BACKGROUND AND THE PURPOSE OF THE STUDY Mechanical properties of films prepared from aqueous dispersion and organic solutions of Eudragit RL were assessed and the effects of plasticizer type, concentration and curing were examined. METHODS Films were prepared from aqueous dispersion and solutions of Eudragit RL (isopropy alcohol-water 9:1) containing 0, 10 or 20% (based on polymer weight) of ...

Phthalates are materials with a wide spectrum of industrial applications. High molecular weight phthalates are primarily used as plasticizers in the manufacture of flexible vinyl. Low molecular weight phthalates are used in personal-care products, as solvents for cellulose acetate, and in making lacquers, varnishes, and coatings [1]. A quarter of the plasticizers produced are made of di-(2-ethy...

Blends of poly(lactic acid) (PLA) and thermoplastic starch (TPS) plasticized with adipate esters (diisodecyl adipate and diethyl adipate) having different molecular weight were used to produce sheets. The calendering-extrusion process at a pilot scale was used, and the mechanical, barrier, and morphological characterization of the obtained materials were performed. The increase in the TPS conte...

This study provides an exposure and risk assessment of diundecyl phthalate (DUP), a high molecular weight phthalate plasticizer present in automobile interiors. Total daily intake of DUP was calculated from DUP measured in wipe samples from vehicle seats from six automobiles. Four of the vehicles exhibited atypical visible surface residue on the seats. Two vehicles with no visible surface resid...

Cementitious materials are an excellent example of a composite material with complex hierarchical features and random features that range from nanometer (nm) to millimeter (mm) scale. Multi-scale modeling of complex material systems requires starting from fundamental building blocks to capture the scale relevant features through associated computational models. In this paper, molecular dynamics...

Liquid polymers are used in elastomeric compounds to modify their processing and final characteristics. The material is considered as a polymeric plasticizer substitute or supplement conventional like paraffinic aromatic oils, hydrocarbon resins. Their plasticizing effect contribution the crosslinking sulfur cured SSBR mixtures studied. Aromatic oil, aliphatic resin different liquid polymers, v...

A novel method for the preparation of solvent-free poly(«-caprolactone) (PCL) microspheres from PCL/poly(ethylene glycol) (PEG) blends was developed and demonstrated. The particle size of the PCL spheres are in the range of 1 to 20 mm (mostly in the range 5–10 mm). The influences of the molecular weight of PCL, the molecular weight of PEG, the type of emulsifier, the concentration of plasticize...

Yellowing of plastic objects as a consequence chemical degradation is common heritage conservation challenge. In the case poly(vinyl chloride) elimination hydrogen chloride leads to formation polyene sequences that act chromophores. The objective this work was quantitatively evaluate rate observed yellowing, relevant room conditions during long-term storage collections. Degradation quantified i...

A method was developed to assess leaching of several poly(vinyl chloride) (PVC) plasticizers in aqueous media using gas chromatography (GC), and compared to a gravimetric standard test method (ASTM Method D1239). The GC method was a more direct measurement of plasticizer concentration in the aqueous phase. The leaching of commercial plasticizers, as well as several series of "green" candidate p...