Self-Assembly and Optical Property of Triblock Copolymers Made of Polystyrene and Oligo(p-phenyleneethynylene) in Different Mixtures of Toluene and Hexane

2007 ◽  
Vol 40 (18) ◽  
pp. 6692-6698 ◽  
Author(s):  
Hong Huo ◽  
Kun Li ◽  
Qing Wang ◽  
Chi Wu
Keyword(s):  
Optical Property ◽  
Self Assembly ◽  
Triblock Copolymers

Self-Assembly of Hydrogels From Elastin-Mimetic Block Copolymers

2002 ◽  
Vol 724 ◽  
Author(s):  
Elizabeth R. Wright ◽  
R. Andrew McMillan ◽  
Alan Cooper ◽  
Robert P. Apkarian ◽  
Vincent P. Conticello
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Variable Temperature ◽  
Inverse Temperature ◽  
Temperature Transition ◽  
Scanning Calorimetry ◽  
Design Synthesis ◽  
Inverse Temperature Transition ◽  
Functional Biomaterials

AbstractTriblock copolymers have traditionally been synthesized with conventional organic components. However, triblock copolymers could be synthesized by the incorporation of two incompatible protein-based polymers. The polypeptides would differ in their hydrophobicity and confer unique physiochemical properties to the resultant materials. One protein-based polymer, based on a sequence of native elastin, that has been utilized in the synthesis of biomaterials is poly (Valine-Proline-Glycine-ValineGlycine) or poly(VPGVG) [1]. This polypeptide has been shown to have an inverse temperature transition that can be adjusted by non-conservative amino acid substitutions in the fourth position [2]. By combining polypeptide blocks with different inverse temperature transition values due to hydrophobicity differences, we expect to produce amphiphilic polypeptides capable of self-assembly into hydrogels. Our research examines the design, synthesis and characterization of elastin-mimetic block copolymers as functional biomaterials. The methods that are used for the characterization include variable temperature 1D and 2D High-Resolution-NMR, cryo-High Resolutions Scanning Electron Microscopy and Differential Scanning Calorimetry.

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.

Synthesis and self-assembly behaviour of poly(Nα-Boc-l-tryptophan)-block-poly(ethylene glycol)-block-poly(Nα-Boc-l-tryptophan)

RSC Advances ◽  
2016 ◽  
Vol 6 (29) ◽  
pp. 24142-24153
Author(s):  
Andreea S. Voda ◽  
Kevin Magniez ◽  
Nisa V. Salim ◽  
Cynthia Wong ◽  
Qipeng Guo
Keyword(s):  
Drug Delivery ◽  
Ethylene Glycol ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Potential Drug ◽  
Poly Ethylene Glycol ◽  
Drug Delivery Applications ◽  
Poly Ethylene ◽  
First Time

We report for the first time the use of Nα-Boc-l-tryptophan for the synthesis of amphiphilic BAB triblock copolymers for potential drug delivery applications.

Self-assembly of amphiphilic di and triblock copolymers of styrene and quaternized 5-(N,N-diethylamino) isoprene in selective solvents

Polymer ◽  
2003 ◽  
Vol 44 (7) ◽  
pp. 2117-2128 ◽  
Author(s):  
Izabel C Riegel ◽  
Dimitrios Samios ◽  
Cesar L Petzhold ◽  
Adi Eisenberg
Keyword(s):  
Self Assembly ◽  
Triblock Copolymers ◽  
Selective Solvents

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...

Self-assembly of block copolymers into sieve-like particles with arrayed switchable channels and as scaffolds to guide the arrangement of gold nanoparticles

Nanoscale ◽  
2017 ◽  
Vol 9 (39) ◽  
pp. 15056-15061 ◽  
Author(s):  
Yun He ◽  
Yan Zhang ◽  
Nan Yan ◽  
Yutian Zhu ◽  
Wei Jiang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Emulsion Droplets

The unique sieve-like particles with lattice arrayed switchable channels were created via the confined self-assembly of P4VP-b-PS-b-P4VP triblock copolymers within the emulsion droplets.

scholarly journals Complex Self-Assembly Behavior of Bis-hydrophilic PEO-b-PCL-b-PMOXA Triblock Copolymers in Aqueous Solution

2017 ◽  
Vol 50 (18) ◽  
pp. 7155-7168 ◽  
Author(s):  
Evgeniia V. Konishcheva ◽  
Ulmas E. Zhumaev ◽  
Maximilian Kratt ◽  
Valentin Oehri ◽  
Wolfgang Meier
Keyword(s):  
Aqueous Solution ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Assembly Behavior

Symmetric Poly(ethylene oxide-b-styrene-b-isoprene) Triblock Copolymers: Synthesis, Characterization, and Self-Assembly in Bulk and Thin Film

2014 ◽  
Vol 47 (18) ◽  
pp. 6373-6381 ◽  
Author(s):  
Yali Qiao ◽  
Rachel Ferebee ◽  
Bongjoon Lee ◽  
Indranil Mitra ◽  
Nathaniel A. Lynd ◽  
...  
Keyword(s):  
Thin Film ◽  
Ethylene Oxide ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

A lattice self-consistent field study of self-assembly of grafted ABA triblock copolymers in a selective solvent

Polymer ◽  
2018 ◽  
Vol 140 ◽  
pp. 278-289 ◽  
Author(s):  
Wenjuan Qiu ◽  
Zheng Wang ◽  
Yuhua Yin ◽  
Run Jiang ◽  
Baohui Li ◽  
...  
Keyword(s):  
Field Study ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Selective Solvent ◽  
Consistent Field ◽  
Self Consistent ◽  
Self Consistent Field
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