Viscoelastic Properties of Supramolecular Soft Materials with Transient Polymer Network
Viscoelastic Properties of Supramolecular Soft Materials with Transient Polymer Network
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DOI：
10.1002/polb.23479
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发表时间：
2014-06-01
影响因子：
--
通讯作者：
Matsushita, Yushu
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文献类型：
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作者：
Hayashi, Mikihiro;Noro, Atsushi;Matsushita, Yushu
通过共混端羧基聚丙烯酸乙酯(PEA-(COOH)(2))和聚乙烯亚胺(PEI)制备了一系列具有氢键瞬态网络的超分子软材料。通过流变学和小角 X 射线散射测量研究了 PEA-(COOH)(2) 分子量 (M-PEA) 和共混比例对粘弹性性能的影响。添加 PEI 后，由于 PEI 上的胺和 PEA-(COOH)(2) 上的羧酸之间形成离子氢键交联网络，出现了橡胶状平台。在胺与羧酸的一定摩尔比下，获得了储能模量-损失模量交叉的最高温度以及最高的流动活化能，与M-PEA无关，表明通过两个官能团的化学计量平衡实现了优化的超分子网络。由于遥爪 PEA-(COOH)(2) 作为网络链，平台模量与 M-PEA 成反比，这与 X 射线散射测量估计的交联之间的相关长度一致。 (c) 2014 年 Wiley periodicals, Inc. J. Polym。科学，B 部分：聚合物。物理。 2014, 52, 755-764
A series of supramolecular soft materials with hydrogen bonded transient networks was prepared by blending carboxy-terminated telechelic poly(ethyl acrylate) (PEA-(COOH)(2)) and polyethyleneimine (PEI). Effects of PEA-(COOH)(2) molecular weight (M-PEA) and the blend ratio on the viscoelastic properties were investigated by rheological and small angle X-ray scattering measurements. Rubbery plateau appeared by adding PEI due to network formation with ionic hydrogen bonded crosslinks between amines on PEI and carboxylic acids on PEA-(COOH)(2). The highest temperature of a storage modulus-loss modulus crossover as well as the highest flow activation energy was attained at a certain mole ratio of amines to carboxylic acids, irrelevant to M-PEA, indicating optimized supramolecular networks were achieved by stoichiometric balance of two functional groups. Since telechelic PEA-(COOH)(2) serves as a network strand, the plateau modulus was inversely proportional to M-PEA, which was consistent with the correlation length between crosslinks estimated by X-ray scattering measurements. (c) 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 755-764