Effect of chain extrender on the compatibility, mechanical and gas barrier properties of poly(butylene adipate‐co‐terephthalate)/poly(propylene carbonate) bio‐composites

2021 ◽  
Vol 138 (21) ◽  
pp. 50487
Author(s):  
Yang Zhao ◽  
Yuan Li ◽  
Dong Xie ◽  
Junjia Chen
Keyword(s):  
Propylene Carbonate ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Poly Propylene ◽  
Gas Barrier Properties

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.

Influence of asymmetric substituent group 2-methyl-1,3-propanediol on bio-based poly(propylene furandicarboxylate) copolyesters

Soft Matter ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 402-410 ◽  
Author(s):  
Zhi-Yu Yang ◽  
Chin-Wen Chen ◽  
Syang-Peng Rwei
Keyword(s):  
Free Volume ◽  
Molecular Motion ◽  
Barrier Properties ◽  
Small Scale ◽  
Gas Barrier ◽  
Methyl Group ◽  
Substituent Group ◽  
Group 2 ◽  
Poly Propylene ◽  
Gas Barrier Properties

The effect of the pendant methyl group weakens gas barrier properties owing to small-scale molecular motion and an increase of free volume. These novel copolyesters have great potential for packing-related applications.

Structure and Gas Barrier Properties of Poly(propylene-graft-maleic anhydride)/Phosphate Glass Composites Prepared by Microlayer Coextrusion

2010 ◽  
Vol 43 (9) ◽  
pp. 4230-4239 ◽  
Author(s):  
Mohit Gupta ◽  
Yijian Lin ◽  
Taneisha Deans ◽  
Eric Baer ◽  
Anne Hiltner ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Phosphate Glass ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Glass Composites ◽  
Poly Propylene ◽  
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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