Next Article in Journal
Special Issue “Real-Time Optimization” of Processes
Next Article in Special Issue
Special Issue: Water Soluble Polymers
Previous Article in Journal / Special Issue
Design of Cross-Linked Starch Nanocapsules for Enzyme-Triggered Release of Hydrophilic Compounds
Article

Comparison of Polymer Networks Synthesized by Conventional Free Radical and RAFT Copolymerization Processes in Supercritical Carbon Dioxide

1
Facultad de Química, Departamento de Ingeniería Química, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
2
Departamento de Física, Universidad Autónoma Metropolitana-Unidad Iztapalapa, Av. San Rafael Atlixco No. 186, Col. Vicentina, Ciudad de México 09340, Mexico
3
Facultad de Química, Departamento de Farmacia, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
4
Instituto Tecnológico de Tijuana, Centro de Graduados e Investigación en Química, A.P. 1166, Tijuana 22000, B.C., Mexico
*
Author to whom correspondence should be addressed.
Academic Editor: Alexander Penlidis
Processes 2017, 5(2), 26; https://doi.org/10.3390/pr5020026
Received: 3 April 2017 / Revised: 27 April 2017 / Accepted: 4 May 2017 / Published: 9 May 2017
(This article belongs to the Special Issue Water Soluble Polymers)
There is a debate in the literature on whether or not polymer networks synthesized by reversible deactivation radical polymerization (RDRP) processes, such as reversible addition-fragmentation radical transfer (RAFT) copolymerization of vinyl/divinyl monomers, are less heterogeneous than those synthesized by conventional free radical copolymerization (FRP). In this contribution, the syntheses by FRP and RAFT of hydrogels based on 2-hydroxyethylene methacrylate (HEMA) and ethylene glycol dimethacrylate (EGDMA) in supercritical carbon dioxide (scCO2), using Krytox 157 FSL as the dispersing agent, and the properties of the materials produced, are compared. The materials were characterized by differential scanning calorimetry (DSC), swelling index (SI), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Studies on ciprofloxacin loading and release rate from hydrogels were also carried out. The combined results show that the hydrogels synthesized by FRP and RAFT are significantly different, with apparently less heterogeneity present in the materials synthesized by RAFT copolymerization. A ratio of experimental (Mcexp) to theoretical (Mctheo) molecular weight between crosslinks was established as a quantitative tool to assess the degree of heterogeneity of a polymer network. View Full-Text
Keywords: supercritical carbon dioxide; RAFT polymerization; hydrogels; polymer network homogeneity; solubility in supercritical fluids supercritical carbon dioxide; RAFT polymerization; hydrogels; polymer network homogeneity; solubility in supercritical fluids
Show Figures

Graphical abstract

MDPI and ACS Style

Pérez-Salinas, P.; Jaramillo-Soto, G.; Rosas-Aburto, A.; Vázquez-Torres, H.; Bernad-Bernad, M.J.; Licea-Claverie, Á.; Vivaldo-Lima, E. Comparison of Polymer Networks Synthesized by Conventional Free Radical and RAFT Copolymerization Processes in Supercritical Carbon Dioxide. Processes 2017, 5, 26. https://doi.org/10.3390/pr5020026

AMA Style

Pérez-Salinas P, Jaramillo-Soto G, Rosas-Aburto A, Vázquez-Torres H, Bernad-Bernad MJ, Licea-Claverie Á, Vivaldo-Lima E. Comparison of Polymer Networks Synthesized by Conventional Free Radical and RAFT Copolymerization Processes in Supercritical Carbon Dioxide. Processes. 2017; 5(2):26. https://doi.org/10.3390/pr5020026

Chicago/Turabian Style

Pérez-Salinas, Patricia, Gabriel Jaramillo-Soto, Alberto Rosas-Aburto, Humberto Vázquez-Torres, María J. Bernad-Bernad, Ángel Licea-Claverie, and Eduardo Vivaldo-Lima. 2017. "Comparison of Polymer Networks Synthesized by Conventional Free Radical and RAFT Copolymerization Processes in Supercritical Carbon Dioxide" Processes 5, no. 2: 26. https://doi.org/10.3390/pr5020026

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop