Characterizing the nanoclay induced constrained amorphous region in model segmented polyurethane–urea/clay nanocomposites and its implications on gas barrier properties

2016 ◽  
Vol 18 (3) ◽  
pp. 1487-1499 ◽  
Author(s):  
Sangram K. Rath ◽  
Kathi Sudarshan ◽  
Rupesh S. Bhavsar ◽  
Ulhas K. Kharul ◽  
Pradeep K. Pujari ◽  
...  
Keyword(s):  
Barrier Properties ◽  
Amorphous Region ◽  
Clay Nanocomposites ◽  
Segmented Polyurethane ◽  
Gas Barrier ◽  
Gas Barrier Properties

AFM images of the segmented PU/clay nanocomposite with labeling of various phases.

Polymer/clay nanocomposites and their gas barrier properties

2013 ◽  
Vol 34 (9) ◽  
pp. 1418-1424 ◽  
Author(s):  
Alena Kalendova ◽  
Dagmar Merinska ◽  
Jean Francois Gerard ◽  
Miroslav Slouf
Keyword(s):  
Barrier Properties ◽  
Clay Nanocomposites ◽  
Gas Barrier ◽  
Gas Barrier Properties

Modeling Gas Barrier Property Improvements in Polymer-Clay Nano-Composites

2014 ◽  
Vol 29 ◽  
pp. 75-84 ◽  
Author(s):  
A. Al-Abduljabbar
Keyword(s):  
High Efficiency ◽  
Volume Fraction ◽  
Barrier Properties ◽  
Two Dimensions ◽  
Clay Nanocomposites ◽  
Gas Barrier ◽  
Clay Nanoparticles ◽  
Bulk Matrix ◽  
Clay Platelets ◽  
Gas Barrier Properties

Polymer-clay nanocomposites (PCNC) offer better properties at very low volume fraction of the nanofiller compared to conventional polymer composites, thus minimizing the effect on other favored properties of the polymer. The mechanism by which clay platelets, which have thicknesses of a few nanometers in size compared with several hundred nanometers in the other two dimensions, introduce mechanical and other properties improvement can be attributed to their high efficiency in introducing a discontinuity to flows through the bulk matrix polymer material. The extent of this improvement depends on the success of intercalation or separation of the clay platelets through the bulk matrix. This paper contains a general overview of polymer-clay nanocomposites in terms of properties and processing. The improvements in gas barrier properties are discussed in detail; and a model to represent the effect of introduction of nanofillers on the permeability is proposed. The model builds on previous models to explain the improvements in the gas barrier properties due to the presence of clay nanoparticles and by assuming a proper distribution of these particles.

Gas barrier properties of polymer/clay nanocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63669-63690 ◽  
Author(s):  
Yanbin Cui ◽  
S. Kumar ◽  
Balakantha Rao Kona ◽  
Daniel van Houcke
Keyword(s):  
Polymer Nanocomposites ◽  
State Of The Art ◽  
Barrier Properties ◽  
The State ◽  
Clay Nanocomposites ◽  
Gas Barrier ◽  
Gas Barrier Properties

The state-of-the-art progress on the use of clay for the gas barrier properties of polymer nanocomposites have been summarized.

Effect of clay on mechanical and gas barrier properties of blown film LDPE/clay nanocomposites

2007 ◽  
Vol 106 (4) ◽  
pp. 2210-2217 ◽  
Author(s):  
Supong Arunvisut ◽  
Sutthipat Phummanee ◽  
Anongnat Somwangthanaroj
Keyword(s):  
Barrier Properties ◽  
Clay Nanocomposites ◽  
Gas Barrier ◽  
Blown Film ◽  
Gas Barrier Properties

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
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