聚甲醛因快速结晶形成高结晶度和大晶粒使厚壁大尺寸制件无法快速成型，协同调控结晶行为使结晶速率下降满足快速成型、保持高结晶度并形成细化晶粒确保制品高强高刚特性是解决途径，但同时降低结晶速率与保持高结晶度在结晶工程学上难以兼得。项目拟采用结晶生长抑制剂牵制或干扰POM分子链有序排列过程、迫使结晶速率下降以满足快速成型，同时运用成核剂降低生长受限环境中的成核能，提高晶核密度，确保高结晶度并细化晶粒。探明抑制剂对球晶生长和结晶动力学的抑制机理及影响规律；揭示成核剂对生长受限POM晶的成核机理及结晶促进规律。协同控制抑制剂降低结晶速率和成核剂提高结晶速率之矛盾、平衡抑制剂既降低结晶速率又降低结晶度之取舍、建立结晶速率控制和高结晶度保持之间的调控规律、达到“温和结晶并形成高结晶度和细化晶粒”之目的。项目实施将有效改善POM制品的加工局限性，为实现厚壁大尺寸制件的快速成型奠定坚实的理论基础。

Because of rapid crystallization, high crystallinity and large crystalline grains, the thick walled and large size parts of polyformaldehyde can not be rapid processed. The fundamental way is to synergetic control the crystallization behavior, which make the crystallization rate decrease to meet the rapid prototyping of POM large size parts, and simultaneously maintain high crystallinity and fine crystalline grains to ensure the products with high strength and high rigidity characteristic. However, it is very difficult to decrease the crystallization rate and maintain high crystallinity simultaneously in crystallography. The project plans to use spherulite growth inhibitors to restrict or interfere with the molecular chain ordering process, which forces POM with a decreased crystallization rate to meet its rapid prototyping. At the same time, the nucleation agents are used to reduce the nucleation energy of the confined POM chains, and to increase the nucleation density，ensuring high crystallinity and making the crystalline grain smaller. Ascertain both the restraining mechanism and the influencing patterns of inhibitors on the spherulite growth as well as the crystallization kinetics. Clarify the nucleation mechanism and crystallization acceleration of nucleation agents to POM crystallization with confined growth. Coordinate the contradiction between the crystallization rate decrease by inhibitors and the increase by nucleation agents. Balance the acceptance or reject of the inhibitors decrease both crystallization rate and crystallinity. Obtain the regular patterns between the controlling of crystallization rate and the maintaining of high crystallinity. Achieve a moderate crystallization rate with high crystallinity and fine crystalline grains. The implementation of the project will effectively improve the processing limitations of polyformaldehyde products, and laying a solid theoretical foundation to achieve the rapid processing of thick walled or large size parts of POM.