Polydimethylsiloxane–cellulose acetate butyrate interpenetrating polymer networks synthesis and kinetic study. Part I

Polyisobutene/polycyclohexyl methacrylate interpenetrating polymer networks

“…The rates of network formation were followed in the bulk, in real time, in the near and middle infrared (NIR and MIR) regions (7500e1800 cm À1 ) using a Bruker spectrometer (Equinox 55). The PCHMA and PIB network formations were followed by monitoring the disappearance of the HeC]C overtone absorption bands at 6167 cm À1 [15] and of the isocyanate functions at 2270 cm À1 [16], respectively, as described previously [5]. Each peak area was directly proportional to the reagent concentration (the BeereLambert law has been verified), thus the conversionetime profile was derived easily from the spectra recorded as a function of time.…”

“…For example, polyurethane/poly(ethyl methacrylate) IPNs with weight compositions (30e70) and (20e80) show only one peak on the tan detemperature curves, indicating a high degree of interpenetration between both partner networks [4]. IPNs combining a polydimethylsiloxane (PDMS) network and a cellulose acetate butyrate one (CAB) exhibit only one mechanical relaxation temperature when the formation rate of the CAB network is correctly adjusted compared with that of the PDMS network [5]. This unique transition again witnesses a high level of interpenetration.…”

Phase-Separated Interpenetrating Polymer Networks

“…The reaction kinetics and phase separations were studied for sequential IPNs in [278]. The kinetics of IPN formation was studied for IPNs based on PDMS-cellulose acetate butyrate [279]. All these and other works [280][281][282] confirm the general regularities of the reaction kinetics and its connection with phase separation in forming systems.…”

Micropatterning of Poly (N-isopropylacrylamide) (PNIPAAm) Hydrogels: Effects on Thermosensitivity and Cell Release Behavior

“…However, the degree to which microscale surface topography, such as the size and density of a micropillar surface array, affects PNIPAAm thermosensitivity has not been well studied. Furthermore, there are limited reports on the release of cells from microscale PNIPAAm hydrogel structures (32)(33)(34)(35)(36) and no studies, to the best of our knowledge, relating the effect of pillar dimensions and patterns to cell release behavior.…”