Structure and Properties of Sulfonated Pentablock Terpolymer Films as a Function of Wet–Dry Cycles,Macromolecules

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Structure and Properties of Sulfonated Pentablock Terpolymer Films as a Function of Wet–Dry Cycles
Macromolecules ( IF 5.1 ) Pub Date : 2018-03-06 00:00:00 , DOI: 10.1021/acs.macromol.8b00194
Phuc V. Truong , Stacy Shingleton ₁ , Mejdi Kammoun , Rephayah L. Black ₂ , Marc Charendoff ₁ , Carl Willis ₁ , Haleh Ardebili , Gila E. Stein ₂

Affiliation

The structure and properties of poly(tert-butylstyrene-b-hydrogenated isoprene-b-sulfonated styrene-b-hydrogenated isoprene-b-tert-butylstyrene) (tBS-HI-SS-HI-tBS) films were investigated as a function of “wet–dry cycles”, where one “cycle” is defined as a 24 h soak in deionized water followed by a 24 h drying period in air. Films were characterized with a variety of complementary measurements that include X-ray scattering, infrared spectroscopy, water uptake, impedance spectroscopy, and tensile tests. We find that cycling drives a structural transition toward increasingly interconnected SS domains, which is favorable for water and ion transport. However, cycling can also induce mechanical deformations that reduce ductility, swelling, and water uptake. The significance of this trade-off is illustrated by comparing the properties for two film thicknesses as a function of cycle number: The ductility of thinner films (15 μm) is lost after four cycles, an effect that is correlated with the appearance of macroscale buckles, and the extent of swelling is also reduced. Therefore, the transport properties reflect a balance between the increased SS domain interactions and reduced water content. The ductility in thick films (30 μm) also declines with cycling, but to a lesser extent, and these systems retain their ability to swell through six cycles. Therefore, the transition to a network-like SS structure enhances both water uptake and transport. These systematic studies demonstrate that successive wet–dry cycles can lead to complex changes in the performance of amphiphilic block copolymer films, which may complicate their design for applications in water treatment or proton-conducting layers in electrochemical devices.

中文翻译：

磺化五嵌段嵌段共聚物薄膜的结构和性能随干循环的变化

聚（叔丁基苯乙烯-b-氢化异戊二烯-b-磺化苯乙烯-b-氢化异戊二烯-b-叔-研究了丁基苯乙烯薄膜（tBS-HI-SS-HI-tBS）与“干湿循环”的关系，其中一个“循环”定义为在去离子水中浸泡24小时，然后在去离子水中浸泡24小时。空气。通过各种补充测量对薄膜进行表征，这些补充测量包括X射线散射，红外光谱，吸水率，阻抗光谱和拉伸试验。我们发现，循环驱动结构朝着越来越相互联系的SS域的结构转变，这对水和离子的传输是有利的。但是，循环还会导致机械变形，从而降低延展性，膨胀和吸水率。通过比较两种薄膜厚度随循环次数变化的特性，可以说明这种折衷的意义：四个循环后，较薄的薄膜（15μm）的延展性降低，该效果与宏观带扣的出现有关，并且膨胀的程度也降低了。因此，运输性质反映了增加的SS结构域相互作用和减少的水含量之间的平衡。厚膜（30μm）的延展性也会随循环而下降，但程度较小，并且这些系统保留了在六个循环中膨胀的能力。因此，向网络状SS结构的过渡增强了水的吸收和运输。这些系统的研究表明，连续的干湿循环会导致两亲性嵌段共聚物薄膜性能的复杂变化，这可能使其在水处理或电化学装置中质子传导层中的应用变得复杂。肿胀程度也降低了。因此，运输性质反映了增加的SS结构域相互作用和减少的水含量之间的平衡。厚膜（30μm）的延展性也会随循环而下降，但程度较小，并且这些系统保留了在六个循环中膨胀的能力。因此，向网络状SS结构的过渡增强了水的吸收和运输。这些系统的研究表明，连续的干湿循环会导致两亲性嵌段共聚物薄膜性能的复杂变化，这可能使其在水处理或电化学装置中质子传导层中的应用变得复杂。肿胀程度也降低了。因此，运输性质反映了增加的SS结构域相互作用和减少的水含量之间的平衡。厚膜（30μm）的延展性也会随循环而下降，但程度较小，并且这些系统保留了在六个循环中膨胀的能力。因此，向网络状SS结构的过渡增强了水的吸收和运输。这些系统的研究表明，连续的干湿循环会导致两亲性嵌段共聚物薄膜性能的复杂变化，这可能使其在水处理或电化学装置中质子传导层中的应用变得复杂。厚膜（30μm）的延展性也会随循环而下降，但程度较小，并且这些系统保留了在六个循环中膨胀的能力。因此，向网络状SS结构的过渡增强了水的吸收和运输。这些系统的研究表明，连续的干湿循环会导致两亲性嵌段共聚物薄膜性能的复杂变化，这可能使其在水处理或电化学装置中质子传导层中的应用变得复杂。厚膜（30μm）的延展性也会随循环而下降，但程度较小，并且这些系统保留了在六个循环中膨胀的能力。因此，向网络状SS结构的过渡增强了水的吸收和运输。这些系统的研究表明，连续的干湿循环会导致两亲嵌段共聚物薄膜性能的复杂变化，这可能使其在水处理或电化学装置中质子传导层中的应用变得复杂。

更新日期：2018-03-06

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