Thermoresponsive nanogels with film-forming ability

2018 ◽  
Vol 9 (8) ◽  
pp. 1004-1011 ◽  
Author(s):  
Ana S. Sonzogni ◽  
Mario C. G. Passeggi ◽  
Stefanie Wedepohl ◽  
Marcelo Calderón ◽  
Luis M. Gugliotta ◽  
...  
Keyword(s):  
One Pot ◽  
Film Forming ◽  
Particle Coalescence

A one pot semibatch method was proposed for synthesizing poly(N-vinylcaprolactam)-based nanogels with particle coalescence ability.

scholarly journals Chitosan coated copper-oxide nano particles: a novel electro-catalyst for CO2 reduction

RSC Advances ◽  
2014 ◽  
Vol 4 (109) ◽  
pp. 63685-63690 ◽  
Author(s):  
Srijita Basumallick ◽  
Swadeshmukul Santra
Keyword(s):  
Copper Oxide ◽  
Co2 Reduction ◽  
Nano Particles ◽  
One Pot ◽  
Film Forming

We report here a simple one-pot method for the synthesis of copper-oxide based novel film forming electro catalysts for CO2 reduction.

scholarly journals Non-isocyanate poly(amide-hydroxyurethane)s from sustainable resources

2016 ◽  
Vol 18 (17) ◽  
pp. 4667-4681 ◽  
Author(s):  
Keren Zhang ◽  
Ashley M. Nelson ◽  
Samantha J. Talley ◽  
Mingtao Chen ◽  
Evan Margaretta ◽  
...  
Keyword(s):  
Plant Oil ◽  
One Pot ◽  
Sustainable Resources ◽  
Mechanical Integrity ◽  
Melt Polymerization ◽  
Film Forming

A one-pot melt polymerization of plant oil-based monomers and diamines afforded film-forming, isocyanate-free poly(amide-hydroxyurethane)s with processability and mechanical integrity.

Unexpected self-assembly, photoluminescence behavior, and film-forming properties of polysiloxane-based imidazolium ionic liquids prepared by one-pot thiol–ene reaction

2017 ◽  
Vol 41 (23) ◽  
pp. 14545-14550 ◽  
Author(s):  
Yujing Zuo ◽  
Zhiming Gou ◽  
Zhaoyue Li ◽  
Jinwan Qi ◽  
Shengyu Feng
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Self Assembly ◽  
High Yield ◽  
Imidazolium Ionic Liquid ◽  
One Pot ◽  
Ene Reaction ◽  
Imidazolium Ionic Liquids ◽  
Film Forming ◽  
Photoluminescence Behavior

The synthesis of a series of polysiloxane-based ionic liquids (PNLs) is reported via straightforward thiol–ene reaction with high yield using three kinds of imidazolium ionic liquid monomers.

Effect of Ca2+ Ions on the Film Formation of an Anionic Styrene/n-Butylacrylate Latexpolymer in Cement Pore Solution

2013 ◽  
Vol 687 ◽  
pp. 322-328 ◽  
Author(s):  
Thomas Pavlitschek ◽  
Markus Gretz ◽  
Johann Plank
Keyword(s):  
Pore Solution ◽  
Film Formation ◽  
Water Film ◽  
Particle Packing ◽  
Secondary Phases ◽  
Particle Deformation ◽  
Film Forming ◽  
Forming Temperature ◽  
Particle Coalescence ◽  
Forming Behaviour

Several methods were employed to study the time dependent film formation of a self synthesized anionic latex dispersion in water and cement pore solution. First, a model carboxylated styrene/n-butyl acrylate latex dispersion possessing a minimum film forming temperature (MFFT) of 18 °C and a glass transition temperature (Tg) of 30 °C was synthesized via emulsion polymerization. Next, its film forming behaviour was studied at 40 °C, using an ESEM instrument. The analysis revealed that upon removal of water, film formation occurs as a result of particle packing, particle deformation and finally particle coalescence. Film formation is significantly hindered in synthetic cement pore solution. This effect can be ascribed to adsorption of Ca2+ ions onto the surface of the anionic latex particles and to interfacial secondary phases. This layer of adsorbed Ca2+ ions hinders interdiffusion of the macromolecules and subsequent film formation of the latex polymer.

scholarly journals One-Pot Synthesis of Amide-Functional Main-Chain Polybenzoxazine Precursors

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 679 ◽  
Author(s):  
Canan Durukan ◽  
Baris Kiskan ◽  
Yusuf Yagci
Keyword(s):  
Ring Opening ◽  
Spectroscopic Analysis ◽  
Main Chain ◽  
Ring Closure ◽  
Scanning Calorimetry ◽  
Free Standing ◽  
One Pot ◽  
Flexible Films ◽  
Film Forming ◽  
The One

Main-chain polybenzoxazines containing amide linkages were successfully prepared in one pot. Three different polymers were synthesized by reacting 3,4-dihydrocoumarine (DHC) and paraformaldehyde with 1,3-diaminopropane or 1,6-diaminohexane or Jeffamine ED-900. The one-pot reaction proceeded through the combination of the ring-opening of DHC with amines, and subsequent Mannich and ring-closure reactions occurring in a cascading manner. The obtained polymer from Jeffamine exhibited good film-forming properties, and free-standing flexible films were easily solvent- casted on Teflon plates. All polymeric precursors were characterized by spectroscopic analysis, and their curing behavior and thermal stability were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).

Clean Electron Microscope Substrate Films Used for Micrometeorite Collection and Study

1967 ◽  
Vol 25 ◽  
pp. 366-367
Author(s):  
D. M. Davies ◽  
R. Kemner ◽  
E. F. Fullam
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
High Altitude ◽  
Amyl Acetate ◽  
Temperature Variations ◽  
Film Forming ◽  
Film Specimen ◽  
Particulate Contaminants

All serious electron microscopists at one time or another have been concerned with the cleanliness and freedom from artifacts of thin film specimen support substrates. This is particularly important where there are relatively few particles of a sample to be found for study, as in the case of micrometeorite collections. For the deposition of such celestial garbage through the use of balloons, rockets, and aircraft, the thin film substrates must have not only all the attributes necessary for use in the electron microscope, but also be able to withstand rather wide temperature variations at high altitude, vibration and shock inherent in the collection vehicle's operation and occasionally an unscheduled violent landing.Nitrocellulose has been selected as a film forming material that meets these requirements yet lends itself to a relatively simple clean-up procedure to remove particulate contaminants. A 1% nitrocellulose solution is prepared by dissolving “Parlodion” in redistilled amyl acetate from which all moisture has been removed.

A Freeze Shadow Technique for the Preparation of Soft Paint Latexes for Electron Microscopy

1977 ◽  
Vol 35 ◽  
pp. 314-315
Author(s):  
Earl R. Walter ◽  
Glen H. Bryant
Keyword(s):  
Sample Preparation ◽  
High Vacuum ◽  
Vacuum System ◽  
Latex Particles ◽  
New Methods ◽  
Diffusion Pump ◽  
Film Forming ◽  
Routine Basis ◽  
Distribution Studies ◽  
Preparation Techniques

With the development of soft, film forming latexes for use in paints and other coatings applications, it became desirable to develop new methods of sample preparation for latex particle size distribution studies with the electron microscope. Conventional latex sample preparation techniques were inadequate due to the pronounced tendency of these new soft latex particles to distort, flatten and fuse on the substrate when they dried. In order to avoid these complications and obtain electron micrographs of undistorted latex particles of soft resins, a freeze-dry, cold shadowing technique was developed. The method has now been used in our laboratory on a routine basis for several years.The cold shadowing is done in a specially constructed vacuum system, having a conventional mechanical fore pump and oil diffusion pump supplying vacuum. The system incorporates bellows type high vacuum valves to permit a prepump cycle and opening of the shadowing chamber without shutting down the oil diffusion pump. A baffeled sorption trap isolates the shadowing chamber from the pumps.

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