Confined crystallization and melting behaviors of poly(ethylene glycol) end‐functionalized by hydrogen bonding groups: Effect of contents for functional units

2020 ◽  
Vol 3 (5) ◽  
Author(s):  
Xiang Li ◽  
Xiaolei Dong ◽  
Jiale Zhou ◽  
Jianna Bao ◽  
Shichang Chen ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Confined Crystallization ◽  
Functional Units ◽  
Poly Ethylene

The role of hydrogen bonding in alginate/poly(acrylamide-co-dimethylacrylamide) and alginate/poly(ethylene glycol) methyl ether methacrylate-based tough hybrid hydrogels

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57678-57685 ◽  
Author(s):  
Zhi Wei Low ◽  
Pei Lin Chee ◽  
Dan Kai ◽  
Xian Jun Loh
Keyword(s):  
Hydrogen Bonding ◽  
Elastic Modulus ◽  
Ethylene Glycol ◽  
Methyl Ether ◽  
Poly Ethylene Glycol ◽  
Hybrid Hydrogels ◽  
Poly Ethylene ◽  
Glycol Methyl Ether ◽  
Poly Acrylamide

Hybrid hydrogels, with an elastic modulus and compressive toughness of 350 kPa and 70 J m−3, was synthesized and reported here.

scholarly journals Chain-End Effects on Supramolecular Poly (Ethylene Glycol) Polymers

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2235
Author(s):  
Ana Brás ◽  
Ana Arizaga ◽  
Uxue Agirre ◽  
Marie Dorau ◽  
Judith Houston ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Relaxation Time ◽  
Ethylene Glycol ◽  
Interaction Parameter ◽  
Path Model ◽  
Poly Ethylene Glycol ◽  
Scanning Calorimetry ◽  
End Effects ◽  
Structure And Dynamics ◽  
Poly Ethylene

In this work we present a fundamental analysis based on small-angle scattering, linear rheology and differential scanning calorimetry (DSC) experiments of the role of different hydrogen bonding (H-bonding) types on the structure and dynamics of chain-end modified poly(ethylene glycol) (PEG) in bulk. As such bifunctional PEG with a molar mass below the entanglement mass Me is symmetrically end-functionalized with three different hydrogen bonding (H-bonding) groups: thymine-1-acetic acid (thy), diamino-triazine (dat) and 2-ureido-4[1H]-pyrimidinone (upy). A linear block copolymer structure and a Newtonian-like dynamics is observed for PEG-thy/dat while results for PEG-upy structure and dynamics reveal a sphere and a network-like behavior, respectively. These observations are concomitant with an increase of the Flory–Huggins interaction parameter from PEG-thy/dat to PEG-upy that is used to quantify the difference between the H-bonding types. The upy association into spherical clusters is established by the Percus–Yevick approximation that models the inter-particle structure factor for PEG-upy. Moreover, the viscosity study reveals for PEG-upy a shear thickening behavior interpreted in terms of the free path model and related to the time for PEG-upy to dissociate from the upy clusters, seen as virtual crosslinks of the formed network. Moreover, a second relaxation time of different nature is also obtained from the complex shear modulus measurements of PEG-upy by the inverse of the angular frequency where G’ and G’’ crosses from the network-like to glass-like transition relaxation time, which is related to the segmental friction of PEG-upy polymeric network strands. In fact, not only do PEG-thy/dat and PEG-upy have different viscoelastic properties, but the relaxation times found for PEG-upy are much slower than the ones for PEG-thy/dat. However, the activation energy related to the association dynamics is very similar for both PEG-thy/dat and PEG-upy. Concerning the segmental dynamics, the glass transition temperature obtained from both rheological and calorimetric analysis is similar and increases for PEG-upy while for PEG-thy/dat is almost independent of association behavior. Our results show how supramolecular PEG properties vary by modifying the H-bonding association type and changing the molecular Flory–Huggins interaction parameter, which can be further explored for possible applications.

Catechin solubilization by spontaneous hydrogen bonding with poly(ethylene glycol) for dry eye therapeutics

2019 ◽  
Vol 307 ◽  
pp. 413-422 ◽  
Author(s):  
Whuisu Shim ◽  
Chae Eun Kim ◽  
Mihyun Lee ◽  
Soo Hyeon Lee ◽  
Joseph Park ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Ethylene Glycol ◽  
Dry Eye ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene
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