6533b821fe1ef96bd127c2fa
RESEARCH PRODUCT
Interpolymer complex between hydroxypropyl cellulose and maleic acid-styrene copolymer: phase behavior of semi-dilute solutions.
Bernhard A. WolfJohn EckeltCornelia VasileGina-gabriela Bumbusubject
Materials sciencePolymers and PlasticsMaleic acidBioengineeringStyreneBiomaterialschemistry.chemical_compoundNephelometry and TurbidimetryPhase (matter)Polymer chemistrySpectroscopy Fourier Transform InfraredMaterials ChemistryCopolymerCellulosechemistry.chemical_classificationCloud pointTernary numeral systemMolecular StructureHydroxypropyl celluloseMaleatesTemperatureWaterPolymerSolutionschemistryChemical engineeringPolystyrenesRheologyBiotechnologydescription
Summary: 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 ( = 50 s−1) the phase separation temperature of the system is 10–15 °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. The phase separation temperature of HPC/MAc-S aqueous mixtures versus the weight fraction of the HPC in the blend.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-10-20 | Macromolecular bioscience |