Comparison of the mechanical properties of styrene‐based ionomers containing either crown ether or pentaethylene glycol with those of underneutralized ionomers

Dynamic mechanical properties of styrene‐based ionomers containing varying amounts of either 15‐crown‐5 ether (CE) or pentaethylene glycol (PG) are compared with those of ionomers of varying degree of neutralization (ND). The cluster Tg (Tg,c) and ionic modulus of the ionomers decrease with increasi...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2015-10, Vol.53 (19), p.1358-1367
Main Authors: Park, Hye‐Ryeon, Kim, Eunhee, Lee, Bum‐Kyu, Yu, Jeong‐A, Kim, Young‐Wun, Kim, Joon‐Seop
Format: Article
Language:English
Subjects:
Carboxylic acids
Crown ethers
electrostatic interactions
Electrostatics
glass transition
Glycols
hydrogen bonding
Hydrogen bonds
Ion pairs
Ionomers
mechanical properties
morphology
neutralization
Plasticizers
polymers
polystyrene
sodium
X-radiation
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Summary:Dynamic mechanical properties of styrene‐based ionomers containing varying amounts of either 15‐crown‐5 ether (CE) or pentaethylene glycol (PG) are compared with those of ionomers of varying degree of neutralization (ND). The cluster Tg (Tg,c) and ionic modulus of the ionomers decrease with increasing amount of CE or PG or decreasing ND. Thus, we propose that the CE binds Na⁺ strongly to form a large‐sized complex. Thus, the electrostatic interactions between charges decrease, leading to lower Tg,c. For the PG‐containing ionomers, the PG acts as polar plasticizer, further lowing the Tg,c. In the case of the underneutralized ionomers, the Tg,c is reduced by the existence of both relatively weak hydrogen bonds between carboxylic acid groups and relatively strong ionic bonds between ion pairs in the multiplets. The small‐angle X‐ray scattering results are also supportive of the above interpretations. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 1358–1367
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.23772