Hybrid solid sensitive arrays/polypropylene composites: A study on sensing alkaline vapors

Abstract

Solid alkaline sensors containing polypropylene (PP) and four different bromocresol purple‐based multilayered hybrid sensitive materials (using silica and polymethacrylic acid [PPMA]) were synthesized. The material was used to sense two alkaline vapors: ammonia and volatile basic nitrogen (VBN) from fish deterioration. The sensor performances were analyzed by color evaluation, the mechanical properties were assessed by tensile tests, and the dispersion of the sensitive materials into the PP matrix was analyzed by X‐ray computed microtomography. Three of the four composites exhibited sensitivity toward ammonia vapors, with values of ∆E*ab > 5; however, the sensitive composites showed lower sensitivity toward VBN, with values of ∆E*ab < 3.5. The samples showed an elongation at break below 5%, which is characteristic of brittle materials. The X‐ray computed microtomography analysis revealed that the PMAA‐based hybrid sensor exhibited better dispersion in the PP matrix than the silica‐based sensor.

Solvent‐free synthesized zeolites as compatibility agents in FKM rubber

“…The quantification and monitoring of pore volume variation, as well packing of the inorganic material, as density increased provided some insights into the potential reasons for the performance of such materials under different processing conditions. Examples of the use of such techniques in polymer characterization can be found elsewhere 28,29 …”

“…Examples of the use of such techniques in polymer characterization can be found elsewhere. 28,29 Figure 4 shows the resulting micrographs of the evaluated systems. For each pair of images, the left image represents the pores of the matrix, while the right The efficiency of the use computerizing in a filler blend is higher than that of non-compatibilized blends.…”