2013年8月27日星期二

gearbox mechanism of action

(1) dispersion forces, dispersion forces present in all polar or non-polar molecules is due to the  titanium dioxide slight transient dipole dipole interaction so near to the adjacent poles in the state resulting from a gravity. But only in the non-polar systems such as benzene, polyethylene or polystyrene, the dispersion force component of the more significant only account.
(2) with a fixed-induced dipole forces when the adjacent molecules, a non-polar molecule that induces an induced dipole, dipole-induced dipole and attraction between intrinsic induction force is called. Because π electron aromatic compounds can be highly polarized so the impact is particularly strong, such as low molecular weight esters and between polystyrene and polyvinyl acetate or benzene, mainly between the induction force.
(3) When the polarity of the molecule orientation force close to each other, due to the inherent causes the orientation of the dipole intermolecular force is called an orientation force. PVC plasticizer such as esters or cellulose nitrate is a representative example of the interaction. 2 bond containing-OH group or-NH-group of molecules, such as polyamide, polyvinyl alcohol, cellulose, etc., between the molecules, and sometimes can form hydrogen bonds within the molecule. Bond is a relatively strong interaction key, they do not interfere plasticizer molecules into the polymer molecules, the hydrogen bonds along the polymer chain if more dense distribution of the plasticizer into the appropriate role against the stronger. Therefore, the plasticizer and the polymer molecules required to produce a similar effect of a strong. The other hand, as the temperature increases, the molecular attraction between the hydrogen bonds weaken significantly reduced, because the  plastic flame retardant thermal motion of molecules hinder orientation of the polymer molecules.
3 space syndiotactic structure of the polymer molecular chains to crystallize under the proper conditions, the molecular chain and clutter from the volume state into regular rows of tightly folded state. In normal conditions, the industrial production of the polymer can not be completely crystallized, but often scattered by the crystalline areas in the amorphous region inserted configuration.
Obviously, the plasticizer molecules than inserting into the crystalline regions amorphous region is much more difficult, since the polymer in the crystalline region and the  Stearate calcium free space between the chain Min. If the plasticizer molecules fit into a partially crystalline amorphous region of the polymer, this plasticizer plasticizer is a non-solvent, which is called a secondary plasticizer. If only the plasticizer molecules into amorphous region of the polymer into the crystalline regions while, then the solvent plasticizer is a plasticizer, which is called the primary plasticizer.

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