AI Article Synopsis
- This study investigates how the strength and distribution of pendant hydrogen bonds affect the self-assembly and properties of A-AB-A triblock copolymers.
- Using reversible addition-fragmentation chain transfer polymerization, researchers created a variety of these copolymers, incorporating cytosine-based units to study their thermomechanical behavior.
- Results indicated that variations in hydrogen bonding significantly influence microphase separation and mechanical properties, with stronger associations in the UCyA version leading to improved material performance compared to CyA.
Article Abstract
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 -butyl acrylate (BA). 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8348091 | PMC |
| http://dx.doi.org/10.3390/molecules26154705 | DOI Listing |
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