title: Biodegradable multilayer barrier films based on alginate/polyethyleneimine and biaxially oriented poly(lactic acid).
abstract: A layer-by-layer (LBL) approach was used to assemble alternating layers of sodium alginate (ALG)/polyethyleneimine (PEI) on biaxially oriented poly(lactic acid) (BOPLA) films in order to produce bio-based all-polymer thin films with low gas permeability. Increasing the depositing of ALG and PEI from 0 to 30 layers results in large thickness variations (from 0 to 3.92 μm). After 30 ALG/PEI layers are deposited, the resulting assembly has an OTR of 1.22 cm(3)/(m(2) day atm). When multiplied by thickness, the resulting oxygen permeability (OP) is found to be less than 3.8×10(-17) cm(3) cm/cm(2) s Pa, which is almost 3 orders of magnitude lower than that of uncoated BOPLA film (1.8×10(-14) cm(3)cm/cm(2) s Pa). At the same time, the resulting multilayer-coated BOPLA films maintain high optical clarity and tensile properties. This unique barrier thin film has become a promising alternative to non-biodegradable synthetic food packaging materials.
authors: College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China.
authors: Chun-Hong
authors: CH
authors: Gu
authors: Jia-Jun
authors: JJ
authors: Wang
authors: Yang
authors: Y
authors: Yu
authors: Hui
authors: H
authors: Sun
authors: Ning
authors: N
authors: Shuai
authors: Bing
authors: B
authors: Wei
mesh_terms: D000464:Alginates / Q000737:chemistry*; D018857:Food Packaging; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D019344:Lactic Acid / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010539:Permeability; D011091:Polyesters; D011094:Polyethyleneimine / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013718:Tensile Strength; D014835:Volatilization; D014867:Water / Q000737:chemistry
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D011091:Polyesters; D011108:Polymers; D014867:Water; D019344:Lactic Acid; C033616:poly(lactide); D020723:Glucuronic Acid; D011094:Polyethyleneimine; D010100:Oxygen