Preparation and hydrophobicity failure behavior of two kinds of fluorine-containing acrylic polyurethane coatings

RSC Advances ◽  
2015 ◽  
Vol 5 (115) ◽  
pp. 95230-95239 ◽  
Author(s):  
Fei Yang ◽  
Liqun Zhu ◽  
Dongxiao Han ◽  
Weiping Li ◽  
Yichi Chen ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Failure Behavior ◽  
Polyurethane Coatings ◽  
Modification Method ◽  
Acrylic Copolymers ◽  
Acrylic Polyurethane ◽  
Fluorine Modification

Two kinds of fluorine-containing acrylic copolymers, prepared following an in situ radical polymerization fluorine modification method and a post-polymerization fluorine modification route, respectively, achieved different failure behaviors and hydrophobicities.

Effects of fluorine and silicon components on the hydrophobicity failure behavior of acrylic polyurethane coatings

2017 ◽  
Vol 14 (3) ◽  
pp. 691-699 ◽  
Author(s):  
Fei Yang ◽  
Liqun Zhu ◽  
Dongxiao Han ◽  
Weiping Li ◽  
Yichi Chen ◽  
...  
Keyword(s):  
Failure Behavior ◽  
Polyurethane Coatings ◽  
Acrylic Polyurethane

scholarly journals Effect of Na- and Organo-Modified Montmorillonite/Essential Oil Nanohybrids on the Kinetics of the In Situ Radical Polymerization of Styrene

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 474
Author(s):  
Ioannis S. Tsagkalias ◽  
Alexandra Loukidi ◽  
Stella Chatzimichailidou ◽  
Constantinos E. Salmas ◽  
Aris E. Giannakas ◽  
...  
Keyword(s):  
Essential Oil ◽  
Radical Polymerization ◽  
Food Packaging ◽  
In Situ Polymerization ◽  
Average Molecular Weight ◽  
Monomer Conversion ◽  
Hydroxyl Groups ◽  
Modified Montmorillonite ◽  
Kinetics Of

The great concern about the use of hazardous additives in food packaging materials has shown the way to new bio-based materials, such as nanoclays incorporating bioactive essential oils (EO). One of the still unresolved issues is the proper incorporation of these materials into a polymeric matrix. The in situ polymerization seems to be a promising technique, not requiring high temperatures or toxic solvents. Therefore, in this study, the bulk radical polymerization of styrene was investigated in the presence of sodium montmorillonite (NaMMT) and organo-modified montmorillonite (orgMMT) including thyme (TO), oregano (OO), and basil (BO) essential oil. It was found that the hydroxyl groups present in the main ingredients of TO and OO may participate in side retardation reactions leading to lower polymerization rates (measured gravimetrically by the variation of monomer conversion with time) accompanied by higher polymer average molecular weight (measured via GPC). The use of BO did not seem to affect significantly the polymerization kinetics and polymer MWD. These results were verified from independent experiments using model compounds, thymol, carvacrol and estragol instead of the clays. Partially intercalated structures were revealed from XRD scans. The glass transition temperature (from DSC) and the thermal stability (from TGA) of the nanocomposites formed were slightly increased from 95 to 98 °C and from 435 to 445 °C, respectively. Finally, better dispersion was observed when orgMMT was added instead of NaMMT.

scholarly journals Bio-based polyurethane nanocomposite thin coatings from two comparable POSS with eight same vertex groups for controlled release urea

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lixia Li ◽  
Meng Wang ◽  
Xiandong Wu ◽  
Wenping Yi ◽  
Qiang Xiao
Keyword(s):  
In Situ Polymerization ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Poly Ethylene Glycol ◽  
Thin Coatings ◽  
Polyurethane Coatings ◽  
Coated Urea ◽  
Poly Ethylene ◽  
Coated Fertilizer ◽  
Polyurethane Matrix

AbstractNanocomposite modification has attracted much attention in improving properties of bio-based polymer coating material for coated fertilizer. Herein two comparable polyhedral oligomeric silsesquioxanes (POSS), with eight poly(ethylene glycol) (PEG) and octaphenyl groups attached to the cage, respectively, were successfully incorporated into thin castor oil-based polyurethane coatings via in-situ polymerization on the urea surface. The nanostructure coatings are environmentally friendly, easy to prepare, and property-tunable. The results show that the vertex group of POSS had a pronounced influence on dispersion level and interaction between polyurethane and POSS that well-tuned the release pattern and period of coated urea, even at the coating rate as low as of 2 wt%. The liquid POSS with long and flexible PEG groups had better compatibility and dispersibility in polyurethane matrix than the solid POSS with rigid octaphenyl groups, as evidenced by SEM/EDS. The unique properties were resulted from the different extents of physical crosslinkings. This modification of bio-based polyurethane coating with POSS provided an alternative method of regulating and controlling the properties of coated fertilizer.

Cross-linked polymeric ionic liquids ion gel electrolytes by in situ radical polymerization

2019 ◽  
Vol 378 ◽  
pp. 122245 ◽  
Author(s):  
Liya Chen ◽  
Jifang Fu ◽  
Qi Lu ◽  
Liyi Shi ◽  
Mengmeng Li ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Radical Polymerization ◽  
Polymeric Ionic Liquids ◽  
Gel Electrolytes ◽  
Ion Gel

Coupling Raman spectroscopy and drop tensiometry for in situ monitoring of radical polymerization in a single monomer droplet

2018 ◽  
Vol 49 (12) ◽  
pp. 2046-2049 ◽  
Author(s):  
Elise Dropsit ◽  
Jacques Desbrières ◽  
David Chapron ◽  
Sandrine Hoppe ◽  
Alain Durand ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Radical Polymerization ◽  
In Situ Monitoring ◽  
Monomer Droplet
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