scholarly journals Microphase separation of a quadruple hydrogen bonding supramolecular polymer: effect of the steric hindrance of the ureido-pyrimidone on their viscoelasticity

RSC Advances ◽  
2019 ◽  
Vol 9 (16) ◽  
pp. 8905-8911 ◽  
Author(s):  
Lei Kan ◽  
Peng Zhang ◽  
Hongkun Jiang ◽  
Shuai Zhang ◽  
Zhengdao Liu ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Steric Hindrance ◽  
Microphase Separation ◽  
Supramolecular Polymers ◽  
Supramolecular Polymer ◽  
Quadruple Hydrogen Bonding

The supramolecular polymers based on 2-ureido-4[1H]-pyrimidone (UPy) with different structure were prepared and the effects of microtopography on the viscoelasticity were investigated.

Photoresponsive supramolecular polymers based on quadruple hydrogen-bonding and a photochromic azobenzene motif

2018 ◽  
Vol 9 (44) ◽  
pp. 5395-5401 ◽  
Author(s):  
Shaobo Tan ◽  
Ye Sha ◽  
Tianyu Zhu ◽  
Md Anisur Rahman ◽  
Chuanbing Tang
Keyword(s):  
Hydrogen Bonding ◽  
Supramolecular Polymers ◽  
Supramolecular Polymer ◽  
Quadruple Hydrogen Bonding ◽  
Hydrogen Bonded

A photoresponsive quadruple hydrogen-bonded supramolecular polymer was constructed using photochromic azobenzene and ureidopyrimidinone motifs.

scholarly journals Quadruple Hydrogen Bond-Containing A-AB-A Triblock Copolymers: Probing the Influence of Hydrogen Bonding in the Central Block

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4705
Author(s):  
Boer Liu ◽  
Xi Chen ◽  
Glenn A. Spiering ◽  
Robert B. Moore ◽  
Timothy E. Long
Keyword(s):  
Hydrogen Bonding ◽  
Self Assembly ◽  
Microphase Separation ◽  
Triblock Copolymers ◽  
Random Copolymer ◽  
Thermomechanical Properties ◽  
Structure Property ◽  
Scanning Calorimetry ◽  
Central Block ◽  
Quadruple Hydrogen Bonding

This work reveals the influence of pendant hydrogen bonding strength and distribution on self-assembly and the resulting thermomechanical properties of A-AB-A triblock copolymers. Reversible addition-fragmentation chain transfer polymerization afforded a library of A-AB-A acrylic triblock copolymers, wherein the A unit contained cytosine acrylate (CyA) or post-functionalized ureido cytosine acrylate (UCyA) and the B unit consisted of n-butyl acrylate (nBA). Differential scanning calorimetry revealed two glass transition temperatures, suggesting microphase-separation in the A-AB-A triblock copolymers. Thermomechanical and morphological analysis revealed the effects of hydrogen bonding distribution and strength on the self-assembly and microphase-separated morphology. Dynamic mechanical analysis showed multiple tan delta (δ) transitions that correlated to chain relaxation and hydrogen bonding dissociation, further confirming the microphase-separated structure. In addition, UCyA triblock copolymers possessed an extended modulus plateau versus temperature compared to the CyA analogs due to the stronger association of quadruple hydrogen bonding. CyA triblock copolymers exhibited a cylindrical microphase-separated morphology according to small-angle X-ray scattering. In contrast, UCyA triblock copolymers lacked long-range ordering due to hydrogen bonding induced phase mixing. The incorporation of UCyA into the soft central block resulted in improved tensile strength, extensibility, and toughness compared to the AB random copolymer and A-B-A triblock copolymer comparisons. This study provides insight into the structure-property relationships of A-AB-A supramolecular triblock copolymers that result from tunable association strengths.

scholarly journals Microphase separation induced in the melt of Pluronic copolymers by blending with a hydrogen bonding urea–urethane end-capped supramolecular polymer

Soft Matter ◽  
2015 ◽  
Vol 11 (29) ◽  
pp. 5799-5803 ◽  
Author(s):  
Daniel Hermida-Merino ◽  
Gemma E. Newby ◽  
Ian W. Hamley ◽  
Wayne Hayes ◽  
Andrew Slark
Keyword(s):  
Hydrogen Bonding ◽  
Microphase Separation ◽  
Supramolecular Polymer

scholarly journals Neutral linear supramolecular polymers constructed by three different interactions

RSC Advances ◽  
2017 ◽  
Vol 7 (47) ◽  
pp. 29364-29367 ◽  
Author(s):  
Qi Wang ◽  
Peng Zhang ◽  
Yuanyuan Li ◽  
Lu Tian ◽  
Ming Cheng ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Molecular Recognition ◽  
Supramolecular Polymers ◽  
Donor Acceptor ◽  
Quadruple Hydrogen Bonding

Neutral linear supramolecular polymers were constructed by the combination of quadruple hydrogen bonding, pillar[5]arene-based molecular recognition and π–π donor–acceptor interactions.

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