title: Fourier-transform rheology of polymer Langmuir monolayers: analysis of the non-linear and plastic behaviors.
abstract: The linear regime (LR) of viscoelastic behavior has been found to be limited to rather small values of strain, well below the strains found in many technological processes. A Fourier-transform method is described for analyzing the surface rheology data obtained in insoluble Langmuir polymer monolayers beyond the LR. In the concentrate regime, the monolayers show a transition from elastic to plastic behavior, which is characterized by high irreversibility. A simple 2-D rubber model is presented that describes the behavior of the monolayers in the non-linear region not too far from the end of the LR.
authors.affiliation: Dept. Química Física I, Fac. Química, Univ. Complutense, 28040-Madrid, Spain.
authors.forename: Hani
authors.initials: H
authors.lastname: Hilles
authors.forename: Francisco
authors.initials: F
authors.lastname: Monroy
authors.forename: Laura J
authors.initials: LJ
authors.lastname: Bonales
authors.forename: Francisco
authors.initials: F
authors.lastname: Ortega
authors.forename: Ramón G
authors.initials: RG
authors.lastname: Rubio
mesh_terms: D004548:Elasticity; D005583:Fourier Analysis; D015233:Models, Statistical; D008962:Models, Theoretical; D009991:Oscillometry / Q000379:methods*; D010969:Plastics / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D012212:Rheology / Q000379:methods*; D012408:Rubber; D013499:Surface Properties; D013696:Temperature
chemical_list: D010969:Plastics; D011108:Polymers; D011145:Polyvinyls; C013215:polyvinyl acetate; D012408:Rubber