Heat and compression molded electrospun poly(l-lactide) membranes: Preparation and characterization

The fibrous membranes prepared by electrospinning have great advantages, such as high porosity and high specific surface area. However, low mechanical strength of electrospun membranes has been one of the most difficult technical problems to overcome, resulting in negative impact on the application. In this paper, the heat-assisted compression approach was employed to improve the mechanical performances of electrospun poly(l-lactide)(PLLA) membranes, especially in tensile strength. It is found that the electrospun PLLA membranes crystallize in α form and strong fiber-to-fiber linkages occurred with the aid of heat and compression. The tensile properties including tensile strength and modulus of membranes treated with a press at 6 MPa and a temperature at 60 °C (80 °C and 100 °C) increased by more than 100% compared with those of the as-electrospun membranes.