scholarly journals Poly(propylene 2,5-thiophenedicarboxylate) vs. Poly(propylene 2,5-furandicarboxylate): Two Examples of High Gas Barrier Bio-Based Polyesters

Polymers ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 785 ◽  
Author(s):  
Giulia Guidotti ◽  
Michelina Soccio ◽  
Nadia Lotti ◽  
Massimo Gazzano ◽  
Valentina Siracusa ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Co2 Gas ◽  
Synthetic Strategy ◽  
Different Temperatures ◽  
Points Of View ◽  
Poly Propylene ◽  
Better Than

Both academia and industry are currently devoting many efforts to develop high gas barrier bioplastics as substitutes of traditional fossil-based polymers. In this view, this contribution presents a new biobased aromatic polyester, i.e., poly(propylene 2,5-thiophenedicarboxylate) (PPTF), which has been compared with the furan-based counterpart (PPF). Both biopolyesters have been characterized from the molecular, thermo-mechanical and structural points of view. Gas permeability behavior has been evaluated with respect to 100% oxygen, carbon dioxide and nitrogen at 23 °C. In case of CO2 gas test, gas transmission rate has been also measured at different temperatures. The permeability behavior at different relative humidity has been investigated for both biopolyesters, the thiophen-containing sample demonstrating to be better than the furan-containing counterpart. PPF’s permeability behavior became worse than PPTF’s with increasing RH, due to the more polar nature of the furan ring. Both biopolyesters under study are characterized by superior gas barrier performances with respect to PEF and PET. With the simple synthetic strategy adopted, the exceptional barrier properties render these new biobased polyesters interesting alternatives in the world of green and sustainable packaging materials. The different polarity and stability of heterocyclic rings was revealed to be an efficient tool to tailor the ability of crystallization, which in turn affects mechanical and barrier performances.

scholarly journals Impact of Backbone Amide Substitution at the Meta- and Para-Positions on the Gas Barrier Properties of Polyimide

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2097
Author(s):  
Qian Wen ◽  
Ao Tang ◽  
Chengliang Chen ◽  
Yiwu Liu ◽  
Chunguang Xiao ◽  
...  
Keyword(s):  
Transmission Rate ◽  
Barrier Properties ◽  
Polyimide Film ◽  
Flexible Display ◽  
Gas Barrier ◽  
Positron Annihilation Lifetime ◽  
Barrier Materials ◽  
Oxygen Transmission Rate ◽  
Display Technology ◽  
Gas Barrier Properties

This study designed and synthesised a meta-amide-substituted dianiline monomer (m-DABA) as a stereoisomer of DABA, a previously investigated para-amide-substituted dianiline monomer. This new monomer was polymerised with pyromellitic dianhydride (PMDA) to prepare a polyimide film (m-DABPI) in a process similar to that employed in a previous study. The relationship between the substitution positions on the monomer and the gas barrier properties of the polyimide film was investigated via molecular simulation, wide-angle X-ray diffraction (WXRD), and positron annihilation lifetime spectroscopy (PALS) to gain deeper insights into the gas barrier mechanism. The results showed that compared with the para-substituted DABPI, the m-DABPI exhibited better gas barrier properties, with a water vapour transmission rate (WVTR) and an oxygen transmission rate (OTR) as low as 2.8 g·m−2·d−1 and 3.3 cm3·m−2·d−1, respectively. This was because the meta-linked polyimide molecular chains were more tightly packed, leading to a smaller free volume and lower molecular chain mobility. These properties are not conducive to the permeation of small molecules into the film; thus, the gas barrier properties were improved. The findings have significant implications for the structural design of high-barrier materials and could promote the development of flexible display technology.

Gas permeability, mechanical behaviour and compostability of fully-aliphatic bio-based multiblock poly(ester urethane)s

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 55331-55342 ◽  
Author(s):  
Laura Genovese ◽  
Michelina Soccio ◽  
Matteo Gigli ◽  
Nadia Lotti ◽  
Massimo Gazzano ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Gas Permeability ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Gas Barrier Properties

Bio-based and compostable poly(ester urethane)s with tailorable mechanical and gas barrier properties designed for packaging purposes.

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.

Effects of the Processing Methods on the Gas Permeability of PLA/Sepiolite Thin Films: Solution Casting versus Thermo Compression

2014 ◽  
Vol 695 ◽  
pp. 187-190
Author(s):  
Nima Moazeni ◽  
Zurina Mohamad ◽  
Nazila Dehbari
Keyword(s):  
Thin Films ◽  
Gas Permeability ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Poly Lactic Acid ◽  
Solvent Casting ◽  
Solution Casting ◽  
Compression Method ◽  
Gas Barrier ◽  
Biodegradable Poly

A biodegradable poly-lactic acid (PLA)/Sepiolite nanocomposite films were prepared by the thermo-compression and solvent-casting methods, and barrier properties (water-vapor and gas barrier) were evaluated. By introducing sepiolite into PLA, the properties of nanocomposite films improved until a certain amount (1.5% wt). By increasing sepiolite loading, nanoparticles tented to agglomerate and gas permeability (GP) decreased. According to the results, the nanocomposite films prepared by the thermo-compression method were more brittle but strong due to the formation of more crystals; while solvent-casted films were more ductile due to the presence of solvent, which may act as a plasticizer, as evidenced by the results of the GP.

scholarly journals Influence of storage period on properties of biopolymer packaging materials and pouches

2017 ◽  
pp. 53-62 ◽  
Author(s):  
Sandra Bulut ◽  
Vera Lazic ◽  
Senka Popovic ◽  
Nevena Hromis ◽  
Danijela Suput
Keyword(s):  
Transmission Rate ◽  
Storage Period ◽  
Barrier Properties ◽  
Bilayer Film ◽  
Co2 Gas ◽  
Gas Atmosphere ◽  
Heat Seal ◽  
Seal Strength ◽  
Gas Transmission Rate

Bilayer biodegradable films based on pumpkin oil cake (PuOC) and zein, as well as pouches made from these materials, were prepared, and the changes of their mechanical, physicochemical and barrier properties were analyzed during four weeks of storage. Heat seal quality of formed pouches and composition of the gas atmosphere in the pouches were also monitored. The results showed that the bilayer film had a thickness of 300 ? 10 (?m), and no its changes were observed during the storage time. The tensile strength of the tested film increased slightly in the third week, but the elongation at break showed a decreasing trend during the whole storage period. The decreases in the moisture content, total soluble matter and swelling of the obtained film, were also observed. After one month of storage, the O2 transmission rate of tested films, increased from 27 to 64 (ml/m2 24h 1 bar), and the CO2 gas transmission rate from 147 to 188 (ml/m2 24h 1 bar). The heat seal strength of the PuOC/Zein pouches decreased during the whole storage period. The percentage of O2 in PuOC/Zein pouches increased up to 7 times during the storage period; however, the percentage of CO2 decreased up to 18 times already after one week, and then remained stable in the rest of the storage period. These results are, to a smaller extent, due to the gas transmission rate through the material, especially for CO2 , and to a greater extent, due to the low heat seal strength, which decreased through the storage period, and probably influenced the content of the gases in the pouches.

scholarly journals Effect of graphene nanoplatelets on the mechanical and gas barrier properties of woven carbon fibre/epoxy composites

2021 ◽  
Author(s):  
Xudan Yao ◽  
Thomas P. Raine ◽  
Mufeng Liu ◽  
Muzdalifah Zakaria ◽  
Ian A. Kinloch ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Oil And Gas ◽  
Hybrid Composites ◽  
Gas Permeability ◽  
Oil And Gas Industry ◽  
Barrier Properties ◽  
Graphene Nanoplatelets ◽  
Flexural Properties ◽  
Gas Barrier ◽  
Gas Barrier Properties

AbstractCarbon-fibre-reinforced polymer (CFRP) composites are promising materials for non-metallic pipe applications in the oil and gas industry owing to their high corrosion resistance, specific strength and stiffness. However, CFRP has poor gas barrier performance meaning that a liner has to be inserted. Graphene-based nanomaterials have been demonstrated to improve gas barrier properties in thermoplastic polymers, and thus, a CFRP–graphene hybrid composite could provide an alternative to lined pipes. In this work, a method combining spray coating with vacuum-assisted resin infusion was developed to fabricate CFRP hybrid composites with preferred in-plane aligned graphene nanoplatelets. Tensile and flexural properties, as well as CO2 gas permeability, were evaluated. It was illustrated that both tensile and flexural properties performed better under relatively low GNP loadings (< 0.2 vol%), while gas barrier property was significantly improved with the increasing GNP loadings which fits the Nielsen model with an effective GNP aspect ratio of 350. Graphical abstract

scholarly journals Block Copolyesters Containing 2,5-Furan and trans-1,4-Cyclohexane Subunits with Outstanding Gas Barrier Properties

2019 ◽  
Vol 20 (9) ◽  
pp. 2187 ◽  
Author(s):  
Giulia Guidotti ◽  
Laura Genovese ◽  
Michelina Soccio ◽  
Matteo Gigli ◽  
Andrea Munari ◽  
...  
Keyword(s):  
Fossil Fuels ◽  
Random Copolymer ◽  
Barrier Properties ◽  
Reactive Blending ◽  
Gas Barrier ◽  
Low Elastic Modulus ◽  
High Elongation ◽  
Copolymer Structure ◽  
Poly Propylene ◽  
Gas Barrier Properties

Biopolymers are gaining increasing importance as substitutes for plastics derived from fossil fuels, especially for packaging applications. In particular, furanoate-based polyesters appear as the most credible alternative due to their intriguing physic/mechanical and gas barrier properties. In this study, block copolyesters containing 2,5-furan and trans-1,4-cyclohexane moieties were synthesized by reactive blending, starting from the two parent homopolymers: poly(propylene furanoate) (PPF) and poly(propylene cyclohexanedicarboxylate) (PPCE). The whole range of molecular architectures, from long block to random copolymer with a fixed molar composition (1:1 of the two repeating units) was considered. Molecular, thermal, tensile, and gas barrier properties of the prepared materials were investigated and correlated to the copolymer structure. A strict dependence of the functional properties on the copolymers’ block length was found. In particular, short block copolymers, thanks to the introduction of more flexible cyclohexane-containing co-units, displayed high elongation at break and low elastic modulus, thus overcoming PPF’s intrinsic rigidity. Furthermore, the exceptionally low gas permeabilities of PPF were further improved due to the concomitant action of the two rings, both capable of acting as mesogenic groups in the presence of flexible aliphatic units, and thus responsible for the formation of 1D/2D ordered domains, which in turn impart outstanding barrier properties.

scholarly journals Polyvinyl Alcohol-Few Layer Graphene Composite Films Prepared from Aqueous Colloids. Investigations of Mechanical, Conductive and Gas Barrier Properties

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 858 ◽  
Author(s):  
Benoit Van der Schueren ◽  
Hamza El Marouazi ◽  
Anurag Mohanty ◽  
Patrick Lévêque ◽  
Christophe Sutter ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Transmission Rate ◽  
Composite Films ◽  
Barrier Properties ◽  
Water Soluble ◽  
Gas Barrier ◽  
Layer Graphene ◽  
Few Layer Graphene

Quasi all water soluble composites use graphene oxide (GO) or reduced graphene oxide (rGO) as graphene based additives despite the long and harsh conditions required for their preparation. Herein, polyvinyl alcohol (PVA) films containing few layer graphene (FLG) are prepared by the co-mixing of aqueous colloids and casting, where the FLG colloid is first obtained via an efficient, rapid, simple, and bio-compatible exfoliation method providing access to relatively large FLG flakes. The enhanced mechanical, electrical conductivity, and O2 barrier properties of the films are investigated and discussed together with the structure of the films. In four different series of the composites, the best Young’s modulus is measured for the films containing around 1% of FLG. The most significant enhancement is obtained for the series with the largest FLG sheets contrary to the elongation at break which is well improved for the series with the lowest FLG sheets. Relatively high one-side electrical conductivity and low percolation threshold are achieved when compared to GO/rGO composites (almost 10−3 S/cm for 3% of FLG and transport at 0.5% FLG), while the conductivity is affected by the formation of a macroscopic branched FLG network. The composites demonstrate a reduction of O2 transmission rate up to 60%.

Improvement of Oxidation Property of SUS304 by Gas Barrier Coating

2007 ◽  
Vol 353-358 ◽  
pp. 1879-1882 ◽  
Author(s):  
Riichi Murakami ◽  
Katsuhiro Fujikawa ◽  
Daisuke Yonekura
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Flow Rate Ratio ◽  
Gas Barrier ◽  
Corrosion Resistant ◽  
Oxygen Transmission Rate ◽  
Barrier Coating ◽  
Deposited Film

Stainless steel is widely used as a corrosion-resistant material. However, stainless steel corrodes at high temperature (573 K ~) due to the oxidization and grain boundary corrosion. To delay the oxidation at high temperature, coating of gas barrier film will be useful method. The purpose of this study is to improve the corrosion-resistant of SUS304 at high temperature by coating transparent SiOxNy film which has gas barrier properties. In addition, the influence of inlet gas mass flow rate ratio (N2/Ar+N2) on the oxidation properties at 773 K was examined. The SiOxNy films were deposited onto polished SUS304 by unbalanced dc magnetron sputtering apparatus. To examine the oxygen transmission rate (OTR) of SiOxNy films, PET was also used as substrate. The results showed that good OTR was obtained for N2/Ar+N2 < 0.12 on PET substrate. The similar tendency was obtained for SUS304 deposited film heated up to 773 K.

Sign in / Sign up

Export Citation Format

Share Document