Composite chlorine plasticizer is a new type of environmental protection plasticizer, which is improved on the original plasticizer, we all know that the main role of plasticizer is plasticizing, so what are the factors affecting plasticizing?
1. When the polymer's intermolecular force composite chlorine plasticizer is added to the polymer, the interaction between the composite chloride plasticizer molecules, the composite chloride plasticizer and the polymer molecule has a great influence on the plasticizing effect. This interaction is mainly van der Waals force and hydrogen bond force, and Van der Waals also includes 3 kinds of dispersion force, inductive force and orientation force.
(1) Van der Waals force dispersion force exists between all
polar or non-polar molecules, with the interaction of tiny instantaneous
dipole, so that the proximity of the dipole in the heterogeneous adjacent state
of the suction, but only in the non-polar system, its dispersion force occupies
the main position. When a molecule with dipole induces an inductive dipole in
an adjacent non-polar molecule, the molecular attraction between the inductive
dipole and the inherent dipole is called the inductive force. For aromatic
compounds, the inductive force is particularly strong. The plasticizing effect of polystyrene and
low molecular weight ester is mainly inductive force. When polar molecules are close to each other,
due to the inherent dipole orientation, it causes a force between molecules,
often referred to as the orientation force. The interaction between ester plasticizers and PVC is a representative example.
(2) Hydrogen bonds contain molecules of-oh-based or-nh-groups, such as polyamide, polyvinyl alcohol, etc., can form hydrogen bonds between molecules. Hydrogen bonds are a relatively strong interaction bond, and their presence prevents plasticizer molecules from being inserted into polymer molecules. The more dense the hydrogen bond is distributed along the molecular chain of polymers, the more difficult it is to insert the corresponding plasticizer molecules, so that plasticizers are required to produce a similar strong effect as polymer molecules. When the temperature rises, the thermal movement of molecules hinders the orientation of polymer molecules, the role of hydrogen bonds decreases accordingly.
2. Molecular crystallinity of polymers it is much more difficult to insert a molecule into a crystalline region than to insert an amorphous region. There is less free space between polymer chains in the crystalline region. If the molecules of the composite chlorine plasticizer can only be inserted into the amorphous region of some crystalline polymers, the plasticizer is a non-solvent plasticizer. If the molecules of the composite chlorine plasticizer can be inserted into the amorphous region of the polymer and can be inserted into the crystalline region, the plasticizer is a solvent-based plasticizer, the so-called main plasticizer. The molecules of polymers have a certain influence on the plasticizing effect of composite chlorine plasticizers, so we must pay attention to them when plasticizing.