Influence of Chemically Treated Palygorskite Over the Rheological Behavior of Polypropylene Nanocomposites

Abstract

Ingeniería Investigación y Tecnología, volumen XVI (número 4), octubre-diciembre 2015: 491-501 ISSN 1405-7743 FI-UNAM (artículo arbitrado) AbstractMelt compounding was used to prepare thermoplastic composites reinforand the control of extrusion parameters were used to promote good disper--ties of the mixture, since the melt viscoelastic behavior is sensitive to changes in the molecular structures at nanoscale and mesoscale. The palygorskite nanoclay (diameter 30 nm) was extracted from a site in the southeast of the --to evaluate the interaction between the matrix and the nano-reinforcement. The master curves of storage modulus (G'), loss modulus (G") and complex vs x ) show a change of the interfacial interaction polypropylene/palygorskite when the palygorskite was chemically

Effect of Surface Modification of Palygorskite on the Properties of Polypropylene/Polypropylene-g-Maleic Anhydride/Palygorskite Nanocomposites

“…The intrinsic nonpolar nature of PP makes it incompatible with clay fillers; the use of modified clays and compatibilizers (such as polypropylene grafted maleic anhydride [32][33][34]) is a common approach to produce PP/clay nanocomposites. A number of studies have focused on the preparation of PP/PP-g-MAH/Pal nanocomposites [35][36][37][38], but despite these efforts, the factors promoting the dispersion of Pal and improvement of the properties are not yet completely understood.…”

Specific Detection of Uropathogenic Escherichia coli via Fourier Transform Infrared Spectroscopy Using an Optical Biosensor

“…FTIR analysis of the chemical and structural compositions of the silicon supports revealed a characteristic band of silicon at 730 cm –1 , which corresponds to the vibration modes of the Si–O bonds (Figure a). Moreover, a band at 1106 cm –1 , corresponding to the stretching vibrational modes of the Si–O bonds (both bands generated by the interaction of oxygen coming in the environment with crystalline silicon), and a band at 612 cm –1 , corresponding to the stretching vibrational modes of the Si–Si bonds (Figure a), were observed. ,, Regarding the functional groups generated on the surface by the reaction with APTMS, characteristic bands at 1024 and 1109 cm –1 were attributed to the vibrational modes of the Si–O–Si bonds; these bands corresponded to the formation of siloxane bonds between the silanol groups of APTMS and were generated due to the thermal oxidation process. − Bands attributed to the C–N bending vibrational modes at 1310 cm –1 , C–H stretching vibrational modes at 1380 cm –1 , and Si–C bending vibration modes at 1445 cm –1 were observed, as well as a band attributed to the amino group N–H stretching vibrational mode at 1584 cm –1 . ,, …”