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Basics of Material
Tg
When an amorphous polymer is heated, the temperature at which the polymer structure turns “viscous liquid or rubbery" is called the Glass Transition Temperature, Tg. It is also defined as a temperature at which amorphous polymer takes on characteristic glassy-state properties like brittleness, stiffness and rigidity (upon cooling).
Basics of Material
Tm
Melting point, the temperature at which a substance changes from solid to liquid state
Basics of Material
Tc
Temperature at one liquid solidified
Basics of Material
Atomic number
proton number
Basics of Material
metal bonding
sharing of free electrons among a structure of positively charged ions.
Basics of Material
Polymorphism:
e.g. same motif but different unit cells and therefore different crystal structures, like iPB-1
Basics of Material
(1) unit cell or elementary cell
An elementary cell (sometimes called a unit cell) is a unit from which a crystal lattice can be built by repeated translation in three directions.
Unit cells are connected using lattice points.
Basics of Material
2) crystal lattice or space lattice
Infinite arrangement of points in space (3D) or in the plane (2D) or on a line (1D), in which all points have the same surroundings.
Basics of Material
(3) crystal motif or basis
The motif consists of the arrangement of the building blocks (atoms, molecules) of a unit cell.
Basics of Material
Texture
Orientation of crystalsl within a Material
Basics of Material
crystalline structure for metals
atoms with define position
Basics of Material
a table-top of polyethylene of a thickness of 4mm is not transparent why?
because while the material is cooling down, some crystals will be formed, this could be avoid through a really short cooling rate, the amount of amorphous areas will keep at its maximum.
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