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Showing 1 to 20 of 41 for “"Crystallization Behavior"”.
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Reactive modification and crystallization behavior of foamed poly(butylene terephthalate)
… data was based on fundamentals of extrusion, crystallization mechanisms, as well as information on reactivity and tendency toward degradation of PBT. As a preliminary study, the extrusion foaming behavior of a commercial linear semi-crystalline PBT with a chemical blowing agent (CBA) was …
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Crystallization behavior of poly (p-phenylene sulfide): kinetics and morphology
The crystallization behaviour of poly (p-phenylene sulfide) (PPS) has been studied. lsothermal rates of bulk crystallization, spherulitic radial growth rates, and nucleation densities were analyzed as functions of molecular weight of PPS, branching agent concentration, and chemical nature of the …
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Crystallization behavior and structure property behavior of selected thermoplastic polymers
The crystallization behavior of poly(p-phenylene sulfide) PPS has been studied. Two PPS samples with < M<sub>w</sub> > = 43K and < M<sub>w</sub> > = 83K were fractionated to remove low molecular weight oligomers yielding fractionated PPS samples with < M<sub>w</sub> > = 57K and < Mw > = 113K. The …
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Crystallization behavior of nylon 6/6 and its blends with poly(vinyl pyrrolidone)
… of poly(vinylpyrrolidone) (PVP). The melting behavior of pure nylon 6/6 was also studied during the course of this investigation. The melting behavior of nylon 6/6 was studied using a differential scanning calorimeter (DSC). Samples were isothermally crystallized at various temperatures from …
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The Effects of Melt Composition on The Crystallization Behavior of Sodiumand Barium Octaborate
Made available in DSpace on 2014-12-14T15:24:01Z (GMT). No. of bitstreams: 1 7714977.pdf: 6422031 bytes, checksum: 2f5264aa300a80c442a5090a5424e2c9 (MD5) Previous issue date: 1977
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Crystallization Behavior of Bisphenol-A Polycarbonate: Effects of Crystallization Time, Temperature, and Molar Mass
Crystallization and multiple melting behavior of bisphenol-A polycarbonate (PC) was investigated using differential scanning calorimetry (DSC) for the monitoring of thermal behavior and atomic force microscopy (AFM) for the morphology study. The exceedingly slow crystallization kinetics of PC and …
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Crystallization Behavior, Tailored Microstructure, and Structure-Property Relationships of Poly(Ether Ketone Ketone) and Polyolefins
… process parameters on semi-crystalline polymer crystallization and final properties. All objectives utilized the advanced characterization technique of fast scanning calorimetry (FSC) using the Mettler Toledo Flash DSC 1. The first half of this work focuses on the high-performance …
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Supramolecular polymer additives to improve the crystallization behavior and optical properties of polybutylene terephthalate and polyamides
… agents. These additives can increase the crystallization temperature and thus reduce cycle times during melt processing, affect the physical properties and can in some cases improve the optical properties (clarity and haze). This thesis describes the use of supramolecular nucleating agents …
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The Effect of Nanoscale Particles and Ionomer Architecture on the Crystallization Behavior of Sulfonated Syndiotactic Polystyrene
… properties which are directly related to their crystallization behavior. It is therefore critical to identify structure-property relationships for these materials. Sulfonated syndiotactic polystyrene (SsPS) is used as a model semicrystalline ionomer and two approaches are utilized to control the …
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Crystallization behavior and morphological features of two LARC polyimides and local orientation studies of two semicrystalline model composites
… studies. The primary topic involved the crystallization behavior and morphological features of two polyimides, namely LARCCPI (Langley Research .Center Crystalline folyimide) and LARC-TPI (Thermoplastic folyimide). The LARC-CPI study first considered feature~ affecting crystallization …
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The Effect of Nitrogen on The Crystallization Behavior of Barium-Silicon-Aluminum-Oxygen-Nitrogen Oxynitride Glasses (Phase Separation, Crystal Growth)
Oxynitride glasses in the Ba-Si-Al-O-N system which were clear, homogeneous, and free of metallic inclusions were produced using gel-derived oxide glass batches and electronic-grade Si(,3)N(,4). Nitrogen was found to act as a nucleating agent in the oxynitride glasses by inducing separation into …
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Chemical processing of lead metatitanate by co-precipitation and sol-gel methods: The role of powder and gel characteristics on crystallization behavior
… evolution of structure on heat treatment, and crystallization. Materials prepared by the two methods were amorphous in the as-prepared state, but transformed to the stable perovskite structure on heat treatment. Crystallization kinetics for the chemically prepared materials were compared with …
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Preparation, Crystallization and Properties of Amorphous Lead Iron Tungstate Ceramics
… quenching method; and on the properties, crystallization behavior and evolution of microstructure on heat treatment.
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Crystallization and melting behavior of (ε-caprolactone)-based homopolymer and triblock copolymer
… (LH) surface nucleation theory to the crystallization kinetics of poly(ε-caprolactone), PCL. This theory has successfully predicted a number of experimental observations such as the temperature dependence of spherulitic growth rates and the inverse relation between undercooling and the …
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Modeling Interfacial Slag Layer Phenomena in the Shell /Mold Gap in Continuous Casting of Steel
The model was also applied to interpret the crystallization behavior of slag. A mechanism for the formation of this crystalline layer was proposed that combined the effects of a shift in the viscosity curve, a decrease in the liquid slag conductivity due to partial crystallization, and an increase …
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Investigating the effect of amorphization method on the physicochemical properties and heat- and moisture-induced crystallization behaviors of amorphous sucrose
… changes, including stickiness, caking, and recrystallization, which decrease product stability and alter product quality attributes, such as texture, taste, aroma retention, and drug efficacy. As a result, the physical stability of amorphous sugars has stimulated substantial research; however, …
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I, Crystallization and morphological studies of ICI's intermediate temperature semicrystalline (ITX) polymer and, II, The influence of deformation (shear strain) during bond formation on adhesive bond strength
… investigation focused on evaluation of the crystallization conditions utilized in commercial consolidation of ICI's semicrystalline "ITX" polymer. Manipulating the initial polymer melting temperature and time was seen to influence the crystallization behavior and final morphology of the …
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Injection Molding of Pregenerated Microcomposites
… was to evaluate the ability to modify the crystallization behavior of a high melting TLCP (HX6000, Tm = 332° C) with a lower melting TLCP (HX8000, Tm = 272°C). It was found that it was possible to tailor the crystallization behavior of these TLCP/TLCP blends by varying the weight fraction …
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Polymer Crystallization: Micro- and Nano- Filler Effects on Isotactic Polypropylene
… studies about the effects of fillers on the crystallization behavior of composites are of great interest. Nucleated crystallization has been the subject of several studies over the last 50 years or so [Cormia et al. 1962, Binsbergen 1970, Mercier 1990]. In the relative simple case of …
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Tailored Chain Sequences of Brominated Syndiotactic Polystyrene Copolymers via Post-Polymerization Functionalization in the Heterogeneous Gel State
… of conventional block copolymer phase behavior, supporting that the Blocky copolymers contain distinct segments of pure sPS and segments of randomly brominated sPS. Crystallization behavior of the copolymers, examined using differential scanning calorimetry (DSC), demonstrates that the …
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