EXTENDED ABSTRACT: Polymer materials are characterized by long chain, high viscoelasticity, etc., which form different structures under different processing fields and strongly affect the service performance. Traditional polymer processing-structureproperty research is still in the “black box” mode. In order to understand the effect of processing field on the structure and performance of polymers, there is an urgent need to establish a high-throughput experimental method with high time resolution and multi-scale characterization capability. Synchrotron radiation characterization technology has obvious advantages in time and space resolution, which is suitable for high throughput in-situ characterization of rapid evolution of polymer multi-scale structure. The Shanghai Synchrotron Radiation Facility (SSRF) has high time resolution, wide detection scale and large experimental space, which is suitable for industrial polymer processing equipment to carry out research. Based on the SSRF, this work has developed a series of polymer processing-structural high-throughput in-situ characterization platform, including shear rheometer, tensile rheometer with the characteristics of the processing field, and industrial block and film processing equipment, which can realize in-situ study of the polymer crystallization process and the multilevel structural evolution under the strong processing external field. This report mainly introduces the following contents: (1) the development of industrial injection molding processing in-situ research device, co-extrusion film blowing in-situ research device, film multi-dimensional stretching processing in-situ research device, through the synchrotron X-ray diffraction/scattering technology linkage, to realize the in-situ tracking of the evolution of multi-scale structure of polymer in processing. (2) To study the polymer structure evolution under the typical pressure-shear-temperature coupled external field in injection molding processing, and to obtain the growth windows of polypropylene, meso-gauge polystyrene, and poly(lactic acid) polycrystalline types; to reveal the pressure sensitivity of polypropylene β-crystalline growth; to discover a new physical phenomenon that usually amorphous polycarbonate can be rapidly crystallized under the action of the pressure shear field; and to discover the existence of a distinctive polyolefin orientation crystallization behavior of polyolefin in injection molding processing and its molecular weight dependence; found polypropylene in injection molding processing shear flow-induced generation of β-crystalline and its dependence on the melt temperature; the development of in-situ injection molding based on the study of the processing window to quickly determine the method; the above results for the injection molded products structure of the precise control, to achieve its high performance to provide new methods and new ideas. (3) Based on the in-situ high-throughput research device for film blowing, the evolution of multi-scale structure in polymer film processing has been revealed, and the crystal structure evolution has been revealed, which provides direct guidance for the optimization of film blowing process.
Keywords: Polymer materials; Polymer processing; Multi-scale structure; Performance; In-situ investigation