A method for producing a polymer film, comprising: measuring a first functional relationship between a weight percentage of tissue forming nanoparticles in a polymer film and a first property of that polymer film to obtain a first graph representing the first functional relationship, wherein the first property is a maximum load; and the first graph is a load graph representing the first functional relationship between the weight percentage of the tissue forming nanoparticles in that polymer film and the maximum load of that polymer film; measuring a second functional relationship between the weight percentage of tissue forming nanoparticles in a polymer film and a second property of that polymer film to obtain a second graph representing the second functional relationship, wherein the second property is a maximum stress; and the second graph is a stress graph representing the functional relationship between the weight percentage of tissue forming nanoparticles in that polymer film and the maximum stress of that polymer film; wherein maximum load and maximum stress are measured using a pull test system and wherein maximum load is the pull force in Newton applied to the polymer film when the polymer film breaks and wherein maximum stress in KPa is the pull force applied to the polymer film when the polymer film breaks divided by the cross-sectional area of the polymer film; determining a first weight percentage corresponding to a peak of the first graph and determining a second weight percentage corresponding to a peak of the second graph, wherein the first weight percentage and the second weight percentage have different values, thereby defining a range between the first weight percentage and the second weight percentage; determining an optimal weight percentage based on the first and second weight percentage values, by selecting a percentage from the range as the optimal weight percentage; producing a polymer film having tissue forming nanoparticles at the optimal weight percentage. measuring a first functional relationship between a weight percentage of tissue forming nanoparticles in a polymer film and a first property of that polymer film to obtain a first graph representing the first functional relationship, wherein the first property is a maximum load; and the first graph is a load graph representing the first functional relationship between the weight percentage of the tissue forming nanoparticles in that polymer film and the maximum load of that polymer film; measuring a second functional relationship between the weight percentage of tissue forming nanoparticles in a polymer film and a second property of that polymer film to obtain a second graph representing the second functional relationship, wherein the second property is a maximum stress; and the second graph is a stress graph representing the functional relationship between the weight percentage of tissue forming nanoparticles in that polymer film and the maximum stress of that polymer film; wherein maximum load and maximum stress are measured using a pull test system and wherein maximum load is the pull force in Newton applied to the polymer film when the polymer film breaks and wherein maximum stress in KPa is the pull force applied to the polymer film when the polymer film breaks divided by the cross-sectional area of the polymer film; determining a first weight percentage corresponding to a peak of the first graph and determining a second weight percentage corresponding to a peak of the second graph, wherein the first weight percentage and the second weight percentage have different values, thereby defining a range between the first weight percentage and the second weight percentage; determining an optimal weight percentage based on the first and second weight percentage values, by selecting a percentage from the range as the optimal weight percentage; producing a polymer film having tissue forming nanoparticles at the optimal weight percentage. <EOS>