (NH2)4PcCu(II) having amino groups of 3,3',3'',3'''- or 4,4',4'',4'''- positions. All prepared polymers, compounds, and phthalocyaninatocopper(II)-grafted polymers were characterized by FTIR. The sizing measurements were carried out in 3,3',3'',3'''- (NH2)4PcCu(II) and 4,4',4'',4'''- (NH2)4PcCu(II) compounds with and without grafting polymers. The results showed that the grafting process led to decreasing in particle size and increasing in surface area. The grafting process was reflected positively on the thermal degradation of 3,3',3'',3'''- (NH2)4PcCu(II) and 4,4',4'',4'''- (NH2)4PcCu(II) grafted polymers. They had higher thermal stability accompanied with higher char residue and T50% weight loss with 3,3',3'',3'''-(NH2)4PcCu(II) and their grafted polymers being the best.

scholarly journals Synthetic scheme to improve the solid content of biodegradable waterborne polyurethane by changing the association relationships of hydrophilic fragments

RSC Advances ◽  
2020 ◽  
Vol 10 (48) ◽  
pp. 28680-28694 ◽  
Author(s):  
Zhihui Yang ◽  
Guangfeng Wu
Keyword(s):  
Ethylene Glycol ◽  
Waterborne Polyurethane ◽  
Solid Content ◽  
Synthetic Method ◽  
High Solid Content ◽  
Poly Ethylene Glycol ◽  
High Solid ◽  
Molecular Weights ◽  
Waterborne Polyurethanes ◽  
Poly Ethylene

A synthetic method was developed to prepare biodegradable waterborne polyurethanes (BHPUs) with a high solid content by introducing different molecular weights of poly(ethylene glycol) (PEG) into poly(ε-caprolactone) (PCL)-based polyurethanes.

A Poly(β-Amino Ester) of Spermine and Poly(ethylene Glycol) Diacrylate as a Gene Carrier

2007 ◽  
Vol 342-343 ◽  
pp. 425-428 ◽  
Author(s):  
Dhananjay Jere ◽  
Tae Hee Kim ◽  
Rohidas B. Arote ◽  
Hu Lin Jiang ◽  
Myung Haing Cho ◽  
...  
Keyword(s):  
Gene Delivery ◽  
Ethylene Glycol ◽  
Delivery System ◽  
Transfection Efficiency ◽  
Water Soluble ◽  
Gene Carrier ◽  
Gene Delivery System ◽  
Poly Ethylene Glycol ◽  
Wide Range ◽  
Poly Ethylene

Vectors are vital aspect of gene delivery system which decides the success of gene therapy. Efficient transfection with minimum or no toxicity, are two principal aims of any gene delivery system. In this our study, we rationally developed biodegradable water soluble poly(ßamino ester) (PAE) based on spermine (SPR) and poly (ethylene glycol) (PEG), by Michael-type addition reaction and further studied for its potential as a gene carrier. Confirmation of synthesized PAE was done by proton NMR spectroscopy. In gel retardation assay, the PAEs have shown good DNA binding ability over wide range of polyplexes. The addition of PEG over SPR resulted in a novel PAE with higher degree of safety and transfection efficiency as compared with polyethylenimine 25K (PEI) when studied in 293T human kidney carcinoma cells.

Dynamic Mechanical Behaviour of Poly Ethylene Glycol Plasticized Polylacticacid

2012 ◽  
Vol 576 ◽  
pp. 224-227
Author(s):  
M.R. Kaiser ◽  
Hazleen Anuar ◽  
Shamsul Bhari A. Razak
Keyword(s):  
Ethylene Glycol ◽  
Mechanical Analysis ◽  
Partial Replacement ◽  
Potential Candidate ◽  
Poly Ethylene Glycol ◽  
Screw Extruder ◽  
Dynamic Mechanical ◽  
Molecular Weights ◽  
Twin Screw ◽  
Poly Ethylene

Polylacticacid (PLA), produced from annually renewable, natural resources is a potential candidate for the partial replacement of petroleum based polymers and also for its biodegradability. PLA is well known for its better mechanical, thermal property but unfortunately the brittleness and rigidity limit its applicability. For a great number of applications such as packaging, fibers, films, etc., it is of high interest to formulate new PLA grades with improved flexibility and better impact properties. In order to develop PLA-based biodegradable packaging, the physico-mechanical properties of commercially available PLA should be modified using plasticizers. For this, PLA was melt-mixed with poly ethylene glycol (PEG) of 600 molecular weights by twin screw extruder. The thermal properties of plasticized PLA were characterized by utilization of dynamic mechanical analysis. The result shows that with addition of plasticizer glass transition temperature (Tg) is decreased sharply and the storage modulus was also decreased.

Plasticizing effect of poly(ethylene glycol)s with different molecular weights in poly(lactic acid)/starch blends

2015 ◽  
Vol 132 (16) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yunan Yu ◽  
Yan Cheng ◽  
Jiawei Ren ◽  
Erping Cao ◽  
Xiaowei Fu ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Ethylene Glycol ◽  
Poly Lactic Acid ◽  
Poly Ethylene Glycol ◽  
Molecular Weights ◽  
Starch Blends ◽  
Poly Ethylene
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