Supercritical carbon dioxide-assisted process in synthesis of polymer/clay melt

Short Review on Recent Trends in Dispersing Nanoclay Particles into Polymer Matrices Using Supercritical Carbon Dioxide

“…Nanocomposites are currently being used in a number of fields, and new applications are continuously being developed including mechanical and biomaterial devices, as well as various in solar and fuel cells applications. [2] Nanosensors can be used to prove the presence of contaminants, microtoxins and microorganisms in food. [1] Generally, the synthesis of polymer nanocomposites are done using solution chemistry, and this may raise serious concerns regarding air and water pollutions.…”

“…ScCO2 has been used in several studies as a medium of clay dispersion in polymer matrix by providing a solvent-free fabrication route for nanocomposites. [2] Well dispersion or intercalation/exfoliation of nanoscale fillers (such as nano-CaCO3 and nano-clay) in polymer matrix is currently not easy to be achieved. Supercritical carbon dioxide (ScCO2) has been reported to have great potential for facilitating the dispersion or intercalation/exfoliation of the nanoscale fillers in polymer matrix.…”

“…It acts as a plasticizer, which modifies viscosity and interfacial properties of the polymer drastically. [2] Dispersed polymer/clay nanocomposites are of great interest because they can significantly improve the properties of existing polymeric materials. However, achieving a high level of clay dispersion has been a key challenge in the production of polymer/clay nanocomposites.…”

In‐situ modification of nanodiamonds by mercapto‐terminated silane agent for enhancing the mechanical interfacial properties of nitrile butadiene rubber nanocomposites

“…The most commonly used is surface modification of fillers by introducing covalently linked organic functional groups . Other methods include homogeneous dispersion of fillers in the matrix to equilibrate the stress distribution , and introduction of non‐covalent linkages including ionic and hydrogen bonds . For covalent modification, silane coupling agents with active groups at both ends are generally used as compatibilizers to connect the filler and matrix molecules, which hinder the sliding of polymer molecules from the filler.…”

Poliésteres dendríticos: aplicações em sistemas de <i>drug delivery</i> e magnificação de efeito catalítico

“…A integração deste pico permitiu, então, a determinação do número de grupos acetilas reagidos com a macromolécula. Os espectros de 1 H RMN revelaram um DSC dos dendrímeros modificados com cadeias lineares de polilactato O meio pressurizado tinha por objetivo o rebaixamento do ponto de fusão dos materiais estudados, propriedade esta muito explorada na indústria de polímeros (HASHIM;YUSOH, 2015;NALAWADE;PICCHIONI;JANSSEN, 2006;SAUCEAU et al, 2011). A molécula de CO2 se intercala nas cadeias poliméricas, permitindo que estas passem a ter uma mais facilitada movimentação, passando a requerer uma menor energia térmica para fusão.Os resultados de expansão e contração volumétrica (Figuras 2.27-2.30) demonstram que o tamanho da cadeia linear é um importante fator no tocante a interação com o scCO2.…”