Study of conditions influence on the rate of crack propagation in HDPE

Theoretical part of the thesis is aimed on the summary of material and testing parameters that influence SCG process and also the duration of FNCT test. The experimental part deals with the comparison of time to crack between two used surfactants – 2% Arkopal N110 and 10% sodium dodecylbenzenesulfonate. The temperature during the experiments was 80 °C. The acceleration of the process influenced by solution of sodium dodcelbenzenesulfonate was many times higher against solution of Arkopal. There were tested several HDPE and PP specimens to prove this phenomenon. HDPE specimens used – VB85, VL 20N, PL 10 that were made in UNIPETROL RPA and some other competitive materials were used. PP specimens were developed in labs of Polymer Institute Brno. In additional, another experimental part focuses on evolving the math definition of curves measured within FNCT tests and it is still in progress