Short, natural fibers belonging to the species Hildegardia populifolia were reinforced in styrenated polyester matrix. The mechanical properties of these polymer composites such as tensile modulus, compression strength at first deformation, flexural modulus, and izod impact strength were determined. The effect of alkaline treatment of the natural fiber on the mechanical properties of the composites has been reported. The fractured surfaces of these composites were investigated by scanning electron microscopic technique (SEM) to investigate the interfacial bonding between matrix and the reinforcement. The present work has been carried out in order to make partially biodegradable and eco-friendly composites.
A series of polyvinyl alcohol (PVA)-hydroxy propyl methyl cellulose (HPMC) based films and gelrite (gellan gum) based in situ gels were formulated with ciprofloxacin hydrochloride as the drug. Drug diffusion studies were carried out for both the film and in situ gel formulations. The prepared PVA/HPMC blends have been characterized for tensile strength behavior and percent elongation at break. Fourier transfer infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) studies were carried out to study the compatibility of the drug and polymers used. Drug diffusion results indicate that the film and gel formulations containing ciprofloxacin were compatible and showed a prolonged drug release pattern. The gelrite formulation was non-irritant and had a good gelling property compared to PVA/HPMC blends.
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