COMPLEX MODIFICATION OF POLYPROPYLENE YARN WITH ELASTOMERS AND CALCIUM CARBONATE

This article presents the results of a study aimed at enhancing the overall performance characteristics of polypropylene (PP) yarns through a method of complex modification, with the goal of significantly improving their key functional properties. Thermoplastic elastomers (TPEs) and a mineral filler – calcium carbonate (CaCO₃) – were used as modifying agents. The main objective of the work is to improve critically important mechanical properties such as impact strength and elongation at break, as well as to increase the thermal stability of the material, while a key requirement is maintaining control over and optimizing the cost of the final composite. In the experimental part of the study, various PP composite formulations with varying contents of TPE and CaCO₃ were developed and prepared by extrusion. The resulting samples were subjected to comprehensive testing of their physical and mechanical properties in accordance with international standards. The test results clearly demonstrate that the introduction of thermoplastic elastomers into polypropylene compositions leads to a significant increase in their plasticity and impact strength. The simultaneous addition of calcium carbonate effectively contributes to an increase in the stiffness (modulus of elasticity) of the composite and a noticeable reduction in shrinkage. Particular attention in the study is given to analyzing the synergistic effect that arises from the combined use of elastomers and mineral filler. Keywords: polypropylene, thermoplastic elastomers, calcium carbonate, mechanical properties, modification, composites.