scholarly journals Preparation of pH-responsive asymmetric polysulfone ultrafiltration membranes with enhanced anti-fouling properties and performance by incorporating poly(2-ethyl-2-oxazoline) additive

RSC Advances ◽  
2018 ◽  
Vol 8 (72) ◽  
pp. 41270-41279 ◽  
Author(s):  
Ruizhang Xu ◽  
Jiantao Wang ◽  
DanDan Chen ◽  
Feng Yang ◽  
Jian Kang ◽  
...  
Keyword(s):  
Ph Value ◽  
Ph Responsive ◽  
Ultrafiltration Membranes ◽  
Polymeric Additives ◽  
And Performance

In this study, pH value-responsive and anti-fouling enhanced asymmetric polysulfone (PSf) ultrafiltration membranes have been prepared by incorporating poly(2-ethyl-2-oxazoline) (PEOX) as polymeric additives.

The Study about Environmentally-Friendly Passivation Technology Process and Performance on Brass Surface

2011 ◽  
Vol 399-401 ◽  
pp. 1967-1971
Author(s):  
Hong Yin Xu ◽  
Li Li
Keyword(s):  
Corrosion Resistance ◽  
Phytic Acid ◽  
Passive Film ◽  
Ph Value ◽  
Sodium Molybdate ◽  
Solution Ph ◽  
Sulfosalicylic Acid ◽  
Passivation Film ◽  
Brass Surface ◽  
And Performance

The paper through the synergy before mixed Phytic acid and Sodium molybdate, Sulfosalicylic acid, Organic silane, and add the active substances PEG, Optimize the Passivation liquid formula of Brass surface, Phytic acid is the main ingredient, study the affection of Phytic acid Passive film Corrosion resistance on the three main Passivation conditions: Passivation temperature, time and Passivation solution PH value. The results show that，Phytic acid passivation film process recipes as follows：Phytic acid (quality score 50%) 2~5ml/L, sodium molybdate 4~8g/L, organic material 10~30ml/L, sulfosalicylic acid 3~7g/L, polyethylene glycol 2~6g/L, deactivated temperature 30~35°C, pH value 5, deactivated time 60s. The test showed that，the phytic acid passive film can obviously enhance the anti-corrosive performance on the brass surface, its corrosion resistance proportion chromates passive film is fairly good.

Preparation and performance of the novel PVDF ultrafiltration membranes blending with PVA modified SiO2 hydrophilic nanoparticles

2018 ◽  
Vol 59 (S1) ◽  
pp. E412-E421 ◽  
Author(s):  
De Sun ◽  
Dongmin Yue ◽  
Bingbing Li ◽  
Zhaoshan Zheng ◽  
Xiangchun Meng
Keyword(s):  
The Novel ◽  
Ultrafiltration Membranes ◽  
And Performance

scholarly journals Importance of pH in Synthesis of pH-Responsive Cationic Nano- and Microgels

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 827
Author(s):  
Marco Annegarn ◽  
Maxim Dirksen ◽  
Thomas Hellweg
Keyword(s):  
Primary Amine ◽  
Strong Influence ◽  
Ph Value ◽  
Swelling Behavior ◽  
Ph Responsive ◽  
Strong Decrease ◽  
Negative Effects ◽  
Monomer Feed ◽  
Synthesis Yield

While cationic microgels are potentially useful for the transfection or transformation of cells, their synthesis has certain drawbacks regarding size, polydispersity, yield, and incorporation of the cationic comonomers. In this work, a range of poly(N-isopropylacrylamide) (PNIPAM) microgels with different amounts of the primary amine N-(3-aminopropyl)methacrylamide hydrochloride (APMH) as the cationic comonomer were synthesized. Moreover, the pH-value during reaction was varied for the synthesis of microgels with 10 mol% APMH-feed. The microgels were analyzed by means of their size, thermoresponsive swelling behavior, synthesis yield, polydispersity and APMH-incorporation. The copolymerization of APMH leads to a strong decrease in size and yield of the microgels, while less than one third of the nominal APMH monomer feed is incorporated into the microgels. With an increase of the reaction pH up to 9.5, the negative effects of APMH copolymerization were significantly reduced. Above this pH, synthesis was not feasible due to aggregation. The results show that the reaction pH has a strong influence on the synthesis of pH-responsive cationic microgels and therefore it can be used to tailor the microgel properties.

Effect of Tween 80 on morphology and performance of poly(L-lactic acid) ultrafiltration membranes

2016 ◽  
Vol 134 (5) ◽  
Author(s):  
Bin Jiang ◽  
Baoyu Wang ◽  
Luhong Zhang ◽  
Yongli Sun ◽  
Xiaoming Xiao ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Tween 80 ◽  
Ultrafiltration Membranes ◽  
And Performance

Preparation and Performance of Polysulfone Hollow Fiber Ultrafiltration Membranes

2013 ◽  
Vol 457-458 ◽  
pp. 309-312 ◽  
Author(s):  
Yang Bai ◽  
Zhen Liu ◽  
Dao Bao Sun
Keyword(s):  
Hollow Fiber ◽  
High Performance ◽  
Pure Water ◽  
Water Flux ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Membrane Structures ◽  
Ultrafiltration Membranes ◽  
Pure Water Flux ◽  
And Performance

Polysulfone (PSF) hollow fiber ultrafiltration membranes were successfully prepared by dry-wet spinning technology. Dimethylacetamide (DMAC) was used as a solvent, water was used as bore liquid and coagulation bath, polyvinylpyrrolidone (PVP) was used as polymeric additive. The effects of spinning conditions on membrane structures and properties were investigated in present study. The results indicated that with the increase of PVP concentration, pure water flux increased and developed finger-like pores were formed. High coagulation bath temperature restricted pure water flux, 30°C was the best for the preparation of high-performance ultrafiltration membranes. When the air length was 11cm, the membrane comprehensive performance was the best.

Taste masking of a drug by pH-responsive coordination polymer-coated mesoporous silica nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 109453-109459 ◽  
Author(s):  
Guang-Ming Bao ◽  
LiQi Wang ◽  
Hou-Qun Yuan ◽  
Xiao-Ying Wang ◽  
Tian-Xiao Mei ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Coordination Polymer ◽  
Alimentary Canal ◽  
Oral Drug Delivery ◽  
Ph Value ◽  
Mesoporous Silica Nanoparticles ◽  
Taste Masking ◽  
Oral Drug ◽  
Ph Responsive ◽  
Oral Drug Delivery System

We developed a simple and efficient method for fabricating a taste-masked oral drug delivery system (DDS) that regulates the release of unpleasant drug taste via the change in pH value in the physiological environment of the alimentary canal.

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