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Interpolymer Complex between Hydroxypropyl Cellulose and Maleic Acid–Styrene Copolymer: Phase Behavior of Semi‐Dilute Solutions
Author(s) -
Bumbu GinaGabriela,
Eckelt John,
Wolf Bernhard A.,
Vasile Cornelia
Publication year - 2005
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200500070
Subject(s) - polymer chemistry , copolymer , aqueous solution , polymer , styrene , phase (matter) , maleic acid , lower critical solution temperature , hydroxypropyl cellulose , chemistry , chemical engineering , polymer blend , materials science , analytical chemistry (journal) , organic chemistry , engineering
Summary: The phase behavior of a water/hydroxypropyl cellulose/maleic acid–styrene copolymer (H 2 O/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 c pol = 5 mg · mL −1 a second phase segregates upon heating the homogeneous ternary system. By applying a constant shear rate ( $\dot \gamma$ = 50 s −1 ) the phase separation temperature of the system is 10–15 °C lower than for an unsheared one. For c pol = 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 c pol .The phase separation temperature of HPC/MAc‐S aqueous mixtures versus the weight fraction of the HPC in the blend.