聚合物密封层在原子层沉积Al2O3涂层的纤维基包装材料上的附着力研究

Adhesion of Extrusion-Coated Polymer Sealing Layers to a Fiber-Based Packaging Material with an Atomic Layer Deposited Aluminum Oxide Surface Coating

0引言 随着环保问题日益得到重视，纤维基（纸基）包装材料将朝着使用更少材料、更薄涂层的方向发展。人们正在研究涂层技术以获得更好的阻隔性能。其中原子层沉积（ALD）技术显示出无限的潜力。原子层沉积Al2O3涂层具有更好的阻隔性能。

Adhesion of extrusion-coated polymer sealing layers on an atomic layer deposited （ALD） aluminum oxide （ Al2O3 ） surface coating was investigated with a view to gain information on the applicability of ALD deposited barrier layers in fiber-based packaging materials. The polymers used for the sealing layer were low density polyethylene （LDPE）, polyethylene terephthalate （PET）, and polylactide （PLA）. They were extrusion-coated onto the ceramic side of paper/PET/ Al2O3 substrates, where the Al2O3 layer was a few tens of nanometers thick. According to the results, good adhesion was obtained for LDPE coating, whereas the other coatings showed a considerable lack of adhesion. Presumably, the oxidation faced by LDPE in the air gap of the extrusion-coating process was able to create an extensive number of reactive sites that strongly bonded with the hydroxyl groups on the oxide surface of the substrate. With the PET and PLA coatings, such oxidation did not occur and the adhesion obtained remained at a relatively poor level. With all of the coatings, the adhesion levels were improved using corona discharge equipment as a pretreatment prior to the extrusion-coating process.