Film Formation of Acrylic Latices with Varying Concentrations of Non-Film-Forming Latex Particles

Langmuir ◽  
1996 ◽  
Vol 12 (16) ◽  
pp. 3793-3801 ◽  
Author(s):  
Joseph L. Keddie ◽  
Paul Meredith ◽  
Richard A. L. Jones ◽  
Athene M. Donald
Keyword(s):  
Film Formation ◽  
Latex Particles ◽  
Film Forming

Film Formation of a Non-Ionic Ethylene-Vinyl Acetate Latex Dispersion in Cement Pore Solution

2013 ◽  
Vol 687 ◽  
pp. 316-321 ◽  
Author(s):  
Thomas Pavlitschek ◽  
Yu Jin ◽  
Johann Plank
Keyword(s):  
Vinyl Acetate ◽  
Pore Solution ◽  
Film Formation ◽  
Environmental Scanning Electron Microscopy ◽  
Ethylene Vinyl Acetate ◽  
Particle Packing ◽  
Particle Deformation ◽  
High Concentration ◽  
Latex Particles ◽  
Film Forming

Environmental scanning electron microscopy (ESEM) and complementary methods were employed to study the time dependent film formation of a non-ionic latex dispersion in water @ pH 12.8 and cement pore solution. A commercial liquid ethylene-vinyl acetate latex dispersion stabilized with PVOH possessing a minimum film forming temperature (MFFT) of 3 °C and a Tg of 19 °C was employed in the study. Prior to ESEM imaging the latex dispersion was stored at room temperature and then transferred into the ESEM instrument for imaging. Subsequently, micrographs monitoring its film forming behaviour are obtained. The analysis revealed that upon removal of water, film formation occurs as a result of particle packing, particle deformation and finally particle coalescence. In synthetic cement pore solution film formation occurs faster than in water and is complete within one day. This acceleration can be ascribed to the presence of PVOH on the surface of the latex particles. In water at neutral pH, PVOH forms a shell around the latex particle and hinders the interdiffusion of the macromolecules while in cement pore solution, PVOH precipitates due to high pH and high concentration of cations. This way the latex particles can coalesce faster into a polymer film.

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.

Effects of monomer feed methods in emulsion polymerizations and hydrophilicity of monomers on morphology of latex particles and their minimum film formation temperatures

1993 ◽  
Vol 32 (2) ◽  
pp. 153-158 ◽  
Author(s):  
Tongyu Cao ◽  
Yongshen Xu ◽  
Yanjun Wang ◽  
Xuesun Chen ◽  
Aiqin Zheng
Keyword(s):  
Film Formation ◽  
Latex Particles ◽  
Monomer Feed ◽  
Emulsion Polymerizations

High PVC film-forming composite latex particles via miniemulsification, part 3: Optical properties

2006 ◽  
Vol 101 (6) ◽  
pp. 4526-4537 ◽  
Author(s):  
Ghurmallah H. Al-Ghamdi ◽  
E. David Sudol ◽  
Victoria L. Dimonie ◽  
Mohamed S. El-Aasser
Keyword(s):  
Optical Properties ◽  
Latex Particles ◽  
Film Forming ◽  
Pvc Film

Effect of molecular weight distribution on polymer diffusion during film formation of two-component high-/low-molecular weight latex particles

Polymer ◽  
2012 ◽  
Vol 53 (13) ◽  
pp. 2652-2663 ◽  
Author(s):  
Mohsen Soleimani ◽  
Sheraz Khan ◽  
David Mendenhall ◽  
Willie Lau ◽  
Mitchell A. Winnik
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Film Formation ◽  
Low Molecular Weight ◽  
Polymer Diffusion ◽  
Latex Particles ◽  
Two Component

scholarly journals The Influence of Deproteinisation in the Morphology of Natural Rubber Latex Particles and Subsequent Film Formation

2015 ◽  
Vol 16 ◽  
pp. 31-38 ◽  
Author(s):  
M.Y. Norhanifah ◽  
A. Nurulhuda ◽  
M. Asrul
Keyword(s):  
Natural Rubber ◽  
Film Formation ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Latex Particles

scholarly journals Film forming PVA-based cleaning systems for the removal of corrosion products from historical bronzes

2018 ◽  
Vol 90 (3) ◽  
pp. 507-522 ◽  
Author(s):  
Erica I. Parisi ◽  
Nicole Bonelli ◽  
Emiliano Carretti ◽  
Rodorico Giorgi ◽  
Gabriel M. Ingo ◽  
...  
Keyword(s):  
Film Formation ◽  
Poly Vinyl Alcohol ◽  
Complexing Agent ◽  
Film Forming ◽  
Innovative System ◽  
Mechanical Procedure ◽  
Cleaning Procedures ◽  
Film Formation Mechanism

AbstractThis paper presents an innovative poly(vinyl)alcohol-based film forming system, specifically devised for the controllable and selective cleaning of copper-based artifacts. Traditional cleaning procedures are commonly performed using mechanical and/or chemical methods. Unfortunately, both these methods present some limitations related to both the poor selectivity and invasiveness in case of the mechanical procedure, and to the scarce control over the involved reactions when dealing with a chemical approach. The innovative system proposed in this work allows combining the advantages of chemical and mechanical treatments thanks to the confinement of a complexing agent (EDTA) within a fluid, polymeric matrix, that is able to form a solid thin film upon drying. After treatment, the polymeric film can be completely removed from the artwork through a gentle peeling action. In this contribution, the film formation mechanism was investigated by means of thermal analysis and rheology; the role of plasticizers, volatile solvent fraction, and quantity of loaded EDTA is also discussed. Finally, the results of cleaning tests performed on artificially aged samples, and on a real case study, the “Fontana dei Mostri Marini” by Pietro Tacca in Florence, are presented.

Development of Mucoadhesive Film-Forming Systems Containing Black Ginger Extract for Aphthous Ulcers

2021 ◽  
Vol 901 ◽  
pp. 104-110
Author(s):  
Nattanich Wattanaphraya ◽  
Somkamol Manchun ◽  
Siriporn Taokaew ◽  
Worawut Kriangkrai
Keyword(s):  
Film Formation ◽  
Aphthous Ulcer ◽  
Alternative Formulation ◽  
Ginger Extract ◽  
Inflammatory Agent ◽  
Mucoadhesive Polymers ◽  
Aphthous Ulcers ◽  
Film Forming ◽  
Gradual Release

Film-forming systems (FFSs) were developed by using Eudragit® E100 as a film former. Kaempferia parviflora (black ginger) extract was used as an anti-inflammatory agent for aphthous ulcers. The FFS could rapidly form a thin film in only 5 s when it was applied to a wet surface e.g. an aphthous ulcer. When the FFS was applied to a dry surface, the FFS without extract could form a film in 2-4 min. The incorporation of this extract contributed to delaying the film-formation time in the dry state; hence, the film-forming time increased to 6-8 min. The mucoadhesive property of FFSs was verified with the wash-off method. To simulate oromucosal conditions, the FFSs were applied on a cellophane membrane coated with mucin and washed by phosphate buffer of pH 6.8. The formulations without mucoadhesive polymers could not withstand flushing with a medium for more than 8 min without dislodging. Therefore, three different mucoadhesive agents were trialed: PVP K90, HPMC E15 LV, and HPC SL. The highest adhesion results were obtained when HPMC was added at 5%(w/w) as well as, the residence time was 22 min. In vitro release of black ginger extract from FFS showed a gradual release for 2 h. This study indicated that the FFS with HPMC E15 LV was an appropriate alternative formulation as a local delivery system for an aphthous ulcer.

Effect of annealing rate on film formation from poly(vinyl acetate) latex particles

2008 ◽  
Vol 15 (1) ◽  
pp. 19-33 ◽  
Author(s):  
Ertan Arda ◽  
Selim Kara ◽  
Önder Pekcan
Keyword(s):  
Vinyl Acetate ◽  
Film Formation ◽  
Latex Particles ◽  
Annealing Rate
Sign in / Sign up

Export Citation Format

Share Document