A method for high‐temperature exclusion chromatography of polyethylenes

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Abstract
Soft polystyrene gels compact and degrade at high temperatures. Therefore, recalibration at frequent intervals is required. Suitable solvents for swelling the gel appropriately are needed. Although the universal applicability of differential refractometry as a detector for exclusion chromatography is desirable, in certain instances, when demands are high, it has several drawbacks. Among these are its extreme sensitivity to temperature changes, the variation of refractive index with molecular weight, and the lack of sufficient sensitivity to certain polymers. The system described herein, employing infrared spectrophotometric monitoring and porous glass beads as column packing, was developed to circumvent the problems inherent in the commercially available gel permeation chromatograph.

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