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The advances in nebulizer technology of the evaporative light scattering detector (ELSD) for high temperature gel permeation chromatography (GPC) allowing lower operation temperatures, overcome the limitations of the differential refractive index (DRI) and infrared (IR) detectors, thus allowing xylene as solvent for evaluation of the molecular weight distributions (MWD) of polyolefins. Different types...
The study presents the possibility to replace the 1,2,4-trichlorobenzene (TCB) for the analysis by gel permeation chromatography (GPC) of low-density polyethylenes (LDPE) with dibutoxymethane (DBM, butylal), a halogen free and less toxic solvent. The molecular weight distributions and the viscosity plots were measured for commercial LDPE samples solubilized in TCB, and DBM, using a GPC system with...
The morphology of multiphase polypropylene copolymers, called impact polypropylenes, was studied by 129 Xe nuclear magnetic resonance (n.m.r.) spectroscopy. The impact polypropylenes studied were composed of polypropylene homopolymer and ethylene-propylene rubber (EPR). The xenon atom is non-polar and is soluble only in the non-crystalline regions of semicrystalline polymers. ...
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