Quantification of pentaerythritol tetrastearate, a mold release agent used in polycarbonate, by non‐aqueous RP HPLC method

Abstract

A new non‐aqueous high‐performance liquid chromatography method for the quantitative determination of mold release agent pentaerythritol tetrastearate in polycarbonate matrix has been developed and validated. The analyte calibration curve was linear over range of 0.05–0.2 mg/mL (Coefficient of determination > 0.999), with limit of detection of 0.03 mg/mL. The repeatability of method was satisfactory with relative standard deviation of 1.6%. The obtained recovery was ranging from 100–101%. Detailed high‐resolution mass spectrometric characterization of the principle peak confirmed that all the five components of pentaerythritol tetrastearate elutes as a single peak under the established chromatographic conditions. The new method is reliable and independent of any variation in composition of analyte in the samples compared to pentaerythritol tetrastearate reference standard used for calibration. The new high‐performance liquid chromatography method is robust and easy to implement in quality control laboratories for quantitative estimation of the mold release agent added in commercial polymer.

Study on synthesis and demolding performance of polyethylene glycol fatty acid mold release agents

“…Due to the friction effect, it is easy to reduce the fluidity of the melt, resulting in adverse results, such as poor processability, slow processing rate, products not easy to be filled with molds with complex shapes, rough surface, lack of luster, severe fold, et al 3–5 One of the effective methods to overcome the above two kinds of friction is to add lubricant. The release agent is a kind of external lubricant.…”