1,721,091 research outputs found
Difunctionalized en-capped macromers of N-vinyl-2-pyrrolidinone as precursors of ampliphilic block copolymers
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Bioerodible hydrogels based on 2-hydroxyethyl methacrylate: synthesis and characterization.
No full textBiocompatible polymers with specific shape and tailored hydrogel properties were obtained by polymerization of mixtures of 2-hydroxyethyl methacrylate (HEMA) with 1-8 wt % ethylene glycol dimethacrylate (EGDMA) or tetra(ethylene glycol) diacrylate (TEGDA) as crosslinking agents, by using a redox initiator. Introduction of charged positive and negative groups was easily achieved by direct polymerization of appropriate monomer mixtures and by chemical transformation of preformed hydrogels. Investigation of the swelling behavior of the prepared hydrogels evidenced an appreciable dependence on both solvent type and polymer chemical structure. Additionally, the solvation process resulted in being controlled by solvent diffusion, according to a Fickian II mechanism. The presence of several types of water with different melting behavior was observed in fully swollen hydrogels
Modified Ion-exchange Sulfonic Resins: Thermostability and Catalytic Activity in Bisphenol-A Synthesis.
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Molecular, supramolecular and environmental effects on the photoswitching of side chain photochromic macromolecules
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