scholarly journals Selective Transport through Membranes with Charged Nanochannels Formed by Scalable Self-Assembly of Random Copolymer Micelles

ACS Nano ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. 95-108 ◽  
Author(s):  
Ilin Sadeghi ◽  
Jacob Kronenberg ◽  
Ayse Asatekin
Keyword(s):  
Self Assembly ◽  
Random Copolymer ◽  
Selective Transport ◽  
Copolymer Micelles

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.

Inside Front Cover: Self-Assembly of Diblock-Copolymer Micelles for Template-Based Preparation of PbTiO3 Nanograins (Adv. Funct. Mater. 18/2006)

2006 ◽  
Vol 16 (18) ◽  
pp. NA-NA
Author(s):  
S. Kronholz ◽  
S. Rathgeber ◽  
S. Karthäuser ◽  
H. Kohlstedt ◽  
S. Clemens ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Front Cover ◽  
Copolymer Micelles

Multi-responsive hollow nanospheres self-assembly by amphiphilic random copolymer and azobenzene

Polymer ◽  
2019 ◽  
Vol 175 ◽  
pp. 235-242 ◽  
Author(s):  
Yihan Wang ◽  
Lizhi Hu ◽  
Qiang Yin ◽  
Kai Du ◽  
Taoran Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Random Copolymer ◽  
Hollow Nanospheres

Synthesis of bottlebrush block copolymers from bottlebrush polystyrene and bottlebrush random copolymer of ω ‐end‐norbornyl polymethacrylates and their self‐assembly

2020 ◽  
Vol 58 (16) ◽  
pp. 2159-2167 ◽  
Author(s):  
Ho‐Bin Seo ◽  
Myung‐Jin Kim ◽  
Yong‐Guen Yu ◽  
Chang‐Geun Chae ◽  
Jae‐Suk Lee
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Random Copolymer

scholarly journals Complex Temperature and Concentration Dependent Self-Assembly of Poly(2-oxazoline) Block Copolymers

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1495 ◽  
Author(s):  
Loan Trinh Che ◽  
Marianne Hiorth ◽  
Richard Hoogenboom ◽  
Anna-Lena Kjøniksen
Keyword(s):  
High Temperatures ◽  
Self Assembly ◽  
Low Temperatures ◽  
Polymer Concentration ◽  
Random Copolymer ◽  
Polymer Chains ◽  
Relaxation Modes ◽  
Self Association ◽  
Copolymer Structure ◽  
Complex Temperature

The effect of polymer concentration on the temperature-induced self-association of a block copolymer comprising a poly(2-ethyl-2-oxazoline) block and a random copolymer block consisting of 2-ethyl-2-oxazoline and 2-n-propyl-2-oxazoline (PEtO80-block-P(EtOxx-stat-PropO40-x) with x = 0, 4, or 8 were investigated by dynamic light scattering (DLS) and transmittance measurements (turbidimetry). The polymers reveal a complex aggregation behavior with up to three relaxation modes in the DLS data and with a transmittance that first goes through a minimum before it declines at high temperatures. At low temperatures, unassociated polymer chains were found to co-exist with larger aggregates. As the temperature is increased, enhanced association and contraction of the aggregates results in a drop of the transmittance values. The aggregates fragment into smaller micellar-like clusters when the temperature is raised further, causing the samples to become optically clear again. At high temperatures, the polymers aggregate into large compact clusters, and the samples become turbid. Interestingly, very large aggregates were observed at low temperatures when the polymer concentrations were low. The formation of these aggregates was also promoted by a more hydrophilic copolymer structure. The formation of large aggregates with an open structure at conditions where the solvent conditions are improved is probably caused by depletion flocculation of the smaller aggregates.

Self-Assembly of Block Copolymer Micelles in an Ionic Liquid

2006 ◽  
Vol 128 (8) ◽  
pp. 2745-2750 ◽  
Author(s):  
Yiyong He ◽  
Zhibo Li ◽  
Peter Simone ◽  
Timothy P. Lodge
Keyword(s):  
Ionic Liquid ◽  
Block Copolymer ◽  
Self Assembly ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Enzymatic synthesis of poly(ω-pentadecalactone-co-butylene-co-3,3′-dithiodipropionate) copolyesters and self-assembly of the PEGylated copolymer micelles as redox-responsive nanocarriers for doxorubicin delivery

2015 ◽  
Vol 6 (11) ◽  
pp. 1997-2010 ◽  
Author(s):  
Bo Liu ◽  
Xiaofang Zhang ◽  
Ya Chen ◽  
Zhicheng Yao ◽  
Zhe Yang ◽  
...  
Keyword(s):  
Anticancer Drug ◽  
Self Assembly ◽  
Enzymatic Synthesis ◽  
Drug Carriers ◽  
Redox Responsive ◽  
Copolymer Micelles ◽  
Doxorubicin Delivery

The PEG-polyester copolymers bearing disulfide groups were synthesized to serve as redox-responsive anticancer drug carriers with an enhanced efficacy.

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