Preparation of solid-phase shear milling PVC / clay nanocomposites

Title: Preparation of solid-phase shear milling PVC / clay nanocomposites
　　Author: Chen Jianjun
　　Degree-granting units: Xi'an University of Technology
　　Key words: solid-phase shear milling;; from plasticized;; PVC;; kaolin;; nanocomposites
　　Summary:
　　Polyvinyl chloride (PVC) is the world's first industrial production of the plastic variety, but the PVC is a brittle material, the defects of this poor toughness of PVC greatly restrict the further development and wide application. Therefore, the need for PVC for enhanced Neodymium magnets toughening research in order to get high performance PVC material.
　　Force the use of disc-shaped chemical reactor at room temperature and under the conditions of preparation of solid PVC powder. PVC by milling treatment allows the inherent multi-level structure and the destruction of microcrystalline structure, particle size and molecular weight decreased. After 40 milling process, PVC particle size d (0.1) by the 84.29μm into 12.46μm; plasticizing time from 294s down to 90s, plastics and melt rates have increased in efficiency, reduced to balance the torque from 42.7Nm 38.4Nm, processing performance is significantly improved; after 30 milling treatment increased elongation rate from 57.00% to 202.1%; after 15 times the tensile strength by the milling treatment 49.50MPa to 53.25MPa; grind through 10 After the grinding process by the notched impact strength of 3.91 kJ/m2 to 4.30 kJ/m2.
　　Force the use of disc-shaped chemical reactor at room temperature and prepared under the conditions of solid PVC / clay nanocomposite powders (FT-3) and PVC / expanded clay nanocomposite powders (FT-4). XRD and SEM analysis showed that: solid-phase shear milling produces a strong shear, compression, friction and other effects caused by PVC phase and kaolin with a variety of complex physical and chemical changes, the performance of kaolin particle size smaller than the particle surface area increase, PVC / kaolin interface interaction enhanced.
　　Discussed the number of milling, kaolin content, the amount of rare earth stabilizer and plasticizer of PVC / clay nanocomposite mechanical properties. The results showed that: 30 times the number of milling, kaolin content of 8%, rare earth stabilizer content of 3%, PVC powder content of 30%, the best mechanical properties of composite materials. Composite filled with simple methods, preparation of solid-phase shear grinding technology of PVC / clay nanocomposites http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php have greatly improved mechanical properties to achieve the strengthening and toughening.
　　SEM and TEM analysis showed that: The part of milled kaolin with a diameter less than 30nm and the thickness to diameter ratio of 10 times the nanoparticles uniformly dispersed in the PVC matrix. TGA can be seen that the thermal stability of composite materials is much better than pure PVC material, pure PVC material in 122 ℃, I started weight loss, and composite materials began in 156 ℃ weight loss, and weight loss to be more than pure PVC low 7.12%.
　　Degree Year: 2010