scholarly journals Potential of polyhydroxyalkanoate (PHA) polymers family as substitutes of petroleum based polymers for packaging applications and solutions brought by their composites to form barrier materials

2017 ◽  
Vol 89 (12) ◽  
pp. 1841-1848 ◽  
Author(s):  
Gülsah Keskin ◽  
Gülnur Kızıl ◽  
Mikhael Bechelany ◽  
Céline Pochat-Bohatier ◽  
Mualla Öner
Keyword(s):  
Environmental Pollution ◽  
Degradation Products ◽  
Barrier Properties ◽  
Synthetic Polymers ◽  
Ecological Systems ◽  
Short Term ◽  
Gas Barrier ◽  
Barrier Materials ◽  
Potential Applications ◽  
Gas Barrier Properties

Abstract Today, there is an increasing concern about protection of ecological systems. Petro-based synthetic polymers are not biodegradable and cause environmental pollution. These polymers that are stuck in nature, affect wildlife adversely. Also, in future petrochemical materials will drain away and demand for eco-friendly plastics which can substitute synthetic plastics will increase. Biopolymers are products which can be degraded by enzymatic activities of various microorganisms, and the degradation products are nontoxic. They are attractive alternatives to non-degradable materials in short-term applications such as packaging. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a member of polyhydroxyalkanoate (PHA) family which is biodegradable and produced by microorganism. It has good gas barrier properties that make it convenient to use in different applications. The present paper gives an overview on PHAs and their composites, their main properties, with a specific focus on potential applications of PHBV in packaging.

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

Facile construction of cellulose/montmorillonite nanocomposite biobased plastics with flame retardant and gas barrier properties

Cellulose ◽  
2015 ◽  
Vol 22 (6) ◽  
pp. 3799-3810 ◽  
Author(s):  
Qiyang Wang ◽  
Jinghua Guo ◽  
Dingfeng Xu ◽  
Jie Cai ◽  
Yongtao Qiu ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Gas Barrier Properties
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