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Semi-crystalline polymers with strong crystalline regions resist deformation and cavitation, the formation of voids in the amorphous phase, drives yielding. [25] As done in crystalline materials, particles can be added to semi-crystalline polymers to change the mechanical properties.
In condensed matter physics and materials science, an amorphous solid (or non-crystalline solid) is a solid that lacks the long-range order that is a characteristic of a crystal. The terms " glass " and "glassy solid" are sometimes used synonymously with amorphous solid; however, these terms refer specifically to amorphous materials that ...
Amorphous solid: A solid in which there is no far-range order of the positions of the atoms. Crystalline solid : A solid in which atoms, molecules, or ions are packed in regular order. Quasicrystal : A solid in which the positions of the atoms have long-range order, but this is not in a repeating pattern.
All polymers (amorphous or semi-crystalline) go through glass transitions. The glass-transition temperature (T g) is a crucial physical parameter for polymer manufacturing, processing, and use. Below T g, molecular motions are frozen and polymers are brittle and glassy. Above T g, molecular motions are activated and polymers are rubbery and ...
An amorphous metal (also known as metallic glass, glassy metal, or shiny metal) is a solid metallic material, usually an alloy, with disordered atomic-scale structure. Most metals are crystalline in their solid state, which means they have a highly ordered arrangement of atoms. Amorphous metals are non-crystalline, and have a glass-like structure.
Amorphous materials, such as liquids and glasses, represent an intermediate case, having order over short distances (a few atomic or molecular spacings) but not over longer distances. Many materials, such as glass-ceramics and some polymers , can be prepared in such a way as to produce a mixture of crystalline and amorphous regions.
Examples of materials with short range order include amorphous materials such as wax, glass and liquids [2] as well as the collagen fibrils of the stroma in the cornea. [ 3 ] Besides ordering of atoms, short-range ordering of vacancies are also possible.
In the context of solids, amorphous and crystalline are terms used to describe the structure of materials. Amorphous solids are the opposite of crystalline. The atoms or molecules in amorphous substances are arranged randomly without any long-range order. As a result, they do not have a sharp melting point. The phase transition from solid to ...