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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 96 for “"cellulose acetate"”.
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The solubility of cellulose acetate fractions
no abstract provided by author
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Preparation of cellulose acetate with acetic acid
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1936.
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Dielectric dispersion in dilute cellulose acetate solutions
… (1) was carried out on solutions to cellulose acetate in dioxane. It was found that the change in dielectric constant was so small that rather concentrated solutions had to be used in order to obtain reproducible results. The possibility of intermolecular interactions in concentrated …
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Characterization of polyethylene terephthalate, cellulose acetate and their blends
… of polyethylene terephthalate (PET), cellulose acetate (CA) and their blend. Dynamic Contact Angle (DCA) measurements are performed to obtain the surface free energies of PET and CA so that they can be compared to that from IGC. Moreover, the DCA data are used to calculate their …
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A treatment feasibility study of a cellulose acetate manufacturing wastewater
… of soluble organic material resulting from a cellulose acetate manufacturing process. Both physical-chemical and biological treatment processes were applied to the wastewater to determine whether the performance of the physical-chemical approaches would be less than, equal to, or greater than …
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Development of Co-processed Plasticized Cellulose Acetate for Sustained Release Matrix Tablets
<p>Cellulose Acetate (CA) is a polymer extensively used in pharmaceutical applications. Because of the hydrophobic nature and good film properties of CA, it is a good polymer candidate for sustained release matrix tablets. Sustained release matrix tablets of cellulose acetate can be prepared by …
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Effect of degree of acetylation on mechanical properties of cellulose acetate films
Four samples of cellulose acetates having degrees of combined acetic acid between 50.8 - 55.8% were fractionated to obtain sharp fractions or approximately the same degree of polymerization. About 2000 grams starting material of each sample of cellulose acetate were needed to obtain approximately …
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Investigation of biological phosphorus removal for the treatment of a cellulose acetate manufacturing wastewater
The use of a two Stage Biological Phosphorus Removal (BPR) system to treat a high strength, low pH industrial wastewater was evaluated. A laboratory scale BPR system was continuously operated and fed the industrial wastewater. Effective utilization or removal of carbonaceous material as measured by …
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An investigation of the factors affecting the degradation of cellulose acetate artefacts in museum collections
… Current interest concerns the degradation of cellulose acetate artefacts; the work carried out and reported here examines this problem by studying artefacts of various ages and degrees of degradation using accelerated ageing and comparing these results to those for naturally aged samples. …
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The effect of fixed film pretreatment on activated sludge stability during the treatment of cellulose acetate wastewater
… (AS) process used for treating high-strength cellulose acetate wastewater of Celanese Corporation, Pearisburg, Virginia, produces a sludge with poor flocculation and settling characteristics, particularly during the periods of shock organic loadings. Pilot-scale treatment units were set up to …
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Effect of copper and nickel on the performance of an activated sludge system treating cellulose acetate wastewater
… activated sludge process at the Hoechst Celanese cellulose acetate manufacturing plant, located at Narrows, Virginia. The influent wastewater to the experimental unit was pretreated with lime and then selected amounts of copper and nickel were added separately or together to evaluate their effects …
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Biphasic Cellulose Acetate/Rtil Membranes And Functionalized Graphene Adsorbents For Natural Gas Processing: Experimental And Molecular Simulation Studies
… pressure. For this purpose, single and biphasic cellulose acetate (ca)/[emim][scn] membranes were fabricated using the solution casting and solution casting/phase inversion methods, respectively. Infrared spectra and atomic force micrographs were generated to characterize the fabricated …
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An investigation of the effects of the addition of powdered activated carbon to the activated sludge of cellulose acetate manufacturing wastewater
… 280 mg/L in activated sludge reactors treating cellulose acetate manufacturing wastewater were found to enhance substrate removal. The improved substrate removal as measured by COD averaged 20 percent. The apparent mechanism of improved removal was the stimulation of greater biomass growth. PAC …
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Adsorption of Blood Proteins onto Polysaccharide Surfaces
… hemodialysis membrane applications: regenerated cellulose and cellulose acetate. The study aims to provide insight into the design of novel hemocompatible polysaccharide materials. Information such as real-time adsorption curves, adsorbed amounts, and water contents of the protein layers were …
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Effect of network structure on lignin-derived polyurethane film properties
… Fracture surface analysis of model substrates (cellulose acetate and cellulose tri-acetate) bonded with a lignin-polyisocyanate resin by Electron Spectroscopy for Chemical Analysis (ESCA) revealed the formation of interfacial bonds on the surface of the cellulose acetate adherend. Furthermore, …
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Synthesis and Characterization of Drug-Containing, Polysaccharide-Based Nanoparticles for Applications in Oral Drug Delivery
… were investigated. In this thesis, several novel cellulose derivatives and a pullulan derivative were studied. Among these polymers, carboxymethyl cellulose acetate butyrate (CMCAB)-drug nanoparticles were investigated in detail. Previous work has shown that the presence of different chemical …
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Design and Synthesis of Complex and Fluorescent Labeled Cellulose-Based Derivatives for Orally Administered Drug Delivery Systems
Cellulose ethers are valuable matrices for drug-delivery systems (DDS), namely amorphous solid dispersions (ASD). ASD are efficient vehicles that can solubilize and stabilize poorly soluble drugs by increasing the time that it takes for drugs to crystallize, thereby allowing higher drug …
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Regioselective Synthesis of Glycosaminoglycan Analogs
… biological roles and biosynthesis modulation. Cellulose is an abundant and renewable natural polymer. Applications of cellulose and cellulose derivatives have drawn increasing attention in recent decades. Chemical modification is an efficient method to append new functionalities to the …
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