scholarly journals Preparation and gas barrier properties of organic–inorganic hybrid gas barrier membranes using 3-glycidoxypropyl silsesquioxane

2020 ◽  
Vol 128 (4) ◽  
pp. 229-232
Author(s):  
Koji KURAOKA ◽  
Yuta SHIMMEN ◽  
Hidetoshi KATO ◽  
Hiroyasu SEKI ◽  
Takeshi NISHIKAWA
Keyword(s):  
Barrier Properties ◽  
Gas Barrier ◽  
Inorganic Hybrid ◽  
Barrier Membranes ◽  
Gas Barrier Properties

Advanced Organic-inorganic Hybrid Coatings Having Both High Gas Barrier Properties and Abrasion Resistance

2006 ◽  
Vol 951 ◽  
Author(s):  
Katsunori Nishiura ◽  
Toshihiko Takaki ◽  
Makoto Nakaura
Keyword(s):  
Polymer Films ◽  
Abrasion Resistance ◽  
Sol Gel ◽  
Barrier Properties ◽  
Silica Content ◽  
Hybrid Coatings ◽  
Gas Barrier ◽  
Inorganic Hybrid ◽  
Gas Barrier Properties ◽  
Silica Hybrid

ABSTRACTIt is important to develop flexible transparent polymer films having high gas barrier properties and abrasion resistance because new applications involving transparent polymer films for flat panel displays require these properties. We report on organic-inorganic hybrid coatings of polyvinylalcohol (PVA)/polyacrylicacid (PAA)-silica, which have high gas barrier properties almost equivalent to those achieved by the dry coating process. The hybrid coatings were prepared by the sol-gel reaction of alkoxysilane in a PVA/PAA aqueous solution. In order to obtain transparent coating films, 3-aminopropyltrimethoxysilane (APTMOS) was used as a compatibilizer in the sol-gel reaction of tetramethoxysilane (TMOS). No structure could be seen in the TEM of the cross-sectional coating layer, indicating that polymers and silica were mixed homogeneously. PVA/PAA-silica hybrid coatings were shown to have excellent abrasion resistance based on the ΔHaze index. O2 permeability of PVA/PAA-silica hybrid coatings evaluated by MOCON under the conditions of 23°C, 90% RH was lower than that of PVA/PAA polymer coating, which suggests that silica affects the barrier property of the hybrid coating in humid conditions. Furthermore, O2 permeability decreased as silica content increased in the coatings. Unexpectedly, high gas barrier properties appeared when the silica content exceeded 50 wt%. From the result of element distribution analysis measured by EF-TEM, it was confirmed that phase separation occurred between PVA/PAA and silica on a nanometer scale and silica forms continuous structures, which are considered to suppress O2 permeability.

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.

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

Structure, gas-barrier properties and overall migration of poly(lactic acid) films coated with hydrogenated amorphous carbon layers

Carbon ◽  
2013 ◽  
Vol 63 ◽  
pp. 274-282 ◽  
Author(s):  
S. Mattioli ◽  
M. Peltzer ◽  
E. Fortunati ◽  
I. Armentano ◽  
A. Jiménez ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Amorphous Carbon ◽  
Barrier Properties ◽  
Poly Lactic Acid ◽  
Gas Barrier ◽  
Hydrogenated Amorphous Carbon ◽  
Hydrogenated Amorphous ◽  
Gas Barrier Properties
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