Packaging material and methods of using the same

Abstract

The present disclosure is directed to films. The films can include polyamic acid (PAA). Methods of making and using the film for food product coverings is also included.

1 .- 37 . (canceled) 
     
     
         38 . A film comprising:
 polyamic acid (PAA);   glutaraldehyde (GA); and   one or more molecule selected from the group consisting of alanine (A), tryptophan (W), 2-benzoylbenzoyl (BB), Polycaprolactone (PCl), L-Cysteine (C), D-glucosamine (DA), dipropylene glycol (DP), p-aminobenzoic acid (pAB), L-isoleucine (I), p-aminosalicylic acid (pAS), sulfanilic acid (SA), and 5-aminosalicylic acid (5AS).   
     
     
         39 . The film of  claim 38 , wherein the one or more molecule is selected from the group consisting of sulfanilic acid (SA), p-aminosalicylic acid (pAS) and 5-aminosalicylic acid (5AS). 
     
     
         40 . The film of  claim 38 , wherein the one or more molecule is selected from the group consisting of alanine (A), tryptophan (W), 2-benzylbenzoyl (BB), L-Cysteine (C), D-glucosamine (DA), dipropylene glycol (DP), p-aminobenzoic acid (pAB), L-isoleucine (I), p-aminosalicylic acid (pAS), and 5-aminosalicylic acid (5AS). 
     
     
         41 . The film of  claim 38 , wherein the film has a thickness of about 0.02 mm to about 0.12 mm. 
     
     
         42 . The film of  claim 38 , wherein the film has a modulus of elasticity of about 2.2 GPa to about 4.1 GPa. 
     
     
         43 . The film of  claim 38 , wherein the film has a tensile strength of about 59.9 MPa to about 95.1 MPa. 
     
     
         44 . The film of  claim 38 , wherein the film has an antibacterial activity of reducing the number of colony forming units (CFUs) by up to about 90%. 
     
     
         45 . The film of  claim 44 , wherein the antibacterial activity against one or more of gram-positive and gram-negative bacterial species. 
     
     
         46 . The film of  claim 45 , wherein the gram-positive species is  Staphylococcus epidermidis  and  Listeria monocytogenes.    
     
     
         47 . The film of  claim 45 , wherein the gram-negative species is one or more of  Escherichia coli, Enterobacter aerogenes, Aeromonas hydrophila , and  Citrobacter freundii.    
     
     
         48 . The film of  claim 38 , wherein the film is synthesized from a solvent and does not include any petrochemical material. 
     
     
         49 . The film of  claim 38 , wherein the solvent is ethanol. 
     
     
         50 . The film of  claim 38 , wherein the film further comprises water. 
     
     
         51 . The film of  claim 38 , wherein the film further comprises acetic acid. 
     
     
         52 . The film of  claim 38 , wherein the concentration of GA is between about 0.21% and about 0.35%. 
     
     
         53 . The film of  claim 38 , further comprising one or more of an adipate, a phthalate, a citrate and chitosan. 
     
     
         54 . The film of  claim 38 , further comprising one or more of an oleic acid, a palmitoleic acid, a sapienic acid, a linoleic acid, a nitrile, a polychloroprene, a chlorinated polyethylene, an epichlorohydrin, a sabacate, a terephthalate, a gluterate, and an azelate. 
     
     
         55 . A film comprising:
 polyamic acid (PAA);   a cross-linker; and   a small molecule, wherein the small molecule is a molecule having a molecular weight of less than about 900 Daltons.   
     
     
         56 . The film of  claim 55 , wherein the cross-linker comprises one or more of glutaraldehyde and carbodiimidazole. 
     
     
         57 . The film of  claim 55 , wherein the small molecule is one or more molecules selected from the group consisting of sulfanilic acid (SA), p-aminosalicylic acid (pAS) and 5-aminosalicylic acid (5AS). 
     
     
         58 . The film of  claim 55 , wherein the small molecule is one or more molecules selected from the group consisting of alanine (A), tryptophan (W), 2-benzylbenzoyl (BB), L-Cysteine (C), D-glucosamine (DA), dipropylene glycol (DP), p-aminobenzoic acid (pAB), L-isoleucine (I), p-aminosalicylic acid (pAS), 5-aminosalicylic acid (5AS). 
     
     
         59 . The film of  claim 55 , wherein the small molecule is one or more molecules selected from the group consisting of alanine (A), tryptophan (W), 2-benzylbenzoyl (BB), Polycaprolactone(PCl), L-Cysteine (C), D-glucosamine (DA), dipropylene glycol (DP), p-aminobenzoic acid (pAB), L-isoleucine (I), p-aminosalicylic acid (pAS), sulfanilic acid (SA), 5-aminosalicylic acid (5AS). 
     
     
         60 . The film of  claim 55 , wherein the film further comprises water. 
     
     
         61 . The film of  claim 55 , wherein the film further comprises acetic acid.