scholarly journals Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 455 ◽  
Author(s):  
Tae-Young Heo ◽  
Inhye Kim ◽  
Liwen Chen ◽  
Eunji Lee ◽  
Sangwoo Lee ◽  
...  
Keyword(s):  
Glycidyl Ether ◽  
Degree Of Polymerization ◽  
Detailed Model ◽  
Ionic Group ◽  
Micelle Structure ◽  
Complex Coacervate ◽  
Allyl Glycidyl Ether ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Contrast Matching

Pairs of ionic group dependence of the structure of a complex coacervate core micelle (C3M) in an aqueous solution was investigated using DLS, cryo-TEM, and SANS with a contrast matching technique and a detailed model analysis. Block copolyelectrolytes were prepared by introducing an ionic group (i.e., ammonium, guanidinium, carboxylate, and sulfonate) to poly(ethylene oxide-b-allyl glycidyl ether) (NPEO = 227 and NPAGE = 52), and C3Ms were formed by simple mixing of two oppositely-charged block copolyelectrolyte solutions with the exactly same degree of polymerization. All four C3Ms are spherical with narrow distribution of micelle dimension, and the cores are significantly swollen by water, resulting in relatively low brush density of PEO chains on the core surface. With the pair of strong polyelectrolytes, core radius and aggregation number increases, which reflects that the formation of complex coacervates are significantly sensitive to the pairs of ionic groups rather than simple charge pairing.

scholarly journals Association Behavior of Amphiphilic ABA Triblock Copolymer Composed of Poly(2-methoxyethyl acrylate) (A) and Poly(ethylene oxide) (B) in Aqueous Solution

2021 ◽  
Author(s):  
Yoko Mizoue ◽  
Kazutoshi Haraguchi ◽  
Shin-ichi Yusa
Keyword(s):  
Ethylene Oxide ◽  
Fluorescence Probe ◽  
Blood Compatibility ◽  
Degree Of Polymerization ◽  
Light Scattering Intensity ◽  
Association Behavior ◽  
Poly Ethylene Oxide ◽  
Similar Appearance ◽  
Single Flower ◽  
Poly Ethylene

Poly(2-methoxyethyl acrylate) (PMEA) and poly(ethylene oxide) (PEO) have protein-antifouling properties and blood compatibility. ABA triblock copolymers (PMEAn-PEO11340-PMEAn (MEOMn)) were prepared using single-electron transfer-living radical polymerization (SET-LRP) using a bi-functional PEO macroinitiator. Two types of MEOMn composed of PMEA blocks with a degree of polymerization (DP = n) of 85 and 777 were prepared using the same PEO macroinitiator. MEOMn formed flower micelles with a hydrophobic PMEA (A) core and hydrophilic PEO (B) loop shells in diluted water with a similar appearance to petals. The hydrodynamic radii of MEOM85 and MEOM777 were 151 and 108 nm, respectively. The PMEA block with a large DP formed a tightly packed core. The aggregation number (Nagg) of the PMEA block in a single flower micelle for MEOM85 and MEOM777 was 156 and 164, respectively, which were estimated using a light scat-tering technique. The critical micelle concentrations (CMCs) for MEOM85 and MEOM777 were 0.01 and 0.002 g/L, respectively, as determined by the light scattering intensity and fluorescence probe techniques. The size, Nagg, and CMC for MEOM85 and MEOM777 were almost the same inde-pendent of hydrophobic DP of the PMEA block.

scholarly journals Micelle Structure Details and Stabilities of Cyclic Block Copolymer Amphiphile and Its Linear Analogues

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 163 ◽  
Author(s):  
Brian J. Ree ◽  
Toshifumi Satoh ◽  
Takuya Yamamoto
Keyword(s):  
Structural Integrity ◽  
Positive Impact ◽  
Structural Parameters ◽  
Micelle Formation ◽  
Cyclic Polymer ◽  
X Ray Scattering ◽  
Micelle Structure ◽  
Cyclic Block ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

In this study, we investigate structures and stabilities of the micelles of a cyclic amphiphile (c-PBA-b-PEO) composed of poly(-n-butyl acrylate) (PBA) and poly(ethylene oxide) (PEO) blocks and its linear diblock and triblock analogues (l-PBA-b-PEO and -l-PBA--b-PEO-b-PBA) by using synchrotron X-ray scattering and quantitative data analysis. The comprehensive scattering analysis gives details and insights to the micellar architecture through structural parameters. Furthermore, this analysis provides direct clues for structural stabilities in micelles, which can be used as a good guideline to design highly stable micelles. Interestingly, in water, all topological polymers are found to form ellipsoidal micelles rather than spherical micelles; more interestingly, the cyclic polymer and its linear triblock analog make oblate-ellipsoidal micelles while the linear diblock analog makes a prolate-ellipsoidal micelle. The analysis results collectively inform that the cyclic topology enables more compact micelle formation as well as provides a positive impact on the micellar structural integrity.

Synthesis and sequence-controlled self-assembly of amphiphilic triblock copolymers based on functional poly(ethylene glycol)

2017 ◽  
Vol 8 (45) ◽  
pp. 6964-6971 ◽  
Author(s):  
Yanxin Qi ◽  
Bin Li ◽  
Yupeng Wang ◽  
Yubin Huang
Keyword(s):  
Ethylene Glycol ◽  
Self Assembly ◽  
Ring Opening ◽  
Glycidyl Ether ◽  
Ring Opening Polymerization ◽  
Poly Ethylene Glycol ◽  
Amphiphilic Triblock Copolymer ◽  
Allyl Glycidyl Ether ◽  
Poly Ethylene ◽  
Copolymer Poly

Given the increasing prosperity of multifunctional poly(ethylene glycol) (mf-PEG), an amphiphilic triblock copolymer, poly(ethylene glycol)-block-poly(ε-caprolactone)-block-poly(allyl glycidyl ether) (mPEG-PCL-PAGE), was synthesized by a combination of living ring-opening polymerization (ROP) and click chemistry.

Preparation and Solution Behavior of a Thermoresponsive Diblock Copolymer of Poly(ethyl glycidyl ether) and Poly(ethylene oxide)

Langmuir ◽  
2007 ◽  
Vol 23 (18) ◽  
pp. 9429-9434 ◽  
Author(s):  
Michihiro Ogura ◽  
Hiroyuki Tokuda ◽  
Shin-ichiro Imabayashi ◽  
Masayoshi Watanabe
Keyword(s):  
Ethylene Oxide ◽  
Diblock Copolymer ◽  
Glycidyl Ether ◽  
Solution Behavior ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene
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