Estudo das propriedades mecânicas, reológicas e térmicas de nanocompósito de HMSPP (polipropileno com alta resistência do fundido) com uma bentonita Brasileira

Abstract

This work concerns to the study of the mechanical, thermal and rheological behavior of the nanocomposite HMSPP-high melt strength polypropylene (obtained at a dose of 12.5 kGy) and a Brazilian bentonite clay from State of Paraiba (PB), known as "Chocolate" in concentrations of 5 and 10 % by weight in comparison with one American clay, Cloisite 20A. The compatibilizer agent based on maleic anhydride grafted polypropylene, known as PP-g-MA, was added at 3 % weight concentration through the melt intercalation technique using a twin-screw extruder, and afterwards, the specimens were prepared by injection process. The mechanical behavior was evaluated by strength, flexural strength and impact tests. The thermal behavior was evaluated by the differential scanning calorimetry (DSC) and thermogravimetry (TGA). The rheological behavior was evaluated in parallel-plate rheometer. The morphology of the nanocomposites was studied by the technique of scanning electron microscopy (SEM). The organophilic bentonite and the nanocomposites were characterized by X-ray diffraction (XRD) and infrared (FTIR). Results of mechanical tests showed a 9 % increase in the tensile strength and Young's modulus for the nanocomposites HMSPPC, with Cloisite 20A clay. The nanocomposite HMSPPB 10 %, with "chocolate" clay obtained a 50 % increase in the impact strength in the izod impact test.

Estudos de caracterização dos novos depósitos de argilas esmectíticas do município de Sossego, PB

“…O total de componentes que não são argilominerais nas argilas dificilmente é inferior a 10% em massa. Tais componentes apresentam cores variadas, tais como: branco, cinza, amarelo, marrom, verde e azul [3][4][5][6][7]. Tecnologicamente as argilas esmectíticas são geralmente denominadas bentonitas, podendo ser consideradas como qualquer argila constituída por argilominerais do grupo da esmectita.…”

Uso De Argila Organofílica Como Aditivo Nucleante Para Polipropileno

“…No híbrido HFMPTH é possível que o efeito cisalhante e a maior temperatura empregada durante o processamento (máxima de 206ºC para os híbridos HFC20A, HFMPH e 211ºC para o híbrido HFMPTH) tenham promovido à destruição dos aglomerados de argila permitindo a entrada das cadeias poliméricas entre as camadas da argila, auxiliando no processo de intercalação/esfoliação. Os resultados estão de acordo com os reportados na literatura para estudos semelhantes [16][17][18][19]. é que a carga inorgânica pode favorecer ao empilhamento ou ao ordenamento das cadeias de PP para o crescimento dos cristalitos [21].…”

Construction of a plastomer for the analysis of polypropylene fluidity under different temperatures and use of additives

“…In Figure 2 we have the configuration of its polymeric chain. [5] Fig.2 Molecular structure Source - [5] Polypropylene is produced from the polymerization of propene, a gaseous by-product of oil refining, in the presence of a catalyst and under controlled conditions of pressure and temperature. [6] Polypropylene has excellent electrical and insulating properties, chemical inertia and resistance to moisture typical of non-polar hydrocarbon polymers.…”