Flowability and Mechanical and Thermal Properties of Nylon 6/Ethylene bis-Stearamide/Carboxylic Silica Composites

Abstract

Nylon 6 (PA 6)/ethylene bis-stearamide (EBS)/SiO 2 -carboxylic acid-functionalized silica nanoparticles (COOH) composites were prepared by in-situ polymerization of caprolactam. SiO 2 -COOH was used to enhance the compatibility between SiO 2 and PA 6 matrix. For comparison, pure PA 6 and PA 6/EBS composites were also prepared via the same method. The PA 6/EBS/SiO 2 -COOH composites with low content of EBS and SiO 2 -COOH had greater melt-flow index (MFI) (the value of MFI increased by 50%-80%) than the pure PA 6. The results of mechanical properties showed almost no decrease in the tensile strength of PA 6/EBS/SiO 2 -COOH composites, with the bending strength decreasing by 17%-21%. However, the Izod impact strength of the PA 6/EBS/SiO 2 -COOH composites was greatly improved compared with pure PA 6, which indicated that the toughness of PA 6/EBS/SiO 2 -COOH had been greatly improved. The morphology of Izod impacted fractured surfaces of PA 6/EBS/SiO 2 -COOH was observed by scanning electron microscopy. The results revealed that the PA 6/EBS/SiO 2 -COOH composites presented a typical ductile fracture behavior with large amounts of long and large strip-like cracks. When the content of SiO 2 -COOH was 0.2 wt%, the SiO 2 -COOH particles were uniformly dispersed over the entire body of the PA 6 matrix. The results from differential scanning calorimetry indicated that the melting point (T m ), degree of crystallinity (X c ), and crystallization temperatures (T c ) of PA 6/EBS/SiO 2 -COOH composites were lower than the pure PA 6.

Crystallization of Polylactic Acid with Organic Nucleating Agents under Quiescent Conditions

“…It is derived from the reaction of ethylenediamine with two molecules of stearic acid, resulting in a long-chain amide compound. However, EBS has not been widely recognized as nucleating agents for PLA and other biopolymers [42,43]. Harris et al reported that 2% of EBS increased the crystallization of PLA3001D from NatureWorks to 18% compared to 10% for neat PLA.…”

Synthesis and characterization of enhanced conductivity acrylonitrile‐butadiene‐styrene based composites suitable for fused filament fabrication

“…Indeed, EBS has been used to improve dispersion of functionalized silica and nanoclays. [ 57,58 ] Besides, Sn was added to these composites to provide a better connection among these particles. The improvement in connectivity of fillers network in composites containing Sn is reported in several works either by direct addition, [ 59 ] or by supplementary inclusion of low melting point Sn alloys.…”

Compósitos de poliamida-6 e fibras de celulose branqueada e semi-branqueadas preparados por extrusão

“…Para tal, foi escolhido o etileno bis(estearamida) (EBS), um tipo de ácido graxo amplamente empregado como lubrificante interno ou externo na indústria de polímeros. 70 A ação lubrificante do EBS pode ser evidenciada pelo aumento do MFI com sua adição, passando de 23 (± 1) g 10 min -1 na PA-6 pura para 32,6 (± 0,8) g 10 min -1 na formulação PA6EBS.…”