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Showing 1 to 20 of 53 for “"Melt Processing"”.
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Polymer-organoclay nanocomposites by melt processing
… and several organoclays were prepared by melt processing. A detailed characterization of the thermal degradation of several commercial and experimental organoclays often used to form polymer nanocomposites was reported. The surfactant type, loading, and purification level of organoclay …
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Microporous polymeric membranes via melt processing
… from immiscible polymer blends were produced via melt processing and post-extrusion treatments. Polystyrene (PS)/polypropylene (PP) and poly(ethylene terephthalate) (PET)/polypropylene (PP) blend systems with different rheological properties were studied. The blends were first compounded in an …
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Melt processing of Thallium-based high Tc superconductors
Includes bibliographical references.
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Melt Processing of Metastable Acrylic Copolymer Carbon Precursors
… of engineering technologies that facilitate melt spinning of carbon fiber precursors in both an environmentally sound and cost effective manner. More specifically, methods were developed to avoid a degradative process in acrylonitrile copolymers (typically used in textiles and as carbon fiber …
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Oxidation and stabilisation chemistry of metallocene-based polyolefins during melt processing
… of the oxidation mechanism of m-LLDPE during melt processing in order to develop more effective stabilisation systems and continue to increase the performance of the material. The primary objectives of this work were, firstly, to investigate the oxidative degradation mechanisms of m-LLDPE …
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Melt Processing Thermally Unstable and High Molecular Weight Polymers with Supercritical Carbon Dioxide
… concerned with the development of a continuous melt extrusion process utilizing CO₂ for the production of materials that cannot be typically melt processed. The first goal of this study is to determine under what conditions it is possible to use CO₂ to plasticize and, thereby, reduce the …
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Rheological Considerations for Dual-Extrusion Melt Processing of Dissimilar Polymers in Composite Structures
… used to overcome a wide gap between the maximum processing temperature of the UHMW resin and the minimum processing temperature of the substrate resin and to avoid the high melt viscosity of the UHMW resin, but requires the costly recovery of toxic solvents. The UHMW resin is used because it …
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Advanced Thermoplastic Nanocomposite Melt Processing Using an Improved Supercritical Carbon Dioxide Pretreatment for the Nanomaterial
… use of supercritical carbon dioxide (scCO2) with melt compounding have been investigated to overcome these issues. The focus of this work is on developing the scCO2 treatment of nanomaterial for thermoplastic nanocomposite generation. First, the supercritical carbon dioxide aided melt blending …
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Copolymerizing Acrylonitrile and Methyl Acrylate by RAFT for Melt Processing Applications: A Synthetic Investigation of the Effects of Chain Transfer Agent, Initiator, Temperature, and Solvent
Statistical copolymers of acrylonitrile (AN) and methyl acrylate (MA) were successfully prepared and characterized using reversible addition-fragmentation chain transfer (RAFT) copolymerization. A typical copolymer was charged with 15 wt. % MA content. This thesis describes a systematic variation …
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Cellulose fiber reinforced thermoplastic composites: Processing and Product Charateristics
… in terms of (a) their impact on torque during melt processing of a thermoplastic cellulose ester (plasticized CAB); (b) their fiber incorporation and dispersion characteristics in a CAB-based composite by SEM and image analysis, respectively; and (c) their impact on the mechanical properties …
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Synthesis and evaluation of novel polymer modifiers for biodegradable polymers
… [PLA] have been studied after subjecting to melt processing conditions. Ester plasticizers were synthesized from citric, tartaric and maleic acids using various alcohols. A variety of PLA copolymers have also been prepared from poly(ethylene glycol) derivatives using stannous octanoate …
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The synthesis, stabilization and sintering of high performance semicrystalline polymeric powders
… could circumvent many of the environmental and processing problems prominent in the current state of the art. Aqueous dispersion prepregging requires that the matrix resin be in the form of a stable colIoidal dispersion, preferably of small uniform particles. Formation of submicron particles …
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Evaluation and design of polymer systems for enhanced microwave heating
… evaluated using dielectric testing and monitored processing in a multimode microwave cavity. Dielectric measurements were made using a field perturbation technique and a transmission/reflection technique. The electric loss factor of the epoxy system continuously decreased during cure. Results for …
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Dispersion and dissolution kinetics of API particles in pharmaceutical hot melt extrusion
Pharmaceutical Hot Melt Extrusion (HME) is essentially a special case of polymer compounding. The elementary steps involved in traditional plastics melt processing are handling of particulates, melting, dispersive and distributive mixing, devolatilization and stripping, and finally pressurization …
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The design, synthesis and properties of pressure-processable biodegradable block copolymers
… far below those needed in traditional melt-processing of biodegradable polyesters. Pressure molding at low temperatures reduces the danger of chain degradation during processing that is ubiquitous in biodegradable plastics. The compressible regular solution model (CRS), in combination …
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Structure-Property Relationships of Alicyclic Polyesters
… to reuse polyesters such as PET over multiple reprocessing cycles in the same application remains a challenge due to the susceptibility of the polymer to thermal, hydrolytic, and oxidative degradation during melt processing. The various degradation modes result in a drop in molecular weight, loss …
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Structure-Process-Property Relationships of Cellulose Nanocrystal Thermoplastic Urethane Composites
… structure and properties and optimize their processing. The useful applications for these materials extend from new drug delivery systems to improved materials for various transport industries and many more. Nanoscale materials which are commonly used include but are not limited to carbon …
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Hyperbranched Aromatic Polyesters and Their Application in Blends of Linear Polyamides
… good candidates for blend components or melt processing modifiers. In fact, hb polymers have already been used as blend components or additives aiming for different effects. In many cases, reduced viscosity and formation of miscible blends were observed by modification of a linear matrix …
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Oxidative and initiated chemical vapor deposition for application to organic electronics
… backbone. Neither spin casting from solution nor melt processing can be used. To answer to this challenge, a solvent-free method of oxidative chemical vapor deposition (oCVD) to synthesize conductive poly (3, 4-ethylenedioxythiophene) (PEDOT) films was demonstrated. The substrate temperature …
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Texture improvements in the high-temperature superconducting Bi₂Sr₂Ca₁Cu₂Ox̳/Ag system via surface energy driven grain alignment
The relation between processing, microstructure, and material property was investigated in the high-temperature superconducting Bi₂Sr₂Ca₁Cu₂Ox̳/Ag system. Experiments were based on a theoretical surface energy model proposing enhanced texture of the oxide at the Ag interface after melt-processing. …
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