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Abstract:

Surface pressure isotherms and structural and surface dilatational properties of three hydroxypropylmethycelluloses (HPMCs, called E4M, E50LV, and F4M) adsorbed films at the air-water interface were determined. In this work we present evidence that HPMC molecules are able to diffuse and saturate the air-water interface at very low concentrations in the bulk phase. As bulk concentration increased, structural changes at a molecular level occurred at the interface. These changes corresponded to transition from an expanded structure (structure I) to a condensed one (structure II). When the surface concentration of HPMC was high enough, the collapse of the monolayer was observed. The three HPMCs formed very elastic films at the air-water interface, even at low surface pressures. E4M showed features that make it unique. For instance it showed the highest surface activity, mainly at low bulk concentrations (<10-4 wt %). The differences observed in surface activity may be attributed to differences in the hydroxypropyl molar substitution and molecular weight of HPMC. All three HPMCs formed films of similar viscoelasticity and elastic dilatational modulus, which can be accounted for by their similar degree of methyl substitution. © 2006 American Chemical Society.

Registro:

Documento: Artículo
Título:Thermodynamic and dynamic characteristics of hydroxypropylmethylcellulose adsorbed films at the air-water interface
Autor:Pérez, O.E.; Sánchez, C.C.; Rodríguez Patino, J.M.; Pilosof, A.M.R.
Filiación:Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, c/ Professor Garcia Gonzalez 1, 41012-Sevilla, Spain
Palabras clave:Cellulose films; Elastic moduli; Isotherms; Molecular weight; Molecules; Rheology; Thermodynamic properties; Viscoelasticity; Elastic dilatational modulus; Molecular level; Surface pressure isotherms; Cellulose; adsorbent; hydroxypropylmethylcellulose; methyl group; water; air; article; chemical structure; concentration (parameters); controlled study; diffusion; elasticity; film; hypobarism; interface pressure; isotherm; molecular dynamics; molecular weight; phase transition; priority journal; substitution reaction; surface property; thermodynamics; viscoelasticity; Air; Elasticity; Methylcellulose; Phase Transition; Thermodynamics; Water; Cellulose Film; Elastic Strength; Hydroxypropyl Methyl Cellulose; Isotherms; Molecular Weight; Molecules; Rheology; Thermal Properties; Viscoelasticity
Año:2006
Volumen:7
Número:1
Página de inicio:388
Página de fin:393
DOI: http://dx.doi.org/10.1021/bm050757o
Título revista:Biomacromolecules
Título revista abreviado:Biomacromolecules
ISSN:15257797
CODEN:BOMAF
CAS:hydroxypropylmethylcellulose, 9004-65-3; water, 7732-18-5; hypromellose, 8063-82-9; Methylcellulose, 9004-67-5; Water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15257797_v7_n1_p388_Perez

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Citas:

---------- APA ----------
Pérez, O.E., Sánchez, C.C., Rodríguez Patino, J.M. & Pilosof, A.M.R. (2006) . Thermodynamic and dynamic characteristics of hydroxypropylmethylcellulose adsorbed films at the air-water interface. Biomacromolecules, 7(1), 388-393.
http://dx.doi.org/10.1021/bm050757o
---------- CHICAGO ----------
Pérez, O.E., Sánchez, C.C., Rodríguez Patino, J.M., Pilosof, A.M.R. "Thermodynamic and dynamic characteristics of hydroxypropylmethylcellulose adsorbed films at the air-water interface" . Biomacromolecules 7, no. 1 (2006) : 388-393.
http://dx.doi.org/10.1021/bm050757o
---------- MLA ----------
Pérez, O.E., Sánchez, C.C., Rodríguez Patino, J.M., Pilosof, A.M.R. "Thermodynamic and dynamic characteristics of hydroxypropylmethylcellulose adsorbed films at the air-water interface" . Biomacromolecules, vol. 7, no. 1, 2006, pp. 388-393.
http://dx.doi.org/10.1021/bm050757o
---------- VANCOUVER ----------
Pérez, O.E., Sánchez, C.C., Rodríguez Patino, J.M., Pilosof, A.M.R. Thermodynamic and dynamic characteristics of hydroxypropylmethylcellulose adsorbed films at the air-water interface. Biomacromolecules. 2006;7(1):388-393.
http://dx.doi.org/10.1021/bm050757o