Biomaterial Database

Monolayer and Brewster angle microscopy studies of poly(methyl methacrylate)-monopalmitin mixed systems at the air-water interface. 2010

Mercedes Miñones Conde, and J M Trillo, and Olga Conde, and Jose Miñones

Department of Optometry, School of Optics and Optometry, University of Santiago de Compostela, Campus Sur., 15706-Santiago de Compostela, Spain.

Mixed monolayers of poly(methyl metacrylate) (PMMA) and monopalmitin (Mp) were used for the study of their interactions. A thorough analysis of surface pressure (pi)-area (A) isotherms with the Langmuir monolayer technique, complemented with Brewster angle microscopy (BAM) images was performed. Mixed films show two phase transitions at a surface pressure of 14.5 mN/m and at 20-21 mN/m, respectively. Moreover, mixed monolayers show two well-defined collapses: one, corresponding to the lipid (at surface pressures of 50-51 mN/m) and the another one, ascribed to the PMMA, at surface pressure values of 57-58 mN/m. When the mean molecular areas of the mixed films (A(1,2)) were plotted versus film composition (X(1) or X(2)), positive deviations from the ideal behavior were observed at surface pressures below 15 mN/m, which were mainly attributed to a change in the conformation of the PMMA molecules at the surface. However, at higher surface pressures, the areas per monomer unit of the mixed monolayers obey the additivity rule, attributed to the fact that the film components form an immiscible system in these conditions.

UI	MeSH Term	Description	Entries
D008853	Microscopy	The use of instrumentation and techniques for visualizing material and details that cannot be seen by the unaided eye. It is usually done by enlarging images, transmitted by light or electron beams, with optical or magnetic lenses that magnify the entire image field. With scanning microscopy, images are generated by collecting output from the specimen in a point-by-point fashion, on a magnified scale, as it is scanned by a narrow beam of light or electrons, a laser, a conductive probe, or a topographical probe.	Compound Microscopy,Hand-Held Microscopy,Light Microscopy,Optical Microscopy,Simple Microscopy,Hand Held Microscopy,Microscopy, Compound,Microscopy, Hand-Held,Microscopy, Light,Microscopy, Optical,Microscopy, Simple
D010316	Particle Size	Relating to the size of solids.	Particle Sizes,Size, Particle,Sizes, Particle
D005989	Glycerides	GLYCEROL esterified with FATTY ACIDS.	Acylglycerol,Acylglycerols
D000388	Air	The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
D013499	Surface Properties	Characteristics or attributes of the outer boundaries of objects, including molecules.	Properties, Surface,Property, Surface,Surface Property
D013997	Time Factors	Elements of limited time intervals, contributing to particular results or situations.	Time Series,Factor, Time,Time Factor
D014867	Water	A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Hydrogen Oxide
D019904	Polymethyl Methacrylate	Polymerized methyl methacrylate monomers which are used as sheets, moulding, extrusion powders, surface coating resins, emulsion polymers, fibers, inks, and films (From International Labor Organization, 1983). This material is also used in tooth implants, bone cements, and hard corneal contact lenses.	PMMA,Polymethylmethacrylate,Acron,Acrylic Bone Cement,CMW Bone Cement,Implast,Kallocryl K,Lucite,Methyl Acrylic Plastic,Palacos R,Palavit,Perspex,Plexiglas,Plexiglass,Poly(methyl methacrylate),Polymethyl Methacrylate, Isostatic,Polymethyl Methacrylate, Simplex Opaque,Polymethyl Methacrylate, Surgical Simplex Bone Cement, Ammonium Salt,Polymethyl Methacrylate, Surgical Simplex P,Polymethyl Methacrylate, Syndiostatic,Polymethylmetacrylate,Sol,Superacryl,Isostatic Polymethyl Methacrylate,Methacrylate, Polymethyl,Methacrylate, Syndiostatic Polymethyl,Syndiostatic Polymethyl Methacrylate