Advanced Materials Research Vols. 87-88

Abstract: A kind of novel biodegradable poly(hexamethylene adipate) (PHMA) nanofibers with diameter of 100～700nm using a mixed solvent of 1,2-dichloroethane (DCE ) and trifluoroacetic acid (TFA) were obtained by electrospinning process in this paper. The morphology of electropun PHMA nanofibers were investigated by scanning electron microscopy (SEM). The results showed that the morphology, diameter and uniformity of the fibers were influenced by solvent ratio, solution concentration, applied voltage, capillary–screen distance and flow rate greatly. The finer and uniform nanofibers were electrospun from a mixed solvent of DCE and TFA with ratio of 70/30(w/w).

Abstract: The relationship of maximum power relative to rotor clearance, filling factor, rotor speed, ram piston pressure and cooling water temperature was studied for the VIC(Variable Intermeshing Clearance) mixer. The study result by single-factor experiment method showed that in certain extent, the larger the value of rotor clearance, filling factor, rotor speed, ram piston pressure, the larger the value of maximum power would be; the smaller the value of cooling water temperature, the larger the value of maximum power would be. And the study result by quadratic orthogonal regression combinational design gave the mathematical expressions of maximum power.