scholarly journals Isotactic-Polypropylene/Atactic-Polystyrene Miktoarm Star Copolymers: Synthesis and Aggregation Morphology

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1574
Author(s):  
Yuanjie Wang ◽  
Xinzhi Liu ◽  
Liying Liu ◽  
Hui Niu
Keyword(s):  
Isotactic Polypropylene ◽  
Casting Process ◽  
Material Surface ◽  
Selective Solvent ◽  
Sliding Angle ◽  
Water Contact ◽  
The Core ◽  
Star Copolymers ◽  
Atactic Polystyrene ◽  
Miktoarm Star

In this work, a series of isotactic-polypropylene/atactic-polystyrene (iPP/aPS) miktoarm star copolymers, PxSy, was synthesized via an arm-first approach. Varied star macromolecule architectures were fabricated by designing the arm length and the arm numbers (x and y). These miktoarm stars were able to form micelles in selective solvent (N,N′-dimethylformamide (DMF)), in which the insoluble iPP arms formed the core and the soluble aPS arms formed the shell. The miktoarm polymers aggregated to micro-nanoscale binary structures (MNBSes) in the casting process, and their morphologies, including the MNBS shape and size, were greatly influenced by the PxSy architectures. The MNBSes endowed the material surface with superhydrophobic performance with a water contact angle of 157.0° and a sliding angle of 1.5°.

scholarly journals Miktoarm Star Copolymers Prepared by Transformation from Enhanced Spin Capturing Polymerization to Nitroxide-Mediated Polymerization (ESCP-Ŧ-NMP) toward Nanomaterials

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2392
Author(s):  
Tzu-Yao Lin ◽  
Cheng-Wei Tu ◽  
Junko Aimi ◽  
Yu-Wen Huang ◽  
Tongsai Jamnongkan ◽  
...  
Keyword(s):  
Physical Property ◽  
Water Contact ◽  
Force Microscopy ◽  
Atomic Force ◽  
Star Copolymers ◽  
Ft Ir ◽  
Miktoarm Star ◽  
The Difference ◽  
Reversible Deactivation Radical Polymerization ◽  
Nitroxide Mediated Polymerization

Reversible-deactivation radical polymerization (RDRP) serves as a powerful tool nowadays for the preparations of unique linear and non-linear macromolecules. In this study, enhanced spin capturing polymerizations (ESCPs) of styrene (St) and tert-butyl acrylate (tBA) monomers were, respectively, conducted in the presence of difunctional (1Z,1′Z)-1,1′-(1,4-phenylene) bis (N-tert-butylmethanimine oxide) (PBBN) nitrone. Four-arm (PSt)4 and (PtBA)4 star macroinitiators (MIs) can be afforded. By correspondingly switching the second monomer (i.e., tBA and St), miktoarm star copolymers (μ-stars) of (PSt)2-μ-(PtBA-b-PSt)2 and (PtBA)2-μ-(PSt-b-PtBA)2) were thus obtained. We further conducted hydrolysis of the PtBA segments to PAA (i.e., poly(acrylic acid)) in μ-stars to afford amphiphilic μ-stars of (PSt)2-μ-(PAA-b-PSt)2 and (PAA)2-μ-(PSt-b-PAA)2. We investigated each polymerization step and characterized the obtained two sets of “sequence-isomeric” μ-stars by FT-IR, 1H NMR, differential scanning calorimeter (DSC), and thermogravimetric analysis (TGA). Interestingly, we identified their physical property differences in the case of amphiphilic μ-stars by water contact angle (WCA) and atomic force microscopy (AFM) measurements. We thus proposed two microstructures caused by the difference of polymer chain sequences. Through this polymerization transformation (Ŧ) approach (i.e., ESCP-Ŧ-NMP), we demonstrated an interesting and facile strategy for the preparations of μ-stars with adjustable/switchable interior and exterior polymer structures toward the preparations of various nanomaterials.

Influence of Polymer Architecture on the Formation of Micelles of Miktoarm Star Copolymers Polyethylene/Poly(ethylenepropylene) in the Selective Solvent Decane

1997 ◽  
Vol 30 (23) ◽  
pp. 7171-7182 ◽  
Author(s):  
A. Ramzi ◽  
M. Prager ◽  
D. Richter ◽  
V. Efstratiadis ◽  
N. Hadjichristidis ◽  
...  
Keyword(s):  
Selective Solvent ◽  
Polymer Architecture ◽  
Star Copolymers ◽  
Miktoarm Star

Hydrodynamics of polystyrene–polyisoprene miktoarm star copolymers in a selective and a non-selective solvent

Soft Matter ◽  
2012 ◽  
Vol 8 (39) ◽  
pp. 10061 ◽  
Author(s):  
Juan Pablo Hinestrosa ◽  
David Uhrig ◽  
Deanna L. Pickel ◽  
Jimmy W. Mays ◽  
S. Michael Kilbey II
Keyword(s):  
Selective Solvent ◽  
Star Copolymers ◽  
Miktoarm Star

scholarly journals Effects of Asymmetric Molecular Architecture on Chain Stretching and Dynamics in Miktoarm Star Copolymers

2020 ◽  
Author(s):  
Thomas Kinsey ◽  
Emmanuel Urandu Mapesa ◽  
Weiyu Wang ◽  
Kunlun Hong ◽  
Jimmy Mays ◽  
...  
Keyword(s):  
Molecular Architecture ◽  
Star Copolymers ◽  
Miktoarm Star

Synthesis of deuterobutadiene-butadiene AB 2 and AB 3 miktoarm star copolymers

1998 ◽  
Vol 41 (3) ◽  
pp. 283-289 ◽  
Author(s):  
L. R. Hutchings ◽  
R. W. Richards
Keyword(s):  
Star Copolymers ◽  
Miktoarm Star

Fabrication of super-hydrophobic filter paper via mixed wax phase separation for efficient oil/water separation

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 5794-5805
Author(s):  
Yating Wang ◽  
Xiaochun Chen ◽  
Yaqi Liang ◽  
Chenghua Yu
Keyword(s):  
Filter Paper ◽  
Surface Composition ◽  
Low Cost ◽  
Sliding Angle ◽  
Coated Paper ◽  
Water Contact ◽  
Water Separation ◽  
Oil Separation ◽  
Paper Surface ◽  
Superhydrophobic Paper

Despite previous efforts, the fabrication of superhydrophobic substrate via an environment friendly and easy approach remains a great challenge. In this study, a low cost, simple, and green procedure was developed to prepare a superhydrophobic paper surface that is acceptable for the papermaking industry. First, a wax mixture (beeswax & carnauba wax) was emulsified and coated on the filter paper surface. Then, the coated paper was annealed at different temperatures. The further heat-treatment-rendered wax-coated paper hydrophobic or superhydrophobic because submicrometer or micrometer wax structures were present on the paper surface. The water contact angle of the annealed filter paper sample reached 151.5° at 60 °C, and the sliding angle was under 10°. Further, the relationship between surface composition and the hydrophobic properties of the coated paper samples was discussed. The obtained paper samples showed great potential in water/oil separation, as they had an efficiency over 99%. This work proposed a new simple and mild approach to fabricate superhydrophobic filter papers and explored the hydrophobicity and water/oil separation properties.

scholarly journals Cylindrical Micelles by the Self-Assembly of Crystalline-b-Coil Polyphosphazene-b-P2VP Block Copolymers. Stabilization of Gold Nanoparticles

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1772 ◽  
Author(s):  
Maria de los Angeles Cortes ◽  
Raquel de la Campa ◽  
Maria Luisa Valenzuela ◽  
Carlos Díaz ◽  
Gabino A. Carriedo ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Self Assembly ◽  
Cationic Polymerization ◽  
The Self ◽  
The Novel ◽  
Selective Solvent ◽  
The Core ◽  
Cylindrical Micelles ◽  
Main Factor

During the last number of years a variety of crystallization-driven self-assembly (CDSA) processes based on semicrystalline block copolymers have been developed to prepare a number of different nanomorphologies in solution (micelles). We herein present a convenient synthetic methodology combining: (i) The anionic polymerization of 2-vinylpyridine initiated by organolithium functionalized phosphane initiators; (ii) the cationic polymerization of iminophosphoranes initiated by –PR2Cl2; and (iii) a macromolecular nucleophilic substitution step, to prepare the novel block copolymers poly(bistrifluoroethoxy phosphazene)-b-poly(2-vinylpyridine) (PTFEP-b-P2VP), having semicrystalline PTFEP core forming blocks. The self-assembly of these materials in mixtures of THF (tetrahydrofuran) and 2-propanol (selective solvent to P2VP), lead to a variety of cylindrical micelles of different lengths depending on the amount of 2-propanol added. We demonstrated that the crystallization of the PTFEP at the core of the micelles is the main factor controlling the self-assembly processes. The presence of pyridinyl moieties at the corona of the micelles was exploited to stabilize gold nanoparticles (AuNPs).

Synthesis and Morphological Behavior of Model 6-Miktoarm Star Copolymers, PS(P2MP)5, of Styrene (S) and 2-Methyl-1,3-Pentadiene (P2MP)

2006 ◽  
Vol 18 (8) ◽  
pp. 2164-2168 ◽  
Author(s):  
Anastasios Mavroudis ◽  
Apostolos Avgeropoulos ◽  
Nikos Hadjichristidis ◽  
Edwin L. Thomas ◽  
David J. Lohse
Keyword(s):  
Star Copolymers ◽  
Morphological Behavior ◽  
Miktoarm Star

The Surface Modification and Characteristics of Useful Expanded PTFE Composites by Photo-Radiation Methods

2013 ◽  
Vol 690-693 ◽  
pp. 1636-1640 ◽  
Author(s):  
Te Hsing Wu ◽  
Ko Shao Chen ◽  
Lie Hang Shen
Keyword(s):  
Contact Angle ◽  
Acetic Acid ◽  
Photoelectron Spectroscopy ◽  
Plasma Deposition ◽  
Material Surface ◽  
Water Contact ◽  
X Ray ◽  
Hydrogel Film ◽  
Γ Ray ◽  
Ptfe Composites

In this study, We immobilized hydrogel material onto expanded polytetrafluoroethylene (ePTFE) film and used as an functional biomaterial. The material is a film containing titanium oxide onto polymer sheet. The hydrogel film is hydrophilic, bacterial inactivated and bio-compatible. In order to improve the ePTFE film biocompatibility, the cold plasma or γ-ray technology was used with acetic acid as monomer to deposit onto ePTFE film and then (N-isopropylacrylamide) was grafted onto the surface by radiation photo-grafting. The characteristics of the material surface were evaluated with X-ray photoelectron spectroscopy (XPS), FTIR and water contact angle. It was found that the contact angle of water on the untreated ePTFE significantly decrease from125° to 72° after ePTFE film being treated with acetic acid plasma deposition procedure. Due to the hydrophilicity of poly (N-isopropylacrylamide), so the contact angle of water on the ePTFE-g-NIPAAm almost approached to 0°. This thermal sensitive ePTFE hydrogels can be applied to artificial guiding tube and wound dressing material.

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