The influence of montmorillonite on the processing and properties of anionic polyamide 6/montmorillonite composites via vacuum assisted resin infusion

Abstract

In this article, the vacuum assisted resin infusion (VARI) process was employed to prepare anionic polyamide 6/montmorillonite (APA6/MMT) nanocomposites. The ɛ‐caprolactam and MMT mixture are infused into the mold by vacuum. At the same time, the anionic polymerization of ɛ‐caprolactam proceeds all the way which results in fast viscosity rise. To make the VARI process has more practical application value, enough infusion time is necessary. Three types of MMT were chosen in this paper: Na+‐MMT, OMMT‐CTAB, and OMMT‐AUA. In order to study the effects of MMT on infusion process and material's performance, conversion, and temperature test, X‐ray diffraction analysis, transmission electronic microscopy, thermogravimetric analysis, Molau test, and mechanical test were performed. The results indicated that the OMMT‐AUA can both further improve the material's performance and has longer infusion time for VARI process. POLYM. COMPOS., 40:1481–1491, 2019. © 2018 Society of Plastics Engineers

Simultaneous enhancements of mechanical and thermal properties of monomer cast nylon via polydimethylsiloxane‐modified kaolin

“…The results of neat MC nylon, fillers, and composites are shown in Figure . All samples except the filler have two distinct peaks at 20° and 24°, which are corresponded to the α‐form crystals of nylon and are indexed as 200 and 002/202 reflections . However, with the addition of kaolin and kaolin‐PDMS, the diffraction peaks related to α‐form crystal have a slight change, and a new diffraction peak at 21.3° appears, which corresponds to the γ‐form crystals of nylon and is indexed as 001 reflection .…”

EPDM‐g‐MAH toughened bio‐based polyamide 56 to prepare thermoplastic polyamide elastomer and the performance characterization

“…The calculation method of crystallinity is shown in Equation . ΔH m is the melting enthalpy of the test sample, J/g. This value is determined by subtracting the cold crystallization peak area from the melting peak area in the DSC curve; ΔH 0 is the melting enthalpy when PA56 is fully crystallized; W polymer is the weight fraction of the polymer matrix 42 . The theoretical melting degree of PA56 is 188.7 J/g for theoretical calculation.…”

“…This value is determined by subtracting the cold crystallization peak area from the melting peak area in the DSC curve; ΔH 0 is the melting enthalpy when PA56 is fully crystallized; W polymer is the weight fraction of the polymer matrix. 42 The theoretical melting degree of PA56 is 188.7 J/g for theoretical calculation.…”

Effect of thermoplastic resin transfer molding process and flame surface treatment on mechanical properties of carbon fiber reinforced polyamide 6 composite

“…The manufacturing process of the thermoplastic resin is difficult due to the high melting temperature and viscosity, which is an obstacle to the product application and mass production of CFRTP . To solve these problems, many reactive processes for thermoplastics have been developed for liquid processes such as injection molding, resin transfer molding and infusion . These processes essentially require a low viscosity and in situ polymerization resin system that can be injected into dry fibers in the mold.…”