scholarly journals Conformation Variation and Tunable Protein Adsorption through Combination of Poly(acrylic acid) and Antifouling Poly(N-(2-hydroxyethyl) acrylamide) Diblock on a Particle Surface

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 566
Author(s):  
Zun Wang ◽  
Kaimin Chen ◽  
Chen Hua ◽  
Xuhong Guo
Keyword(s):  
Acrylic Acid ◽  
Protein Adsorption ◽  
Polymer Brushes ◽  
Biomedical Applications ◽  
Critical Role ◽  
Particle Surface ◽  
Ph Values ◽  
Bsa Binding ◽  
Biomaterial Surfaces ◽  
Poly Acrylic Acid

Adsorption and desorption of proteins on biomaterial surfaces play a critical role in numerous biomedical applications. Spherical diblock polymer brushes (polystyrene with photoiniferter (PSV) as the core) with different block sequence, poly(acrylic acid)-b-poly(N-(2-hydroxyethyl) acrylamide) (PSV@PAA-b-PHEAA) and poly(N-(2-hydroxyethyl) acrylamide)-b-poly(acrylic acid) (PSV@PHEAA-b-PAA) were prepared via surface-initiated photoiniferter-mediated polymerization (SI-PIMP) and confirmed by a series of characterizations including TEM, Fourier transform infrared (FTIR) and elemental analysis. Both diblock polymer brushes show typical pH-dependent properties measured by dynamic light scattering (DLS) and Zeta potential. It is interesting to find out that conformation of PSV@PAA-b-PHEAA uniquely change with pH values, which is due to cooperation of electrostatic repulsion and steric hindrance. High-resolution turbidimetric titration was applied to explore the behavior of bovine serum albumin (BSA) binding to diblock polymer brushes, and the protein adsorption could be tuned by the existence of PHEAA as well as apparent PAA density. These studies laid a theoretical foundation for design of diblock polymer brushes and a possible application in biomedical fields.

scholarly journals Surface Modification of TFC-PA RO Membrane by Grafting Hydrophilic pH Switchable Poly(Acrylic Acid) Brushes

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Muhammad Asad Abbas ◽  
Shehla Mushtaq ◽  
Waqas A. Cheema ◽  
Hazim Qiblawey ◽  
Shenmin Zhu ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Polymer Brushes ◽  
Water Flux ◽  
Flux Rate ◽  
Ph Responsive ◽  
Salt Rejection ◽  
Pore Sizes ◽  
Ph Values ◽  
Membrane Surfaces ◽  
Poly Acrylic Acid

The grafting of pH-responsive poly(acrylic acid) (PAA) brushes was carried out on the surface of a commercial TFC-PA membrane using surface-initiated atom transfer radical polymerization (SI-ATRP). Poly(t-butyl acrylate) was polymerized through the SI-ATRP method followed by its acid hydrolysis to form PAA hydrophilic polymer brushes. Surface morphology, permeation flux, salt rejection, and pore sizes were investigated. The contact angle for water was reduced from 50° for a pristine membrane to 27° for the modified membrane due to a modification with the hydrophilic functional group and its brush on membrane surfaces. The flux rate also increased noticeably at lower pH values relative to higher pH for the modified membranes, while the flux remains stable in the case of pristine TFC-PA membranes. There is slight transition in the water flux rate that was also observed when going from pH values of 3 to 5. This was attributed to the pH-responsive conformational changes for the grafted PAA brushes. At these pH values, ionization of the COOH group takes place below and above pKa to influence the effective pore dimension of the modified membranes. At a lower pH value, the PAA brushes seem to permit tight structure conformation resulting in larger pore sizes and hence more flux. On the other hand, at higher pH values, PAA brushes appeared to be in extended conformation to induce smaller pore sizes and result in less flux. Further, pH values were observed to not significantly affect the NaCl salt rejection with values observed in between 98.8% and 95% and close to that of the pristine TFC-PA membranes. These experimental results are significant and have immediate implication for advances in polymer technology to design and modify the “switchable membrane surfaces” with controllable charge distribution and surface wettability, as well as regulation of water flux and salt.

Topology Effect of AIEgen-Appended Poly(acrylic acid) with Biocompatible Segments on Ca2+-Sensing and Protein-Adsorption-Resistance Properties

2018 ◽  
Vol 7 (6) ◽  
pp. 711-715 ◽  
Author(s):  
Fumitaka Ishiwari ◽  
Minami Sakamoto ◽  
Satoko Matsumura ◽  
Takanori Fukushima
Keyword(s):  
Acrylic Acid ◽  
Protein Adsorption ◽  
Poly Acrylic Acid

Controlled Evaporative Self-Assembly of Poly(acrylic acid) in a Confined Geometry for Fabricating Patterned Polymer Brushes

Langmuir ◽  
2014 ◽  
Vol 30 (16) ◽  
pp. 4863-4867 ◽  
Author(s):  
Yonghong Men ◽  
Peng Xiao ◽  
Jing Chen ◽  
Jun Fu ◽  
Youju Huang ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Self Assembly ◽  
Polymer Brushes ◽  
Confined Geometry ◽  
Poly Acrylic Acid

scholarly journals Comparison of stability properties of poly(acrylic acid) adsorbed on the surface of silica, alumina and mixed silica-alumina nanoparticles — application of turbidimetry method

2014 ◽  
Vol 12 (4) ◽  
pp. 476-479 ◽  
Author(s):  
Małgorzata Wiśniewska ◽  
Teresa Urban ◽  
Agnieszka Nosal-Wiercińska ◽  
Vladimir Zarko ◽  
Vladimir Gun’ko
Keyword(s):  
Acrylic Acid ◽  
Colloidal Suspensions ◽  
Alumina Nanoparticles ◽  
Solution Ph ◽  
Ph Values ◽  
Silica Alumina ◽  
Effective Stabilizer ◽  
The Stability ◽  
Over Time ◽  
Poly Acrylic Acid

AbstractThe influence of anionic poly(acrylic acid) — PAA addition on the stability of synthesized silica, alumina and mixed silica-alumina suspensions as a function of solution pH was studied. The turbidimetry method was used to monitor the changes of the examined systems stability over time. The calculated stability coefficients enabled estimation of polymer adsorption influence on stability of metal oxide suspension. It was shown that the alumina suspension without the polymer is the most unstable at the pH values 6 and 9, whereas the silica polymer was most unstable at pH 3. PAA with higher molecular weight (240 000) is a relatively effective stabilizer of all investigated adsorbents (except silica at pH 3). These properties of poly(acrylic acid) are highly desirable in many branches of industry (e.g. production of cosmetics, pharmaceuticals, paints) where polymers are widely used as effective stabilizers of colloidal suspensions.

Covalent immobilization of dysprosium-based metal–organic chains on silicon-based polymer brush surfaces

2017 ◽  
Vol 41 (15) ◽  
pp. 7007-7011
Author(s):  
Ana Belén Ruiz-Muelle ◽  
Antonio Rodríguez-Diéguez ◽  
Rafael Contreras-Cáceres ◽  
Ignacio Fernández
Keyword(s):  
Carboxylic Acid ◽  
Acrylic Acid ◽  
Polymer Brushes ◽  
Polymer Brush ◽  
Covalent Immobilization ◽  
Sodium Ions ◽  
Metal Organic ◽  
Silicon Based ◽  
Poly Acrylic Acid

We report on a process for immobilizing metal–organic chains constructed of dysprosium and sodium ions based on 5-aminopyridine-2-carboxylic acid, onto silicon-based surfaces coated with poly(acrylic acid) (PAA) polymer brushes.

TEMPO driven thiol-ene reaction for the preparation of polymer functionalized silicon wafers

2021 ◽  
Author(s):  
Sumbul Hafeez ◽  
Leena Nebhani
Keyword(s):  
Acrylic Acid ◽  
Polymer Brushes ◽  
Silicon Wafers ◽  
Ene Reaction ◽  
Isopropyl Acrylamide ◽  
Poly Acrylic Acid

TEMPO driven thiol-ene reaction was utilized to prepare silicon (Si) wafers modified with variety of polymer brushes, such as, poly(N-isopropyl acrylamide), polystyrene, poly(isobornylacrylate), poly(acrylic acid) as well as functionalized cysteine....

Selective Adsorption and Separation of Organic Dyes by Poly(acrylic acid) Hydrogels Formed with Spherical Polymer Brushes and Chitosan

2018 ◽  
Vol 71 (11) ◽  
pp. 846 ◽  
Author(s):  
Rui Zhang ◽  
Hongwei Peng ◽  
Tianxu Zhou ◽  
Min Li ◽  
Xuhong Guo ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Polymer Brushes ◽  
Electrostatic Interactions ◽  
Separation Efficiency ◽  
Organic Dyes ◽  
Selective Adsorption ◽  
Cationic Dyes ◽  
Order Kinetic ◽  
Double Network ◽  
Poly Acrylic Acid

Direct discharge of industry organic dyes has caused serious environmental pollution. In this study, a series of double network poly(acrylic acid) (PAA) hydrogels were fabricated with spherical polymer brushes (SPBs) and chitosan (CS) as crosslinker. Neutral spherical polyelectrolyte brushes of polystyrene–poly-N-isopropylacrylamide (PNIPAM@PS) in which poly(N-isopropylacrylamide) (PNIPAM) arms were grafted on polystyrene (PS) nanospheres, were employed as macro-crosslinkers. The innumerable hydrogen bonds both between the highly entangled PAA chains and between PNIPAM and the PAA chains composed the first network of the hydrogels. The electrostatic interactions between CS and the PAA chains formed the second network of the hydrogels. These double network hydrogels, named PNIPAM@PS/CS/PAA, achieve good compressive performance and a low swell ratio because of their compact structure through plentiful hydrogen bonding and electrostatic interactions. The hydrogel could absorb cationic dyes from water with high separation efficiency and selectivity due to the electrostatic interaction between the carboxy groups and dye molecules. The adsorption process fitted a pseudo-second-order kinetic model and Langmuir isotherm model very well. Moreover, the hydrogel can separate cationic dyes from mixed dye solutions through electrostatic interactions. After being loaded with silver nanoparticles, the obtained silver@hydrogel exhibited a good capacity for the photocatalytic degradation towards different dyes. The hydrogels are promising for dye-containing wastewater treatment.

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