Different amounts of sepiolite (up to a maximum concentration of 15 phr) were added to a standard LLDPE/MH formulation, and vinyltriethoxysilane
was used as a compatibilizer as well as a crosslinking agent. The thermal stability and the oxidation induction time increased with increasing sepiolite content in the LLDPE composites. Limiting oxygen index (LOI) results indicated an increase in LOI with the addition of sepiolite, and an LOI value of 36.5% was observed with 15 phr sepiolite in the LLDPE/MH formulation. The addition of sepiolite increased the gel content and tensile strength of all samples and HKI-272 research buy lowered the elongation at break. The heat deflection, Vicat softening temperature, and hardness were also improved by the incorporation of sepiolite.
This synergistic behavior of sepiolite with MH could be used in halogen-free, flame-retardant LLDPE formulations. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 2772-2777, 2011″
“The effect of heat moisture treatment on the functional and tabletting Selleckchem SCH727965 properties of corn starch BP was investigated. Corn starch was hydrothermally modified by heat moisture treatment (HMT) at 100 degrees C, 16 h; 20% moisture level (HIC – 20), 25% moisture level (HIC – 25), and 30% moisture level (HIC – 30). The tablet formation properties were investigated using Heckel and Kawakita equation, while its tabletting properties were assessed using tensile strength, crushing strength, friability and disintegration time. The results reveal that HMT reduces the gelatinisation temperature and pasting properties of the corn starch.
However, all the starches swell as the temperature is increased, HMT of the corn starch lowered the swelling power of the starch, while the solubility profile increased. The X-ray diffractometry study reveal that the native and HMT starches maintained the characteristic ‘A’ diffraction pattern of the cereal starch with strong peaks at 15.35, 17.15, 18.2 and 23.55 angstrom. The bulk density of the starch was in the order: HIC-30 approximate to selleck inhibitor HIC-25 > HIC-20 > NaIC, with reduction in the Carr’s index, compressibility index, and Hausner’s ratio after HMT treatment. The mean yield pressure, P(y), (from Heckel analysis) which is inversely related to the ability of the materials to deform plastically under pressure, was relatively high after HMT of the corn starch. Also, the P(k) values (from Kawakita analysis), which is related to the deformability of the individual powder increased after HMT of the corn starch compacts in the following order: NaIC << HIC-20 < HIC-25 < HIC-30. The tabletting properties studied reveal a reduction in the crushing strength and tensile strength after HMT of the corn starch compacts.