Influence of multiwall carbon nanotubes on the mechanical properties and unusual crystallization behavior in melt‐mixed co‐continuous blends of polyamide6 and acrylonitrile butadiene styrene

Abstract

The mechanical and the crystallization behavior of melt-mixed cocontinuous blends of polyamide6 (PA6) and acrylonitrile butadiene styrene were studied in presence of multiwall carbon nanotubes (MWNT). Young's modulus was observed to be significantly improved with increasing concentration of MWNT, while only moderate improvements were observed in the tensile strength. To overcome the van der Waals' forces between MWNT a unique modifier, sodium salt of 6 amino hexanoic acid (Na-AHA) was employed where it was envisaged that specific interactions between Na + of the modifier and the delocalized ''pelectron'' clouds of MWNT would lead to significant debundlling of the tubes. The mechanical properties of the blends with Na-AHA modified MWNT were found to be improved as compared to the blends with purified MWNT however, were found to be adversely affected above certain concentration of Na-AHA in the blends. Dynamic mechanical thermal analysis supported the plasticization effect induced by Na-AHA manifesting in decrease in the glass transition temperature of PA6 in the blends with Na-AHA modified MWNT. Differential scanning calorimetry results showed two crystallization exotherms for PA6 in the blends with both purified and Na-AHA modified MWNT. This unusual crystallization behavior of PA6 was addressed in context to confined crystallization of PA6 in the tube ''network-like'' structure.

Dispersion and Performance Properties of Carbon Nanotubes (CNTs) Based Polymer Composites: A Review

“…Bose et al [37] also found a significant enhancement of melt viscosity for the blends (PA6 ce of SMA modified MWNTs. It has been also reported that, the presence of MWNTs in the compatibilizer phase led to additional increase in viscosity and storage modulus of the nanocomposites.…”

“…In addition, CNTs have very large aspect ratios, as high asautomotive industry, CNTs are used as a conducting agent to aid in electrostatic painting. Several researcher groups have reported the encouraging results regarding the possibility of introducing CNTs for mechanical property enhancement in polymer/CNTs composites [11,12]. However, the magnitude of reinforcement by CNTs is found to be limited due to the challenges involved due to the dispersion of CNTs in a molecular level or at least in the forms of "ropes" (in case of SWNTs) in polymer matrices.…”

Tough semiconductor polycarbonate/multiwalled carbon nanotubes nanocomposites by rubber modification

“…This is because it dramatically decreases upon the addition of CNTs. This is attributed [16] to the mobility restrictions that CNTs impose on the surrounding matrix chains, limiting its plastic deformation. Consequently, ascertaining which nano and micro-structures lead to tough, highly conductive NCs, is an appealing area for research.…”

Polyolefin based antibacterial membranes derived from PE/PEO blends compatibilized with amine terminated graphene oxide and maleated PE

“…26 Elongation at break is an important parameter to judge the interfacial adhesion between the phases, whereas the tensile strength of the polymer is an indication of ner morphology, domain size and size homogeneity. 31 The current studies illustrate the elaborate effect of various GO and maleated PE on the tensile strength, modulus and elongation at break. Table 1 lists the various parameters like elongation at break, tensile strength and Young's modulus of the various blends studied here.…”