Theory of compartmentalised free-radical polymerisation reactions. Part 1

1977 ◽  
Vol 73 (0) ◽  
pp. 1998
Author(s):  
David T. Birtwistle ◽  
David C. Blackley
Keyword(s):  
Free Radical ◽  
Radical Polymerisation

Design and Preparation of Synthetic Hydrogels by Redox Initiation via Free Radical Polymerisation for Biomedical Use as Wound Dressings

2012 ◽  
Vol 506 ◽  
pp. 315-318 ◽  
Author(s):  
C. Witthayaprapakorn ◽  
Robert Molloy
Keyword(s):  
Aqueous Solution ◽  
Free Radical ◽  
Transmission Rate ◽  
Ferrous Sulphate ◽  
Wound Dressings ◽  
Redox Initiation ◽  
Degree Burn ◽  
Radical Polymerisation ◽  
Moist Environment ◽  
Synthetic Hydrogels

Design and preparation of synthetic hydrogels for biomedical use as wound dressings were studied. A partially hydrated hydrogel of sodium salt of 2-acrylamido-2-methylpropanesulfonic acid (Na-AMPS) was prepared by redox initiation via free radical polymerisation in aqueous solution. In this reaction, of 40% w/v Na-AMPS aqueous solution was prepared, with 1.0% by mole of monomer ethylene glycol dimethacrylate (EGDM) as crosslinker, and potassium persulfate (K2S2O8) as the free radical initiator at a concentration of 0.5% mol monomer with potassium metabisulfite (K2S2O5) and ferrous sulphate (FeSO4) as coinitiator. The results showed that the hydrogel sheets gave good coherency, transparency, flexibility, high oxygen permeability, good skin adhesion and were non-toxic. The water properties of the hydrogel sheets (absorption, retention, water vapour transmission rate) were balanced which can maintain the moist environment of the wound. It is concluded that Na-AMPS hydrogels have properties which show potential for biomedical use as a wound dressing for second degree burn.

The application of spatially restricted geometries as a unique route to produce well-defined poly(vinyl pyrrolidones) via free radical polymerisation

2019 ◽  
Vol 55 (45) ◽  
pp. 6441-6444 ◽  
Author(s):  
Magdalena Tarnacka ◽  
Paulina Maksym ◽  
Andrzej Zięba ◽  
Anna Mielańczyk ◽  
Monika Geppert-Rybczyńska ◽  
...  
Keyword(s):  
Free Radical ◽  
Green Synthesis ◽  
Vinyl Pyrrolidone ◽  
Metal Free ◽  
Radical Polymerisation ◽  
Linear Poly ◽  
Poly Vinyl Pyrrolidone

We report the metal-free green synthesis of linear poly(vinyl pyrrolidone) of well-defined properties via free-radical polymerisation performed under confinement.

scholarly journals Synthesis and Properties of Thermosets from Tung Oil and Furfuryl Methacrylate

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 258 ◽  
Author(s):  
Sunanda Sain ◽  
Dan Åkesson ◽  
Mikael Skrifvars
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Free Radical ◽  
Raw Materials ◽  
Mechanical Analysis ◽  
Diels Alder ◽  
Tung Oil ◽  
Radical Polymerisation ◽  
High Degree ◽  
Ftir And Raman Spectroscopy

This work focuses on the development of cross-linked polymer from a highly unsaturated vegetable oil, tung oil (TO) and a bio-based acrylate, furfuryl methacrylate (FMA). The presence of a high degree of unsaturated carbon-carbon bonding in TO makes it a suitable precursor for polymer synthesis. Using this advantage of TO, in this work, we have synthesised a cross-linked polymer from TO and FMA through free radical polymerisation followed by Diels–Alder (DA) reaction. Successful incorporation of both of the raw materials and the two chemical reactions was shown using Fourier-transform infrared (FTIR) and Raman spectroscopy. The development of cross-linked structure was analysed through thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA).

scholarly journals Nanocomposites with functionalised polysaccharide nanocrystals through aqueous free radical polymerisation promoted by ozonolysis

2016 ◽  
Vol 135 ◽  
pp. 256-266 ◽  
Author(s):  
E. Espino-Pérez ◽  
Robert G. Gilbert ◽  
S. Domenek ◽  
M.C. Brochier-Salon ◽  
M.N. Belgacem ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Polymerisation
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