Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 62 for “"Vinyl alcohol"”.
-
Microrheology and microstructure of poly(vinyl alcohol)-based physical gels
… microstructure of physically cross-linked poly(vinyl alcohol) (PVA) gels using atomic force microscopy, dynamic light scattering and particle tracking. We compare the microscopic rheological properties with the bulk properties measured using conventional shear rheometry, and correlate the …
-
The blending of hydroxypropyl lignin with poly(methylmethacrylate) and poly(vinyl alcohol)
… poly(methyl methacrylate) (PMMA ) and poly(vinyl alcohol) (PVA) were evaluated in terms of their morphology, viscoelastic properties and mechanical properties. In the case of HPL/PMMA blends experimental variables included HPL molecular weight, HPL content and method of preparation. Methods …
-
Preparation and characterisation of poly(ethylene terephthalate) and poly(vinyl alcohol)/clay nanocomposites.
… (PET)/organo-montmorillonite and poly (vinyl alcohol)(PVOH)/ montmorillonite nanocomposites and the diffusion behaviour of water and acetone/water mixtures into the latter have been investigated. Nanocomposites of PET and various, commercially available, organoclays have been prepared by …
-
Synthetic crosslinking of poly(vinyl alcohol) for use in a synthetic articular cartilage,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1972.
-
Hydrogen-bonded layer-by-layer assembly of poly(vinyl alcohol) and tannic acid
… thin films containing tannic acid (TA) and poly(vinyl alcohol) (PVA) were assembled under different pH conditions, and film growth and dissolution behavior was assessed through profilometry. Optimal film growth was achieved at pH 4.0, which contrasted with uncontrollable assembly at lower pH and …
-
Use of poly vinyl alcohol (PVA) cryogelation for tissue engineering: composites, scaffold formation and cell encapsulation
PVA cryogelation is a physical hydrogel formation method, which yields cryogels with comparable mechanical properties to vascular tissue. However PVA cryogels are not suitable for cell attachment and proliferation alone. This can be overcome by the development of composite cryogels. Moreover, …
-
Crystalline radiation-crosslinked hydrogels of poly(vinyl-alcohol) as potential biomaterials: a study of the properties of poly(vinyl-alcohol) hydrogels in relation to conditions of primary crosslinking by irradiation, and of secondary network reinforcement by crystallization,
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1974.
-
Compressive Mechanics Of A Poly (Vinyl Alcohol)-Based Hydrogel System For The Replacement Of The Knee Meniscus
… image of the native meniscus. Blends of poly (vinyl alcohol) PVA and poly (vinyl pyrrolidone) (PVP) present a potential solution. PVA has shown similar characteristics to soft tissues. PVP further stabilizes the hydrogel network. This work is the mechanical characterization of PVA/PVP (99:1) …
-
Compositional Effects on the Chemorheological Properties and Forming Behavior of Aqueous Alumina-Poly(vinyl Alcohol) Gelcasting Suspensions
Gelcasting suspensions were used as feedstock for solid free-form fabrication (SFF) of ceramic components. The influence of processing conditions (e.g., tip diameter, mixing rate, table speed, etc.) and suspension rheology on deposition behavior was investigated. Continuous printablity was achieved …
-
Poly(vinyl alcohol) based hydrogen-bonded multilayers : from pH-controlled multi-stage dissolution to zwitter-wettable surfaces
… a novel systematic framework in which poly(vinyl alcohol) (PVA) can be incorporated into LbL assembled multilayer thin films. Incorporation of PVA into multilayer thin films is advantageous due to its biocompatibility and ease of chemical functionalization and cross-linking. The optimal …
-
Preparation and characterisation of poly (vinyl alcohol)/chitosan/silicon dioxide (PVA/CS/SiO2) beads for the chromium (VI) (Cr(VI) removal
… blend polymer absorbent beads which was poly (vinyl alcohol)/chitosan/silicon dioxide (PVA/CS/SiO2) beads were prepared by dropwise method by crosslinking with sodium hydroxide and ethanol and further crosslinked with glutraldehyde for the purpose of Cr(VI) ion removal in aqueous solution under …
-
Influence of processing on the structure and properties of semi-crystalline polymer systems : 1) biodegradable starch/poly(ethylene-vinyl alcohol) blends and 2) polyolefinic thermoplastics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
-
Energy Transfer Among Fluorescent Molecules Dispersed in Thin Films of Polymer or Protein (Rhodamine B, Sulforhodamine 101, Polyvinyl, Poly (Vinyl Alcohol) Bovine Serum Albumin, Time-Correlated Photon Counting, Lifetimes)
… a system of RHB molecules dispersed in poly(vinyl alcohol) (PVOH) can collect light energy and transfer the energy of the excited state, or exciton, among the RHB molecules and to trap sites. Such a system could be technologically useful if it can improve the effectiveness of proposed …
-
Temperature and Water Responsive Shape Memory Polymers for Soft Tissue Expansion
… The bottlebrush polymer with Poly (vinyl alcohol) backbone and polyurethane side chains exhibited shape memory effect. Using an environmentally friendly microwave assisted synthesis technique, Poly (vinyl alcohol)-graft-Poly(ε-caprolactone) was synthesized. Subsequently, the free …
-
Processing-property characteristics of a polymer-cement composite
… of hardened calcium aluminate cement-poly(vinyl) alcohol (CAC-PVA) composites. Effects of cement particle size and polymer molecular weight were also investigated.
-
Accessing Model, Functional Polyolefins and Polyolefin Copolymers with Ring-Opening Metathesis Polymerization
… synthesis of a gas barrier polymer, an ethylene vinyl alcohol (EVOH) copolymer, made by ROMP of 3-functional cyclooctene. Chapter 3 explores the effect of regioregularity, given by ROMP of cyclooctenes with substituents in the 3 position, on the barrier properties of EVOH with the goal of …
-
Towards a carbon nanotube antibody sensor
… strains. Protein A itself, dextran, poly vinyl alcohol, DNA sequences, and chitosan were used as polymers for wrapping SWNT. Nonspecific binding to solution-phase constructs was found to be a major problem with these approaches. Chitosan hydrogels encapsulating SWNT also show nonspecific …
-
Development and application of novel capillary electrophoresis techniques for analysis of DNA fragments and organic pollutants
… sample stacking procedure in a poly(vinyl alcohol)-coated capillary, and an improved offline cationic surfactant-assisted solid-phase extraction method were developed for sensitive analysis of herbicides. Besides, simultaneous analysis of 2 groups of acidic pollutants in environmental …
-
Preparação e caracterização de blendas formadas por goma xantana e poli (alcóol vinílico) para aplicação na área de liberação controlada de fármacos.
… of polymeric films xanthan ( GX ) and poly ( vinyl alcohol ) ( PVA ) chemically crosslinked with citric acid (CA ) for further application in controlled release of drugs . Infrared analysis showed possible interactions between the polymers in the blend and the incorporation of crosslinker into …
Page 1 of 4