title: Interpolymer complex between hydroxypropyl cellulose and maleic acid-styrene copolymer: phase behavior of semi-dilute solutions.
abstract: The phase behavior of a water/hydroxypropyl cellulose/maleic acid-styrene copolymer (H2O/HPC/MAc-S) system was investigated in the semi-dilute range by turbidimetry, rheology, and optical microscopy. The two polymers under investigation form interpolymer complexes via hydrogen bonding. In the case of a total polymer concentration of cpol = 5 mg . mL(-1) a second phase segregates upon heating the homogeneous ternary system. By applying a constant shear rate (gamma = 50 s(-1)) the phase separation temperature of the system is 10-15 degrees C lower than for an unsheared one. For cpol = 10 mg . mL(-1) phase separation has already occurred at room temperature when the two binary polymer solutions are mixed. The distribution of the partners among the coexisting phases was examined by FT-IR spectroscopy. The stoichiometry of the interpolymeric complex (IPC) was estimated to be HPC/MAc-S = 40:60 (w/w) independent of cpol.
authors.affiliation: University of Mainz, Institute of Physical Chemistry, Jakob Welder Weg 13, 55099 Mainz, Germany. bmgg@pc-ak-wolf.chemie.uni-mainz.de
authors.forename: Gina-Gabriela
authors.initials: GG
authors.lastname: Bumbu
authors.forename: John
authors.initials: J
authors.lastname: Eckelt
authors.forename: Bernhard A
authors.initials: BA
authors.lastname: Wolf
authors.forename: Cornelia
authors.initials: C
authors.lastname: Vasile
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D008298:Maleates / Q000737:chemistry*; D015394:Molecular Structure; D009391:Nephelometry and Turbidimetry; D011137:Polystyrenes / Q000737:chemistry*; D012212:Rheology; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D008298:Maleates; D011137:Polystyrenes; D012996:Solutions; D014867:Water; C024075:styrofoam; D002482:Cellulose; C030272:maleic acid; C008079:hydroxypropylcellulose