Effect of Cationic Polyelectrolyte on the Flow Behavior of Hydroxypropyl Methyl Cellulose/Polyacrylic Acid Interpolymer Complexes

Abstract

Association of polyacrylic acids and nonionic polymers in solutions via hydrogen bonding results in formation of novel polymeric materials. These complexes are novel individual compounds and their properties are entirely different from the properties of their component polymers. In this study, the effects of a cationic polyelectrolyte (polyethylenimine, PEI) on the interpolymer complexation of hydroxypropyl methyl cellulose (HPMC) with polyarcylic acid (PAA) in aqueous media were studied. Results showed that at low pH, interpolymer complex (IPC) formation was observed betweenHPMC and PAA at a 3:0.5 polymer ratio. Under basic conditions, the viscosity of the IPC increased accompanied with the transition from coiled structure to an extended conformation of associates. Addition of PEI to the same system caused some structural changes in the polymer solution mixtures depending on the pH of the system. PEI worked as a destructive agent for the HPMC/PAA interpolymer complexes and associates. This behavior was attributed to the complex formation between PEI and HPMC via hydrogen bonding.

On the Effects of UV Radiation on the Release Ability of Glucose Embedded in Hydroxypropyl Cellulose Films

“…This aspect may be explained if one considers the formation of hydrogen bonds between HPC and glucose, a phenomenon widely observed for sugars. [10,23] When both S1 and S2 are irradiated, the surface polarity of the samples increased with augmentation of the UV Table 3. The surface tension components and interfacial tension with water (in mN/m) of HPC/glucose films before and after UV exposure at different periods of time t UV (in minutes).…”

“…The DG w values (Fig. 3) were obtained from equation (4) [23] by using the total surface tension of water as 72.8 mN/m [22] and the contact angle of water for the HPC/glucose films from Table 2.…”