Study of Catalytic Effect of Nanolayered Montmorillonite Organoclays in Epoxy Polymer

Abstract

This paper is about the study of catalytic effect of nanolayered montmorillonite-(MMT-) based organoclays (OCs) in epoxy polymer by directly monitoring their exothermic temperature versus time during curing. Untreated clays (UCs) of MMT were also filled in the epoxy polymer for comparative study. OCs and UCs were individually filled in epoxy polymer from 0 wt.% to 5 wt.%, and the curing characteristics were examined. The cure behavior of epoxy-OC composites changes as a function of OC concentration. Among the epoxy-OC systems, improved curing reaction was observed at 3 wt.% OC-filled epoxy composites. Addition of OC above 3 wt.% in epoxy reduces its catalytic effect due to presence of two types of cross-linking, namely, intergallery and extragallery cross-linking reactions. The curing behaviours of epoxy-UC composites were almost similar to those of pure epoxy polymer, and hence the results suggest that UC does not act as catalyst in epoxy polymer. The cured composite series was examined by studying their structure and morphology using X-ray diffraction (XRD), transmission electron microscopy (TEM) analysis, and the Fourier transform infrared (FTIR) spectroscopy.

Improvement of Thermal and Ablative Properties of Phenolic Resin by SiC and MMT

“…Phenolic composites with 5 wt% of SiC provided the highest tensile strength of 36.6 MPa and phenolic composites with 5 wt% of MMT provided the highest tensile strength of 35.01 MPa, compared to neat PF which offered the tensile strength of 18.56 MPa. This is due to the load can transfer efficiently from polymer matrix to reinforcing fillers [7,8] corresponding to Mohan [8] that studied on the preparation of montmorillonite-epoxy composites and he found that the addition of montmorillonite increased the tensile modulus, elongation and strength of epoxy polymer. However, when the SiC or MMT contents were more than 5 wt%, the tensile strength of the phenolic composites were constant.…”

Исследование Полимер-Силикатных Композиционных Материалов На Основе Сверхвысокомолекулярного Полиэтилена И Органомодифицированного Монтмориллонита

“…Эффективными модификаторами поверхности ММТ являются катионные поверхностноактивные вещества, родственные иону NH 4 + . Чаще всего используют четвертичные аммониевые соли (ЧАС) [10]. Однако органомодифицированные слоистые силикаты начинают разлагаться при температуре выше 200 °С, следовательно, структура ПАВ постепенно разрушается даже до пиролиза [11].…”