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- W2065201436 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." @default.
- W2065201436 created "2016-06-24" @default.
- W2065201436 creator A5048714768 @default.
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- W2065201436 date "2005-12-09" @default.
- W2065201436 modified "2023-09-30" @default.
- W2065201436 title "Thermodynamic and Dynamic Characteristics of Hydroxypropylmethylcellulose Adsorbed Films at the Air−Water Interface" @default.
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- W2065201436 doi "https://doi.org/10.1021/bm050757o" @default.
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