Epitaxial effects on polymer crystallization

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August undefined, 2024

WebJun 1, 2024 · The crystallization temperature of polymer greatly increases as heat-treatment temperature decreases in domain II. (3) In domain III, heat-treatment temperature values are too low, leading to partial melting.

Epitaxial layer crystallography Britannica

WebFeb 17, 2024 · Polymorphic polypropylene (PP) has been frequently selected for investigation due to their rich crystalline modifications, including monoclinic α-form, … WebWhen melting at 300 °C and crystallization at low temperature, e.g., 120 °C, both edge-on and flat-on lamellae were observed. At elevated crystallization temperature, e.g., 150 °C, the flat-on... nist encryption key

Nucleation in Polymer Crystallization Encyclopedia MDPI

WebThe traditional thoughts regarding the crystallization process involve the epitaxial growth of a polymer crystal in the form of a lamella. This model will be the one we present … WebApr 4, 2024 · The perovskite LaCoO3 and La0.8Sr0.2CoO3 thin films were synthesized successfully by a polymer-assisted deposition method. The structural characterization and thermal decomposition measurements indicate that appropriately increasing the annealing temperature is helpful in improving the film crystallinity. Compared with LaCoO3 films, … Websingle polymer crystals3 (see Figure 2.2 (b)). During such a process the monomers forming a crystal can be joined up into chains by solid state polymerization, while the original “monomer” crystals are preserved. The final polymer crystal is obtained due to chemical reactions at the gas/solid or liquid/solid interface and not just as a ... nist cybersecurity frameworks

Epitaxial layer crystallography Britannica

Origin of Epitaxial Cold Crystallization of Poly(L‑lactic acid) on ...

WebEpitaxy is defined as the oriented overgrowth of film material and typically refers to the growth of single crystal films. Homoepitaxy is the epitaxial growth of a deposit on a … WebThe final properties of semicrystalline polymer materials are affected by all of the following: the starting melt, paths of nucleation, organization of lamellar crystals and evolution of the final crystalline structures. nist foundedWebJan 27, 2024 · During soft-epitaxial crystallization process, the polymer chains prefer to align along the tube axis regardless of the disregistry [ 2, 4, 13 ]. For example, 1D-carbon nanotubes (CNT) could induce the soft-epitaxial crystallization of semi-crystalline polymer on the surface of CNT. nist for ir process or soc

"WebJun 1, 2013 · The influence of crystal dimensions of both the substrates and the deposited polymers on epitaxial growth confirms that secondary nucleation is an important controlling factor for the occurrence ... " - Epitaxial effects on polymer crystallization

Epitaxial effects on polymer crystallization

Polyethylene–isotactic polypropylene epitaxy: Analysis of the ...

WebJan 27, 2024 · The ED patterns proved the coexistence of PCL and PEG single crystals, and PEG crystallized on the both folding surfaces of PCL single crystals to form a triple-layered structure. 71 Similarly, Cheng et al. studied the solution crystallization behavior of PCL- b -PEO, in which the PCL and PEO blocks have similar Tc s. 72 They found that … Webcrystallization sites can be separated and thus the nature of the polymer segments as yet uncrystallized becomes important5. While macromolecular crystallization can occur …

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WebFrom the dependence of the width of ribbons on the crystallization conditions (i.e., the cooling rate and annealing), it has been concluded that the polymer chain is aligned … WebThe i-PMMA thin film on highly oriented HDPE exhibits a much faster crystallization rate than usual, providing not only a good method for the preparation of crystalline i-PMMA …

WebDec 16, 2010 · The effect of N -Aminophthalimide compound (NA-S) as nucleating agent on crystallization behavior and morphology of poly (lactic acid) was studied. With polarized optical microscope (POM), the unique phenomena of nucleation and epitaxial crystallization of PLA/NA-S system were observed. WebJan 1, 2015 · It was found that epitaxial crystallization is effective in governing the crystallization process of polymers. It can control the crystal structure and its orientation. For instance, the use of a special nucleation agent can generally produce only spherulitic … Readership: Polymer scientists, or scientists in related fields interested in polymer …

WebAbstract Diffraction patterns of oriented blends of isotactic polypropylene (iPP) and polyethylene (PE) published recently by several authors are analyzed on the basis of a unique epitaxial relationship between the iPP and PE crystal lattices. WebFrom the dependence of the width of ribbons on the crystallization conditions (i.e., the cooling rate and annealing), it has been concluded that the polymer chain is aligned parallel to the striation directions and that the ribbon width corresponds to the lamellar width.

WebDec 20, 2024 · The epitaxial crystallization is a kind of interfacial crystallization. Therefore, the epitaxial crystallization of semi-crystalline polymer on the surface of a …

WebJan 3, 2024 · Fig. 1, top left, shows the bulk PP containing nucleating heterogeneities with different efficiencies of nucleation.Impurity A is much more efficient than impurity B, i.e., it offers to the PP chains a lower heterogeneous nucleation free energy barrier (this can be due to its chemical nature, interactions with PP, epitaxial crystal structure match and … nist headquartersWebwell-established that polymer chains orient and stretch in the flow field 11, 12. Subsequently, the oriented molecules coalesce to form fibrous bundles (shish), which act as a template to promote the epitaxial crystallization of folded-chain lamellae perpendicular to the shish, so as to form the shish kebab structure 13, 14. However, due nist for suasWebEpitaxy refers to a type of crystal growth or material deposition in which new crystalline layers are formed with one or more well-defined orientations with respect to the crystalline seed layer. The deposited crystalline film is … nist gaithersburg jobs