J.E. Crespo

Mechanical Properties and Fracture Surface Morphology of Dehp and Dinch Based Vinyl Plastisols

Owing to the relevance of plasticized PVC in the industrial plastic transformation sector, mainly in such sectors as interior decoration (furniture, wood) toys, household goods, shoes, auxiliary sectors, etc., this material makes an interesting study subject from the perspective of quality improvement, benefits, and versatility. The present study analyzes the fracture behavior of vinyl plastisols. With this objective, a low-toxicity plasticizer derived from dicarboxilate di-isononyl-cyclohexane-1,2-dicarboxylate,- DINCH and another plasticizer derived from ftalate, diethylhexyl phthalate — DEHP, widely employed at an industrial level, albeit with toxicity problems, has been used. The basis of this study is an analysis of the effects of the DINCH and DEHP plasticizers used, and their concentration in the fracture of the plastisol in order to optimize the service response of the material. This is conducted by means of a study of the fracture morphologies of the plastisols, in order to determine the mechanisms which cause the crack and to carry out a classification of the resulting topography of the fracture. This is directly linked to the plasticizer concentration, to the type of plasticizer used, and to the mechanical response obtained from the material.

Comparative study of the presence of latex and polychloroprene in the behavior of sintered powder EPDMCR, ethylene-propylene-diene-monomer crumb rubber

In this work, the mechanical behavior of sintered waste material of ethylene-propylene-diene-monomer crumb rubber (EPDMCR) is analyzed, optimizing the temperature and compression pressure. The results obtained showed that an increase in temperature and compression pressure gives a significant improvement in the mechanical properties of the material. We later mixed the EPDMCR particles with different percentages of adhesives with the aim of further improving the mechanical performance obtained from the sintered particles. The adhesives used in this study were latex and polychloroprene, and the optimum mechanical performance obtained came from mixes with polychloroprene, using a mix with 50% adhesive. The study was concluded with an analysis of images of the material using a scanning electron microscope (SEM), in order to observe the EPDMCR–adhesive interaction.