In situ synthesis of nanoclay filled polyethylene using polymer supported metallocene catalyst system

Abstract

Recebido em 30/8/10; aceito em 4/3/11; publicado na web em 12/5/11In situ ethylene polymerizations were performed using bis(cyclopentadiene)titanium dichloride supported on polyethersulfone as catalyst. The bis(cyclopentadiene)titanium dichloride supported on polyethersulfone catalyst activity estimated by ethylene polymerization was 360 kgPE/molTi/h. During polymerization the fillers used were montmorillionite nanoclays having surface modifications with 35-45 wt% dimethyl dialkyl(14-18)amine (FA) and 25-30 wt% trimethyl stearyl ammonium (FB). These fillers were pretreated with methylaluminoxine (MAO; cocatalyst) for better dispersion onto the polymer matrix. The formation of polyethylene within the whole matrix was confirmed by FTIR studies. It was found that the nature of nanofiller did not have any remarkable effect on the melting characteristics of the polymer. TGA study indicates that nanoclay FB filled polyethylene has higher thermal stability than nanoclay FA filled polyethylene. The melting temperature of the obtained polyethylenes was 142 °C, which corresponds to that synthesized by the polyether sulfone supported catalyst.

High-Pressure Methane, Carbon Dioxide, and Nitrogen Adsorption on Amine-Impregnated Porous Montmorillonite Nanoclays

“…FTIR analysis of all the samples conclude that various amine functional groups have been impregnated onto the structure. Further, a detailed FTIR analysis of modified nanoclay materials, with results identical to our results, can be found in the literature …”

“…Further, a detailed FTIR analysis of modified nanoclay materials, with results identical to our results, can be found in the literature. 15 Thermal stability investigation was carried out with PerkinElmer Pyris 6 TGA apparatus, for which the materials were heated under a N 2 blanket from 30 to 800 °C with 5 °C/ min heating ramp and results are given in Figure 2. Thermal analysis showed that the nonmodified nanoclay sample was stable up to 300 °C; however, there was a 5% loss in the materials weight, which was mainly attributed to the stored water in the materials.…”