In line with the growing demand for more sustainable and efficient materials food packaging, new bifunctional pH-responsive composites were developed dual purpose of packaging indicating seafood spoilage. Within this study, a fully bio-based composite based on porous starch (PS) was prepared via microwave irradiation ( 1 g/cm3) followed by functionalization dip-coating an active solution anthocyanins-carboxymethyl cellulose (CMC). Here, edible anthocyanins (Ath) endowed excellent antioxidant...

A process for producing controlled porous epoxy thermosets is presented. It based on a two-step temperature cure: polymerization-induced phase separation at moderate (100−120 °C) of thermoplastic, poly(vinyl methyl ether) (PVME), in an epoxy−amine matrix followed by high-temperature treatment (above 200 °C). structure created the oxidative thermal degradation PVME (extraction). Different or semiporous structures with submicrometer-sized voids (dispersed closed cells, i.e., spheres open...

Abstract A new type of nanocellular polymeric material based on PMMA and a MAM triblock copolymer is presented. The production avoids the use physical additives leads to completely homogeneous nanostructured polymers with large number CO 2 nucleation sites. foamed materials show average cell sizes <200 nm relative foam densities 0.4, presenting structure. effect not measured before in demonstrated, which an increase glass transition temperature due confining chains walls foam. effects...

An environmentally friendly method to produce tunable bulk micro or nanoporous structures is presented. Nano- and micro-porous are obtained by gas dissolution foaming using CO2, following the pattern of polymer blends between poly(methylmethacrylate) (PMMA) a triblock copolymer, namely poly(methylmethacrylate)-co-poly(butyl acrylate)-co-poly(methyl methacrylate) (MAM) nanostructuration. Membranes depth filters can be produced this method, varying amount copolymer in blend. Furthermore, main...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew ferroelectric liquid crystal polysiloxanesM. Dumon, Nguyen Huu Tinh, M. Mauzac, C. Destrade, F. Achard, and H. GasparouxCite this: Macromolecules 1990, 23, 1, 355–357Publication Date (Print):January 1990Publication History Published online1 May 2002Published inissue 1 January 1990https://pubs.acs.org/doi/10.1021/ma00203a063https://doi.org/10.1021/ma00203a063research-articleACS PublicationsRequest reuse permissionsArticle...

Abstract Microcellular foaming of reinforced core/shell Polymethylmethacrylate (PMMA) was carried out by means supercritical CO 2 in a single‐step process. Samples were produced using technique based on the saturation polymer under high pressure (300 bars, 40°C), and cellular structure controlled varying depressurization rate from 0.5 bar/s to 1.6 × 10 −2 leading cell sizes 1 μm 200 μm, densities 0.8 1.0 g/cm 3 . It found that key parameter control size rate, larger rates generated bigger...

Abstract Microcellular foaming of a (methyl methacrylate)–(butyl acrylate)–(methyl methacrylate) triblock copolymer was carried out by means supercritical CO 2 in single‐step process. The experiments were performed at 40 °C using pressure 300 bar (30 MPa) during 24 h. depressurization times modified from to 30 min, leading cell sizes 10 100 µm, and relative densities 0.11 0.17. It found that the key parameter control size density time: longer generated larger lower densities. thermal...

Abstract Several new chiral liquid crystal siloxane homopolymers and copolymers have been synthesized studied as to their mesomorphic ferroelectric behaviour. Almost all of them exhibit smectic C phases over wide temperature ranges. DSC X-ray measurements are presented; spontaneous polarizations, response times tilt angles also given. Some the polarizations very high, more than 100 nC/cm2, found be among fastest for liquid-crystalline polymers, less 1 ms.

Abstract Nanocellular foaming of polystyrene (PS) and a copolymer (PS‐ b‐ PFDA) with fluorinated block (1,1,2,2‐tetrahydroperfluorodecyl acrylate block, was studied in supercritical CO 2 (scCO ) via one‐step batch process. Atom Transfer Radical Polymerization (ATRP) used to synthesize all the polymers. Neat PS PS‐ PFDA samples were produced by extrusion solid thick plaques shaped hot‐press, then subsequently foamed single‐step process using scCO analyze effect addition behaviour neat PS....

Organic polymers can be made porous via continuous or discontinuous expansion processes in scCO2. The resulting foams properties are controlled by the interplay of three groups parameters: (i) Chemical, (ii) physico-chemical, and (iii) technological/process that explained this paper. advantages drawbacks (extrusion, injection foaming) (batch foaming scCO2, will discussed article; especially for micro nano cellular polymers. Indeed, a challenge is to reduce both specific mass (e.g., ρ <...

Abstract The cure kinetics and mechanisms of an epoxy oligomer based on diglycidyl ether bisphenol A (DGEBA), polymerized with a liquid aromatic diamine diethyl toluene (DETDA 80), its blends poly(ether imide) (PEI) at concentrations 0–15 wt % were studied differential scanning calorimetry under dynamic isothermal conditions. kinetic analyses performed phenomenological approach. reaction mechanism the remained same as that neat epoxy. However, addition PEI had marked effect in DGEBA/DETDA 80...