Tuning the Johari-Goldstein <italic style="font-style: italic">β</italic>-Relaxation and Its Separation from <italic style="font-style: italic">α</italic>-Relaxation of Poly(<italic style="font-style: italic">n</italic>-alkyl methacrylate)s by Small Molecule-bridged Hydrogen Bonds

Yuan-Biao Liu; Gao-Peng Shi; Guo-Zhang Wu

doi:10.1007/s10118-021-2595-y

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Tuning the Johari-Goldstein β-Relaxation and Its Separation from α-Relaxation of Poly(n-alkyl methacrylate)s by Small Molecule-bridged Hydrogen Bonds

ARTICLE | Updated：2021-07-05

- Tuning the Johari-Goldstein β-Relaxation and Its Separation from α-Relaxation of Poly(n-alkyl methacrylate)s by Small Molecule-bridged Hydrogen Bonds
- Chinese Journal of Polymer Science Vol. 39, Issue 11, Pages: 1459-1469(2021)
- Affiliations：
  
  Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, China
- Author bio：
  
  wgz@ecust.edu.cn
- Funds：
- DOI：10.1007/s10118-021-2595-y
  CLC：
- Received：07 February 2021，
  
  Revised：2021-4-10，
  
  Accepted：20 April 2021，
  
  Online First：05 July 2021，
  
  Published：18 September 2021
- Accepted：
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Liu, Y. B.; Shi, G. P.; Wu, G. Z. Tuning the Johari-Goldstein β-relaxation and its separation from α-relaxation of poly(n-alkyl methacrylate)s by small molecule-bridged hydrogen bonds. Chinese J. Polym. Sci. 2021, 39, 1459–1469

Yuan-Biao Liu, Gao-Peng Shi, Guo-Zhang Wu. Tuning the Johari-Goldstein β-Relaxation and Its Separation from α-Relaxation of Poly(n-alkyl methacrylate)s by Small Molecule-bridged Hydrogen Bonds[J]. Chinese Journal of Polymer Science, 2021, 39(11): 1459-1469. DOI: 10.1007/s10118-021-2595-y.
Liu, Y. B.; Shi, G. P.; Wu, G. Z. Tuning the Johari-Goldstein β-relaxation and its separation from α-relaxation of poly(n-alkyl methacrylate)s by small molecule-bridged hydrogen bonds. Chinese J. Polym. Sci. 2021, 39, 1459–1469 DOI： 10.1007/s10118-021-2595-y.

Yuan-Biao Liu, Gao-Peng Shi, Guo-Zhang Wu. Tuning the Johari-Goldstein β-Relaxation and Its Separation from α-Relaxation of Poly(n-alkyl methacrylate)s by Small Molecule-bridged Hydrogen Bonds[J]. Chinese Journal of Polymer Science, 2021, 39(11): 1459-1469. DOI: 10.1007/s10118-021-2595-y. DOI：

摘要

Abstract

Introducing small molecule-bridged hydrogen bonds (HBs) between polymer chains has been reported to effectively reduce the inter-chain cooperativity despite of strengthening the intermolecular interaction. Here

a systematic investigation on tuning the Johari-Goldstein

(

) relaxation by adding various low-molecular-weight phenols in poly(

-alkyl methacrylate)s is carried out to further clarify the anomalous dynamics. Given these small molecules capable of coupling the motion with pendent groups of host polymers due to forming at least two HBs per molecule

poly(

-alkyl methacrylate) mixtures exhibit rich dynamic changes in the

-properties and

separations. An increased loading of phenols with a small size and strong inter-HB strength (Δ

) clearly benefits for significant retardation and suppression of the

-relaxation

narrows the

separation and converges the

-peak with the

-peak

which demonstrates the alleviation of inter-chain topological constraints. However

small molecules with a relatively big size and weak Δ

are found to amplify the magnitude of the

separation of poly(butyl methacrylate)

even though experimental results of changes in

-dispersion and dynamic fragility confirm a reduction of the coupling factor

in all of these hybrids. The counterintuitive phenomenon suggests that the crossover time

in the Coupling Model is no longer a universal quantity if the inter-chain interaction of polymers is strengthened by HBs. These compelling findings shed vital insights into the HB-induced anomalous dynamics

and provide essential guidance for tailoring the

behavior and designing glassy polymeric materials.

关键词

Keywords

references

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⁰

Tuning the Johari-Goldstein β-Relaxation and Its Separation from α-Relaxation of Poly(n-alkyl methacrylate)s by Small Molecule-bridged Hydrogen Bonds

DOI：10.1007/s10118-021-2595-y

摘要

Abstract

关键词

Keywords

references