Joan C. Ronda
Case Western Reserve University
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Featured researches published by Joan C. Ronda.
Biomacromolecules | 2009
Marta Sacristán; Joan C. Ronda; Marina Galià; Virginia Cádiz
New silicon-containing soybean-oil-based copolymers were prepared from soybean oil, styrene, divinylbenzene, and p-trimethylsilylstyrene by cationic polymerization using boron trifluoride etherate as initiator. Soxhlet extraction and NMR spectroscopy indicate that the copolymers consist of a cross-linked network plasticized with varying amounts of oligomers and unreacted oil. This soluble fraction increases when the SiST content in the feed increases, according to a lower reactivity of this monomer. The thermal, dynamomechanical, and flame-retardant properties of these materials were examined. Thermosets with glass transition temperatures ranging from 50 to 62 degrees C, which are thermally stable below 350 degrees C, and with LOI values from 22.6 to 29.7 were obtained. Their properties suggest that these materials may prove to be useful alternatives for current non-renewable-based thermosets and that the flame-retardant properties of vegetable-oil-based thermosets can be improved by adding covalently bonded silicon to the polymer.
Macromolecular Rapid Communications | 2011
Cristina Lluch; Gerard Lligadas; Joan C. Ronda; Marina Galià; Virginia Cádiz
Fast-degrading linear and branched polyanhydrides are obtained by melt-condensation of novel di- and tri-carboxylic acid monomers based on oleic and undecylenic acid synthesized using photoinitiated thiol-ene click chemistry. (1)H NMR spectroscopy, size exclusion chromatography, differential scanning calorimetry, thermogravimetric analysis, and FT-IR spectroscopy have been used to fully characterize these polymers. The hydrolytic degradation of these polymers was studied by means of weight loss, anhydride bond loss, and changes in molecular weight, showing fast degrading properties. Drug release studies from the synthesized polyanhydrides have also been conducted, using rhodamine B as a hydrophobic model drug, to evaluate the potential of these polymers in biomedical applications.
Biomacromolecules | 2017
Adrian Moreno; Diego Garcia; Marina Galià; Joan C. Ronda; Virginia Cádiz; Gerard Lligadas; Virgil Percec
Ethyl lactate (EtLa), a green and safe agrochemical solvent, is gifted with some properties that make it a good candidate for SET-LRP. It dissolves CuBr2, mediates an efficient disproportionation of CuBr in the presence of tris(2-(dimethylamino)ethyl)amine (Me6-TREN), and is capable to dissolve both aqueous (polar) and hydrocarbon (nonpolar) soluble monomers and polymers. Here, we report that EtLa is an excellent solvent for the Cu(0) wire-catalyzed SET-LRP to produce both hydrophilic and hydrophobic polyacrylates that exhibit precise chain end functionality. These results will expand the table of SET-LRP solvents with a new green member of biological origin that is also biodegradable and, therefore, are expected to contribute to continue expanding the use of SET-LRP in the field of biomacromolecules, bioconjugates, and other biology and medicine related disciplines.
Macromolecules | 1996
Virgil Percec; Bogdan Barboiu; Andreas Neumann; Joan C. Ronda; Mingyang Zhao
Biomacromolecules | 2007
Gerard Lligadas; Joan C. Ronda; Marina Galià; Virginia Cádiz
Biomacromolecules | 2006
Gerard Lligadas; Joan C. Ronda; and Marina Galià; Virginia Cádiz
Biomacromolecules | 2010
Cristina Lluch; Joan C. Ronda; Marina Galià; Gerard Lligadas; Virginia Cádiz
Macromolecules | 1996
Virgil Percec; D. Schlueter; Joan C. Ronda; G. Johansson; Goran Ungar; J. P. Zhou
Biomacromolecules | 2007
Gerard Lligadas; Joan C. Ronda; Marina Galià; Virginia Cádiz
Polymer | 2010
Marta Sacristán; Joan C. Ronda; Marina Galià; Virginia Cádiz