In situbiaxial stretching for the platelet formation of an ethylene-vinyl alcohol copolymer through multistage stretching extrusion and its effect on the gas-barrier properties of polyethylene

2013 ◽  
Vol 131 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jiaming Zhu ◽  
Jiabin Shen ◽  
Shaoyun Guo
Keyword(s):  
Vinyl Alcohol ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Ethylene Vinyl Alcohol ◽  
Ethylene Vinyl Alcohol Copolymer ◽  
Gas Barrier Properties ◽  
Platelet Formation

Tailoring morphology to improve the gas-barrier properties of thermoplastic polyurethane/ethylene-vinyl alcohol blends

2016 ◽  
Vol 56 (8) ◽  
pp. 922-931 ◽  
Author(s):  
Xiumei Gao ◽  
Dekun Sheng ◽  
Xiangdong Liu ◽  
Tongbing Li ◽  
Fance Ji ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Thermoplastic Polyurethane ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Ethylene Vinyl Alcohol ◽  
Gas Barrier Properties

scholarly journals Recent Updates on the Barrier Properties of Ethylene Vinyl Alcohol Copolymer (EVOH): A Review

2018 ◽  
Vol 58 (2) ◽  
pp. 209-246 ◽  
Author(s):  
Caroline Maes ◽  
Wout Luyten ◽  
Geert Herremans ◽  
Roos Peeters ◽  
Robert Carleer ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Barrier Properties ◽  
Ethylene Vinyl Alcohol ◽  
Ethylene Vinyl Alcohol Copolymer

Nanocomposite Films of Poly(vinyl alcohol)-Grafted Graphene Oxide/Poly(vinyl alcohol) for Gas Barrier Film Applications

2015 ◽  
Vol 15 (10) ◽  
pp. 8348-8352 ◽  
Author(s):  
Min Eui Lee ◽  
Hyoung-Joon Jin
Keyword(s):  
Graphene Oxide ◽  
Vinyl Alcohol ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Strong Interactions ◽  
Poly Vinyl Alcohol ◽  
Gas Barrier ◽  
Oxygen Transmission Rate ◽  
Gas Barrier Properties

Poly(vinyl alcohol) (PVA) composites containing graphene oxide (GO) functionalized with PVA were synthesized via the esterification of the carboxylic groups of GO. The presence of PVA-grafted GO (PVA-g-GO) in the PVA matrix induced strong interactions between the chains of the PVA matrix and allowed the PVA-g-GO to be uniformly dispersed throughout the matrix. The grafting of PVA to GO increased the gas barrier properties of the GO/PVA composites because of the increased compatibility between GO and PVA. The PVA-g-GO/PVA composites were used to coat the surface of poly(ethylene terephthalate) films. These coated films exhibited excellent gas barrier properties; the film containing 0.3 wt% of PVA-g-GO had an oxygen transmission rate (OTR) of 0.025 cc/(m2 · day) and an optical transmittance of 83.8%. As a result, PVA-g-GO/PVA composites that exhibited enhanced gas barrier properties were prepared with a solution mixing method.

scholarly journals Design of Novel PLA/OMMT Films with Improved Gas Barrier and Mechanical Properties by Intercalating OMMT Interlayer with High Gas Barrier Polymers

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3962
Author(s):  
Abdul Shakoor Shar ◽  
Caili Zhang ◽  
Xieqing Song ◽  
Yunxuan Weng ◽  
Qiuyue Du
Keyword(s):  
Mechanical Properties ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Barrier Properties ◽  
Poly Vinyl Alcohol ◽  
Diffraction Measurement ◽  
Scanning Calorimetry ◽  
Gas Barrier ◽  
Ethylene Vinyl Alcohol ◽  
Barrier Polymers

Polymer/clay composites are an innovative class of materials. In this study, we present a facile method for the preparation of biodegradable and robust PLA/organomodified montmorillonite (OMMT) composite films with excellent gas barrier performance. When the design of PLA/OMMT composite films, in addition to making OMMT have good intercalation effect in the matrix, the compatibility of intercalating polymer and matrix should also be considered. In this work, two polymers with high gas barrier properties, namely poly(vinyl alcohol) (PVA) and ethylene vinyl alcohol copolymer (EVOH), were selected to intercalate OMMT. The morphology and microstructures of the prepared PLA/PVA/OMMT and PLA/EVOH/OMMT composites were characterized by the X-ray diffraction measurement, scanning electron microscopy, and differential scanning calorimetry. It was shown that the good dispersibility of PVA in the PLA matrix, rather than the intercalation effect, was responsible for the improved gas barrier and mechanical properties of PLA/PVA/OMMT composite. The elongation at break increases from 4.5% to 22.7% when 1 wt % PVA is added to PLA/OMMT. Moreover, gas barrier of PLA/PVA1/OMMT measured as O2 permeability is 52.8% higher than that of neat PLA. This work provides a route to intercalate OMMT interlayer with high gas barrier polymers and thus can be a useful reference to fabricate PLA/OMMT composites with improved gas barrier and mechanical properties. A comparison of oxygen permeabilities with existing commercial packaging films indicates that the biodegradable PLA/PVA/OMMT may serve as a viable substitute for packaging film applications.

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