BS EN ISO 1628-5 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 5: Thermoplastic polyester (TP) homopolymers and copolymers

This technical specification outlines a standardized methodology for determining the viscosity of dilute polymer solutions using capillary viscometers. Specifically tailored for thermoplastic polyesters, whether they exist as homopolymers or copolymers, the document defines precise procedures to ensure accurate and reproducible results across different laboratories. The method focuses on the measurement of flow times through a calibrated capillary tube under controlled temperature conditions, which are then used to calculate intrinsic viscosity values. These values serve as critical indicators for characterizing the molecular weight and solution behavior of the polymer materials in question. The standard establishes strict requirements for sample preparation, instrument calibration, and data analysis to minimize experimental error. It provides detailed guidance on handling the thermoplastic materials to prevent degradation during testing. By adhering to the outlined steps, manufacturers and researchers can obtain reliable viscosity data essential for quality control and product development. The approach ensures consistency in the evaluation of material properties, facilitating better understanding of how these specific polymers behave in solution environments without altering the fundamental nature of the materials being tested.