Morphology and mechanical properties of natural rubber latex films modified by exfoliated Na‐montmorillonite/polyethyleneimine‐g‐poly (methyl methacrylate) nanocomposites

Abstract

Na-montmorillonite/polyethyleneimine-g-poly(methyl methacrylate) (Na-MMT/PEI-g-PMMA) nanocomposite latexes were prepared by soap-free emulsion polymerization in the aqueous suspension of Na-MMT. The exfoliated morphology of the nanocomposites was confirmed by XRD and TEM. With the aim of improving morphology and mechanical properties of natural rubber latex (NRL) films, the synthesized Na-MMT/PEI-g-PMMA nanocomposites were mixed with NRL by latex compounding technology. The results of SEM and AFM analysis showed that the surface of NRL/Na-MMT/PEI-g-PMMA film was smoother and denser than that of pristine NRL film while Na-MMT was dispersed uniformly on the fracture surface of the modified films, which suggested the good compatibility between NRL and Na-MMT/PEI-g-PMMA. The tensile strength of NRL/Na-MMT/PEI-g-PMMA films was increased greatly by 85% with 10 phr Na-MMT/PEI-g-PMMA when Na-MMT content was 3 wt % and the elongation at break also increased from 930% to 1073% at the same time.The purpose of this work was to investigate the effects of Namontmorillonite/polyethyleneimine-g-poly(methyl methacrylate) (Na-MMT/PEI-g-PMMA) nanocomposites on the morphology and mechanical properties of NRL films. Na-MMT/PEI-g-PMMA nanocomposite latexes were prepared by soap-free emulsion polymerization. 23,24 An amphipathic macromolecule PEI was introduced into the gallery of Na-MMT and formed

Study on the storage performance of MG30/NRL co-blended latexes

“…NRL particles are covered with proteins (ω-terminus) and phospholipids (αterminus), which makes NRL colloidal stability [5,6]. NRL has excellent lm forming properties [7] and has been widely used in the manufacture of impregnated products such as gloves, condoms and catheters [8][9][10], but this lm has low hardness and relatively poor tear strength. In the emulsion state, using the unsaturated double bond on the surface of latex particles, MG30 is prepared by the rigid chain of containing 30% methyl methacrylate is linked to the exible chain of natural rubber, which has higher hardness and mechanical properties [11].…”

Mechanical Behavior of Polystyrene-Grafted Natural Rubber/Natural Rubber Blend: Effect of Polystyrene Grafting Percentage

“…The chemical modification by grafting with vinyl monomers can add functional groups, homopolymer chains or co-polymers onto the NR backbone, which can overcome the disadvantageous properties [3]. Various vinyl monomers such as methyl methacrylate (MMA), dimethylaminoethylmethacrylate (DMAEMA), stearyl methacrylate (SMA), styrene, and acrylonitrile are widely used to alter and improve properties of NR [4,5,6]. In particular, styrene monomer has been known to give the high levels of grafting.…”