Abstract

CAICEDO, Carolina; CRESPO-DELGADO, Lina Marcela; CRUZ-RODRIGUEZ, Hever de la  and  ALVAREZ-JARAMILLO, Norman Andrés. Thermo-mechanical properties of polypropylene: Effects during reprocessing. Ing. invest. y tecnol. [online]. 2017, vol.18, n.3, pp.245-252. ISSN 2594-0732.

In this work a transformation of random polypropylene copolymer by injection technique was carried out. For the virgin material process the corresponding variables such as temperature, pressure, velocity and residence time were established. In order to study the thermal and mechanical properties of this system. Five more generations were obtained, which allowed us to correlate the changes caused by the material thermal oxidation. The results of mechanical characterization corresponding to the analysis presented to decrease in 6.0%, for bend and 8.4% for traction. On the other hand, the thermal results showed a 13.6% loss on the fifth generation regarding the virgin material on the injection experiment; meanwhile for the thermal simulation this loss was minimal with a 3.8%. For the simulation three parameters were considered: maximum temperature, residence time and the number of cycles in the process. The thermal analysis allowed us to quantify the friction associated effects as a result of the mechanical shear and compression.

Keywords : Polypropylene; injection; thermal analysis; reprocess; mechanical properties.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )