Polymer

Polymer analysis addresses molecular composition, additive content, and physical stability of materials used in packaging, coatings, and consumer goods. Challenges arise from their macromolecular nature, crosslinking, and complex additive mixtures that influence performance and recyclability.

Free Formaldehyde in Emulsion Polymers

Overview

Formaldehyde may be present in emulsion polymers as a residual monomer, stabilizer, or reaction byproduct, and its concentration directly affects product safety, odor, and performance. Excess free formaldehyde can lead to regulatory non-compliance and potential health risks, making its accurate quantification essential for quality assurance in polymer manufacturing and product formulation.

Test Methods

ASTM D5910-0

Solutions

High-Performance Liquid Chromatography (HPLC) provides a reliable and precise method for determining free formaldehyde in emulsion polymers. The analysis typically involves derivatizing formaldehyde with a reagent such as 2,4-dinitrophenylhydrazine (DNPH) or acetylacetone to form a stable, detectable compound. Using a reversed-phase HPLC column and UV detection—commonly at wavelengths around 360–380 nm—the method achieves high sensitivity, accuracy, and reproducibility. HPLC is ideal for routine monitoring, process validation, and ensuring compliance with product safety and regulatory standards.

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Phenols and Slip Additives in Polymers

Overview

Phenolic antioxidants and erucamide slip additives are commonly incorporated into polypropylene homopolymer formulations to enhance stability, processability, and surface properties. Antioxidants prevent oxidative degradation during processing and storage, while slip agents reduce friction and improve film handling. Accurate determination of these additives is essential to ensure optimal performance, consistency, and compliance with regulatory and quality specifications in polymer production.

Test Methods

ASTM D6042-09

Solutions

High-Performance Liquid Chromatography with Ultraviolet detection (HPLC-UV) provides a precise and effective method for the simultaneous determination of phenolic antioxidants and erucamide in polypropylene formulations. Using a reversed-phase C18 column, the additives are efficiently separated based on polarity differences and detected at characteristic UV wavelengths. The method offers excellent sensitivity, linearity, and reproducibility, enabling reliable quantification of additive concentrations. HPLC-UV is widely used for quality control, formulation verification, and stability assessment in polymer manufacturing and materials testing laboratories.

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SpectraLab Scientific Inc
Established in 2003,

About Us

SpectraLab Scientific is a global leader of Refurbished analytical equipment. We specialize in reconditioning equipment, integrating the best available technologies from leading manufacturers across the industry. We are committed to quality and service, delivering strong customer satisfaction. We stock over 10,000 pre-owned lab equipment, components, and mix-and-match parts for your systems.