An Experimental Study On The Morphology And Structure Of Polypropylene In Rapid Heat Cycle Molding

Rapid Heat Cycle Molding (RHCM for short) is a rapid process of green molding technology which can get excellent quality of appearance and performance products. The forming mechanism and overall performance products of RHCM have been receiving sufficient attentions of researchers from around the world. Scientific analysis of the relationships between the process and microstructure and properties should be studied to improve the quality of plastic. In this study, the formation process and the variation law of morphology in RHCM were obtained based on the experimental study. The main works are as follows:1. Isotactic polypropylene was selected as the materials. Variable mold temperature molding experiments were done. Characterization methods of Morphology and structure were designed. Multilayer structure, crystallinity, orientation parameter and the content of beta polypropylene, the parameters which were got by the test of SEM and XRD were selected as the characterization parameters. The multi-point were studied based on the morphological structure of a single point, researching the formation of complete morphology evolution.2. Multilayer structure, crystallinity, orientation parameter and the content of beta polypropylene of the selected solo point were studied for discussion about the relationships between CIM and RHCM, and analyze the differences on both sides of the mold.3. The prevailing method of multi-point sampling was proposed according to melt filling simulation and experimental results. The morphological structure of13points was explored in RHCM with the research method of a solo point, and obtained the change curves of four characterization projects.