Nonlinear Rheology of Telechelic Ionomers Based on Sodium Sulfonate and Carboxylate
Nonlinear Rheology of Telechelic Ionomers Based on Sodium Sulfonate and Carboxylate
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基于磺酸钠和羧酸盐的遥爪离聚物的非线性流变学
DOI：
10.1021/acs.macromol.1c01350
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发表时间：
2021-10
期刊：
影响因子：
5.5
通讯作者：
Watanabe Hiroshi
中科院分区：
文献类型：
--
作者：
Liu Shuang;Zhang Zhijie;Chen Quan;Matsumiya Yumi;Watanabe Hiroshi
在这项研究中，我们研究了基于羧酸钠或磺酸钠基团的无缠结遥螺旋离聚体的结构、线性粘弹性(LVE)和非线性剪切和伸长性能，编码为Mn-Coona和Mn-SO3Na，其数平均分子量从5到16 Kgmol-1变化。X射线散射和LVE数据相结合表明，这两种类型的离聚体形成由盐聚集体瞬时交联的“超桥”支撑的网络。结果表明，聚集体在Mn-SO3Na离聚体中比在Mn-Coona离聚体中更稳定。此外，X射线散射和LVE数据表明，在Mn-SO3Na中，超桥的内聚体和端聚体是均匀稳定的，而在Mn-Coona中，端聚体更稳定。这两个系列离聚体聚集体稳定性的差异对非线性流变学有显著的影响，即在Weissenberg数为Wi>；1的剪切或拉伸场中，与Mn-SO3Na相比，Mn-Coona在应力超调上显示出更大的应变。这一结果表明，在超调之前，Mn-Coona离聚体能更好地调节流动下的网络。超调后，Mn-Coona获得了较弱的伪屈服应变和较高的断裂应变，这表明Mn-Coona的伴生网络更容易重建。所有这些特征都归因于Mn-Coona的盐团聚体尺寸和超桥长度的不均匀分布，这使得在强流下通过网络的快速重排能够更有效地耗散能量。
In this study, we examined the structure, linear viscoelastic (LVE) properties, and nonlinear shear and elongational properties of unentangled telechelic ionomers based on either sodium carboxylate or sodium sulfonate groups, coded asMn-COONa andMn-SO3Na, with the number-average molecular weightMnvarying from 5 to 16 kg mol–1. A combination of X-ray scattering and LVE data revealed that both types of ionomers form networks sustained by “superbridges” transiently cross-linked by salt aggregates. The aggregates were found to be more stabilized in theMn-SO3Na ionomers than in theMn-COONa ionomers. In addition, the X-ray scattering and LVE data suggested that the inner and end aggregates of the superbridge are equally stabilized inMn-SO3Na, while the end aggregates are more stable inMn-COONa. This difference in the aggregate stability in the two series of ionomers was found to have a significant effect on nonlinear rheology; namely, under the shear or elongational flow fields with the Weissenberg numberWi> 1,Mn-COONa showed a larger strain on the stress overshoot compared toMn-SO3Na. This result suggested that theMn-COONa ionomers can better adjust the network under flow before the overshoot. After the overshoot, the weaker pseudo-yielding and higher fracture strains were attained forMn-COONa, suggesting that the associated network can be reconstructed more easily forMn-COONa. All these features are attributable to a nonuniform distribution of the salt aggregate size and superbridge length ofMn-COONa, which enables more efficient energy dissipation under strong flow through fast rearrangement of the network.
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影响因子：
1.3
作者：
H. Watanabe;Yumi Matsumiya
通讯作者：
H. Watanabe;Yumi Matsumiya
影响因子：
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通讯作者：
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通讯作者：
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通讯作者：
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