Meaning
High boiling point organic liquids facilitate the dissolution of semi-crystalline polyolefins for molecular weight distribution analysis. Using decalin extraction solvent allows for the processing of high-density polyethylene and polypropylene at temperatures near 140 degrees Celsius. Analytical procedures lose efficacy if the polymer contains cross-links that prevent total solubility.
Solvent Property
Technical grades of decahydronaphthalene offer the thermal stability required for long extraction cycles. While decalin extraction solvent possesses a high boiling point, it remains susceptible to oxidation at test temperatures. Stabilizers like butylated hydroxytoluene are added to the liquid to prevent the degradation of the polymer sample during the run.
Analytical Procedure
Samples are agitated in the heated liquid until a clear solution forms for gel permeation chromatography. Precision decalin extraction solvent use ensures that the viscosity measurements reflect the true chain length of the resin. Filters remove insoluble pigments or glass fibres that would otherwise damage the delicate columns of the instrument.
The resulting data helps moulders predict the melt flow behavior of different material lots. Precise control of the concentration prevents the clogging of the capillary tubes in the viscometer.
Safety Protocol
Laboratory environments require high-volume ventilation due to the fumes generated at elevated temperatures. Proper decalin extraction solvent management reduces the risk of fire.
