Viscoelastic properties of supramolecular soft materials with transient polymer network |
| |
| Authors: | Mikihiro Hayashi Atsushi Noro Yushu Matsushita |
| |
| Affiliation: | Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, , Chikusa‐ku, Nagoya, 464–8603 Japan |
| |
| Abstract: | 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 (MPEA) 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 MPEA, 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 MPEA, which was consistent with the correlation length between crosslinks estimated by X‐ray scattering measurements. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014 , 52, 755–764 |
| |
| Keywords: | hydrogen bonding rheology supramolecular soft materials transient network X‐ray scattering |
|
|
