There are many literature reports on the research on the plasticizing mechanism of environmentally friendly plasticizers. It is generally believed that the plasticization of polymer materials is due to the polymer in the material. It is caused by the weakening of the aggregation effect between macromolecular chains. Due to the mutual attraction of the macromolecular chains of the polymers, they are strongly gathered together. • This attraction, for non-polar polymers, is mainly dispersion force;
YesFor polar polymers, in addition to dispersion force, there is also dipole attraction, span>Due to the existence of these forces, it hinders the movement of large pre-chains. As a result, the polymer remains in a hard state and is difficult to deform. To make the polymer easy to To process and shape, or to make it soft, you must first try to make the high poly ObjectThe gravitational force between macromolecular chains weakens, or the aggregation between macromolecular chains must be weakened. When environmentally friendly plasticizers are added to polymers, or plasticizer molecules are inserted between polymer molecular chains, the polymer molecular chains are weakenedThe gravity between.Increases the mobility of polymer molecular chains,Thus increasing the plasticity of the polymer.
Take polyvinyl chloride as an example. Due to the presence of chlorine atoms, polyvinyl chloride has strong dipoles between molecular chains. Gravity. However, under heating, due to the intensification of thermal movement of molecular chains, the mutual attraction of molecular chains decreases and the distance increases. At this time, plasticizer can be added between the polyvinyl chloride molecular chains.
If the plasticizer molecule contains a polar part and a non-polar part, then this polar group and polyvinyl chloride The polar part of the molecular chain undergoes dipole attraction. In this way, after cooling, the plasticizer molecules can still stay in their original positions in the polyvinyl chloride. The non-polar part of the plasticizer can move the polyvinyl chloride The molecular chains are separated, increasing the distance between them, weakening the attraction between them, making the movement of the polyvinyl chloride molecular chains easier, and resulting in a series of changes in the physical and mechanical properties of polyvinyl chloride, such as lowering The aggregation force and stiffness between polymer molecular chains increase the softness and plasticity and reduce the melt viscosity and flow temperature of the polymer. In this way, environmentally friendly plasticizers can adjust the properties of the polymer and make it easy to process. role.
