Properties of Halloysite Nanotube (HNT) Filled SMR L and ENR 50 Nanocomposites

Abstract

Various HNTs loading filled SMR L and ENR 50 were prepared. Addition of HNTs caused increments in scorch time, cure time, tensile modulus, and thermal stability of nanocomposites. Optimum tensile strength of nanocomposites was achieved at 20 phr loading. Elongation at break, swelling percentage, and fatigue life decreased with increasing HNTs loading. ENR 50 nanocomposites show shorter scorch time, longer cure time, and lower curing rate index than SMR L nanocomposites. ENR 50 nanocomposites also show higher tensile modulus and thermal stability than SMR L nanocomposites. SEM images show that HNTs can be dispersed more uniformly at lower filler loading.

Nanocomposites of NR/SBR Blend Prepared by Latex Casting Method: Effects of Nano-TiO2 and Polystyrene-Encapsulated Nano-TiO2 on the Cure Characteristics, Physical Properties, and Morphology

“…For the nTiO 2 -filled rubber nanocomposites, 90 increased by 3.2 and 3.6 min with increasing TiO 2 contents to 3 phr and 5 phr, respectively, compared to that of the neat NR/SBR blend. This is attributed to the absorption of accelerator by the -OH groups on the nTiO 2 surface, which consequently lowered the accelerator activity and slowed down the sulfur vulcanizing reaction, resulting in the delayed 90 of the nanocomposites [15,29]. The existence of the surface -OH groups was previously confirmed by the FT-IR analysis.…”

Mechanical properties, thermal behaviors and oil resistance of epoxidized natural rubber/multiwalled carbon nanotube nanocomposites prepared via in situ epoxidation

“…were obtained from the rheograph. From these data, the curing rate index (CRI), which is a measure of the rate of the cure reaction, was then calculated from equation (3) 25,28 ;…”

“…This is attributed to the absorption of the basic accelerator on the carboxyl groups of the MWCNT surface, and so the delayed t s2 and t 90 of the nanocomposites. 17,26,28,34 However, at 2.5 phr MWCNTs, the t s2 and t 90 values decreased owing to the agglomeration of the MWCNTs that masked some of the carboxyl groups and so lowered the amount of accelerator absorption.…”

“…The ENR containing organoclay with primary amine modification had the fastest curing and highest mechanical properties. Ismail et al 28 reported the filling of ENR-50 with halloysite nanotubes increased the scorch time (t s2 ), cure time (t 90 ), tensile modulus, and thermal stability of the nanocomposites. Shanmugharaj and Ryu 17 used aminopropyltriethoxysilane (APS)-grafted multiwalled carbon nanotube (MWCNT) as a nanofiller for ENR to increase the ENR-MWCNT interaction.…”