What is the polymer orientation structure?
The mechanism of orientation The amorphous polymer has two different structural units of motion - the orientation of the entire molecular chain and segment segments: through the internal rotation of the single bond, and the segments are arranged in parallel along the direction of the field. For example: in the high elasticity of the stretch, the entire molecular chain arrangement is still chaotic. The entire molecular chain orientation: the need for molecular chain of the coordinated movement, the molecular chain are arranged in parallel along the direction of the field. For example, in a viscous flow state, the external force can orient the entire molecular chain, but the segment may not be oriented. For the crystalline polymer, under the action of the external field, the orientation of the microcrystals occurs, that is, with the tilt and slip of the wafer, the original folded-chain wafer is stretched and rearranged to a new oriented folded-chain wafer , Straight chain microcrystalline or from the spherulite into a microfiber structure and so on.
According to the external force can be divided into: uniaxial orientation, biaxial orientation uniaxial orientation - fiber stretching biaxial orientation - film stretching
The main structural features of the orientation: anisotropy
Macromolecular chains, segments, or microcrystals can be arranged in an orderly direction along the external field, in some external fields (such as tensile stress or shear stress). This ordered parallel arrangement is called orientation, and the resulting aggregates State structure, known as the orientation structure.
