What is the secondary crystallization and post-crystallization of the polymer?
After the crystallization: refers to a part of the area is not too late, continue to crystallize in the process of forming, do not form a new crystal area, and in the spherulite interface to further enlarge the crystal, is the beginning of the crystallization.
Secondary crystallization: refers to a crystallization, in the residual amorphous and crystalline incomplete part of the region, continue to crystallize and gradually improve the process, this process is very slow, may be several years or even decades.
As the name suggests, the secondary crystallization is in the first crystallization, the late occurred in the initial crystal structure under the imperfect site or occurred in the initial crystallization of the amorphous area of the phenomenon of re-crystallization in the stress, annealing is occur.
