Meaning
Polymer characterization measurements that represent the capability of a molecule to increase the viscosity of a solvent in which it is dissolved provide a reliable assessment of molecular weight. Measuring the intrinsic viscosity of raw materials is standard practice for quality control in thermoplastic manufacturing. This value dictates how the material will flow under heat and pressure during the molding or extrusion process.
Material Consistency
Molecular weight distribution determines the strength and flexibility of the final plastic product. A decline in intrinsic viscosity during processing indicates that the polymer chains are breaking down due to moisture or excessive heat. Monitoring this property helps ensure that incoming batches of resin meet the required structural standards.
Processing Behavior
Low viscosity allows for easier shaping but can result in brittle parts.
Quality Assurance
Scaling up a polymer extrusion line demands strict control over raw material specifications to prevent frequent processing interruptions. A fluctuation in intrinsic viscosity can alter the head pressure in the extruder, leading to variations in wall thickness or thread diameter. If a batch of material with incorrect specifications is introduced to a continuous production line, it can cause catastrophic failures during the blowing or drawing stage, resulting in massive scrap and cleanup costs.
