Methodology for preparation and production of multimodal polymer materials was developed. The results were summarized in 4 patents, 2 Canadian and 2 American.
COBISS.SI-ID: 7820571
Paper shows that the time-dependent properties of polyamide may be signifiantly modified by altering the initial kinetics through the modification of the material molecular mass distribution. It was shown that the molecular weight distribution determines the time scale of material structure formation and, hence, its time-dependent properties. The melting temperature of the bimodal material is shifted for about 30oC towards higher temperatures in comparison to the conventional monomodal PA6. Multimodallity also improves the time and temperature dependence of the mechanical properties of PA6.
COBISS.SI-ID: 9552411
This chapter presents a critical review of models proposed to describe the effect of temperature and/or pressure on time-dependent thermo-rheologically and/or piezzo rheologically simple polymeric materials. The emphasis here is on the theoretical aspects, although experimental results are used as illustations wherever appropriate.
COBISS.SI-ID: 8715803
Paper describes a novel measuring system for investigating the influence of pressure adn temperature on the mechanical properties of time-dependent polymer materials. The system can measure the volume and the shear relaxation moduli of solid polymer specimens simultaneously subjected to temperatures from -50 to +120 oC, with a precision of +- 0,01 oC, and pressures from atmosferic to 500MPa, with a precision of +-1MPa. In the paper are also demonstrated measuring capabilities of the apparatus.
COBISS.SI-ID: 9497627
Paper presents results on analysis of time-dependent behavior of dinamically loaded elastomeric products. For this purpose the constitutve model has been developed, which enables analysis of the strain accumulation process of elastomeric products exposed to tooth-like periodic loading. Developed analytical model allows prediction of durability of elastomeric products that are exposed to the dynamic loading. The model was used in the optimization of drive belts in automotive applications.
COBISS.SI-ID: 9871387