Synthesis of urea-containing ABA triblock copolymers: Influence of pendant hydrogen bonding on morphology and thermomechanical properties

2018 ◽  
Vol 56 (16) ◽  
pp. 1844-1852
Author(s):  
Mingtao Chen ◽  
David L. Inglefield ◽  
Keren Zhang ◽  
Amanda G. Hudson ◽  
Samantha J. Talley ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Triblock Copolymers ◽  
Thermomechanical Properties

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.

Hydrogen-Bonding Mediated Self-Assembly of Amphiphilic ABA Triblock Copolymers into Well-Defined Giant Vesicles

2021 ◽  
Author(s):  
Huiying Wang ◽  
Qiang Chen ◽  
Zhen Geng ◽  
Jingyi Rao ◽  
Bijin Xiong ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Giant Vesicles

Giant vesicles represent an extremely useful system to mimick biomembranes; however, available methodologies towards easy and direct vesicles construction are still scarce. By designing a hydrogen-bonding (H-bonding) amphiphilic ABA triblock...

Multiple Hydrogen Bonding for the Noncovalent Attachment of Ionic Functionality in Triblock Copolymers

2007 ◽  
Vol 40 (13) ◽  
pp. 4396-4398 ◽  
Author(s):  
Brian D. Mather ◽  
Margaux B. Baker ◽  
Frederick L. Beyer ◽  
Matthew D. Green ◽  
Michael A. G. Berg ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Triblock Copolymers ◽  
Multiple Hydrogen Bonding

scholarly journals Self-Complementary Multiple Hydrogen-Bonding Additives Enhance Thermomechanical Properties of 3D-Printed PMMA Structures

2019 ◽  
Vol 52 (15) ◽  
pp. 5574-5582 ◽  
Author(s):  
Dayton P. Street ◽  
William K. Ledford ◽  
Abigail A. Allison ◽  
Steven Patterson ◽  
Deanna L. Pickel ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Thermomechanical Properties ◽  
3D Printed ◽  
Multiple Hydrogen Bonding
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