Thermal Studies of Solution Epoxidized trans-1,4-Polyisoprene

Local Structure and Dynamics of Trans-polyisoprene oligomers

Monoand poly-disperse melts of oligomers (average length 10 monomers) of trans-1,4-polyisoprene are simulated in full atomistic detail. The force-field is developed by means of a mixture of ab initio quantum-chemistry and an automatic generation of empirical parameters. Comparisons to NMR and scattering experiments validate the model. The local reorientation dynamics shows that for C−H vectors ...

Degradation of trans-polyisoprene after root filling with thermoplasticized techniques.

AIM To evaluate ex vivo degradation of gutta-percha following six thermoplastic obturation techniques. METHODOLOGY Ninety human-extracted mandibular premolars were selected and divided randomly into nine groups for filling. Group 1: thermomechanical compaction for 3 s with Konne gutta-percha points (Konne Ind. e Com. de Mat. Odontol., Belo Horizonte, MG, Brazil); Group 2: thermomechanical com...

Trans-, 14 | 2012

Synthesis and Tribological Studies of Branched Alcohol Derived Epoxidized Biodiesel

The optimization and kinetics of the ring-opening reaction of an epoxidized biodiesel (epoxidized rapeseed oil methyl ester) (EBD) with 2-ethyl hexanol (2-EH) were studied. The determined optimum conditions were 4:1 2-EH/oil molar ratio, 90 °C, 18 h, and 7 wt % of Amberlyst D001 (dry) catalyst; the product's oxirane oxygen content was 0.081% with 38.32 mm²/s viscosity at 40 °C. The catalyst ret...

Studies on the Synthesis and Characterization of Epoxidized Soybean Oil

Traditionally, polymers are synthesized from petrochemical by-products. The greenhouse gas emissions from petroleum based polymers make them unattractive options as there has been an increase in climate changes and adverse weather conditions. Additionally, they are non-degradable, creating issues when used as landfills. For these reasons and more, there is an urgent need to find an alternative ...