Spherulitic crystallization
WebOct 11, 2024 · Spherulitic growth rate is related to the crystallization temperature and is nonlinear in non-isothermal conditions of the polymeric blends. The POM shown in Figure 1 , the spherulitic growth rate of the blends presents regular growth with the addition of LMPP contents, affecting the size and shape of the spherulites. WebJan 1, 2001 · This study aims to make a spherical spherulite of NTO by cooling crystallization using co-solvent. N -methyl-2-pyrrolidone (NMP) and water were …
Spherulitic crystallization
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WebJul 20, 2004 · (III) A discussion is given concerning the shape of the bulk‐crystallization isotherms associated with spherulitic growth, including stage‐1 and stage‐2 crystallization, and the presence of amorphous material in the spherulites. REFERENCES 1. P. H. Geil, J. Appl. Phys. 33, 642 (1962). Google Scholar Scitation 2. J. D. WebNov 4, 2010 · Spherulitic crystals are found in association with many materials and diseases, but the fundamental formation mechanism is not well understood. Using maleic …
WebIt is established that phase field methods naturally account for diffusional instabilities that are responsible for dendritic single-crystal growth. However, a generalization of this … WebMar 18, 2016 · A method of gradient cooling-down isothermal crystallization was used to prepare layered spherulites. The polyester was dissolved in chloroform to obtain a uniform solution (3 wt% for PLLA and 2 wt% for PHB). A drop of the solution was cast and uniformly spread on a clean glass slide.
Webkeith, h.d., spherulitic crystallization from melt .i. fractionation + impurity segregation + their influence on crystalline morphology, journal of applied physics 35: 1270 (1964). Google Scholar KELLER, A, THE SPHERULITIC STRUCTURE OF CRYSTALLINE POLYMERS .2. WebSep 24, 2001 · Spherical crystals of explosives can improve insensitivity toward a sudden shock, its performance, processablity and packing density. As a result, desirable shape of …
WebThe proto-dolomite crystallization proceeds via spherulitic growth that follows a growth front nucleation mechanism with a de-nuovo and continuous formation of nanocrystalline proto-dolomite subunits that form spherical aggregates. In stage three of the reaction, the proto-dolomite transforms to highly crystalline and stoichiometric dolomite on ...
Artificial glass sometimes crystallizes and contains spherulites that may be as large as a marble. As the glass has little similarity in chemical composition to volcanic obsidians, these spherulites when analyzed throw little light on the mineral nature of spherulites in rocks. They show, however, that in viscous semi … See more In petrology, spherulites are small, rounded bodies that commonly occur in vitreous igneous rocks. They are often visible in specimens of obsidian, pitchstone, and rhyolite as globules about the size of millet seed or rice grain, … See more Under the microscope the spherulites are of circular outline and are composed of thin divergent fibers that are crystalline as verified with polarized light. Between crossed See more Occasionally spherulites are found that are many centimeters and, even more rarely, up to two or three meters in diameter. Those spherulites, which are more than 20 centimeters in … See more Variolites are a type of radiate fibrous growth, resembling spherulites in many respects, consisting of minute feathery crystals spreading … See more Spherulites are most common in silica-rich glassy rocks. Sometimes they compose the whole mass; more usually they are surrounded by a glassy or felsitic base. When obsidians are devitrified, the spherulites are often traceable, though they may be more or … See more Very large and cavernous spherulites are called lithophysae; they are found in obsidians at Lipari, in Yellowstone Park and other places. The characteristic radiate fibrous structure is … See more taggarts kennishead road glasgowWebLow-temperature annealing close to the glass transition temperature (Tg) leads to the formation of crystal nuclei, which grow to crystals at higher temperatures, and yield a much finer spherulitic superstructure, as obtained after direct melt-crystallization. taggarts hoursWebJan 28, 1999 · Chitosan crystallization, performed by simple drying of an oligomer or polymer solution on a glass or mica surface, was studied at room temperature. Polarizing … taggarts land rover maryhill roadWebApr 19, 2024 · Various spherulites or spherulitic crystals are widely encountered in polymeric materials when crystallized from viscous melts or concentrated solutions. However, the microstructures and growth processes are quite complicated and remain unclear and, thus, the formation mechanisms are rather elusive. Here, diverse kinds of … taggarts land rover lanarkshire motherwellWebSpherulite formation is an example of self-assembly, where building blocks spontaneously arrange themselves into larger, more complex structures. These structures determine the material's functionality in both foods and biological systems. Understanding of spherulite formation is limited. taggarts motherwell serviceWebWe have proposed that spherulitic crystallization, if not the actual mechanism, serves as a viable model for granule initiation in vivo and that the results of this research will further the understanding of this still mysterious but highly significant biological phenomenon. taggarts land rover glasgow north glasgowWebMar 25, 2005 · Crystallization, Plant derived food, Polymers Abstract The influence of cooling rate and quench temperature on the formation of spherulitic morphology in heated mung bean starch is reported. Spherulites were obtained for a wide range of cooling rates (2.5−250 °C/min), provided the system was heated to 180 °C and then cooled below 65 °C. taggarts land rover south glasgow