Influence of carbon nanotubes with different functional groups on the morphology and properties of PPO/PA6 blends

Abstract

Carbon nanotubes with different functional groups were prepared and then incorporated into the poly(2,6-dimethyl-1,4-phenylene oxide)/polyamide 6 (PPO/PA6) blend via melt blending. The influence of different carbon nanotubes on the morphology and properties of the blend was studied. The results show that addition of pristine CNTs, CNTs-OH, CNTs-NH 2 leads to the evolution of the phase structure of PPO/PA6 (mass ratio: 60/40) blend from sea-island to cocontinuous, whereas incorporation of CNTs-COOH does not change the blend morphology due to serious aggregation of the carbon nanotubes. Incorporating different CNTs into PPO/PA6 blend increases the tensile modulus and storage modulus of the blends, whereas decreases slightly the tensile strength. At the same time, the glass transition temperatures (T g ) of PA6 and PPO are enhanced. DT g , the gap between the T g of PA6 and PPO, decreases with the addition of carbon nanotubes due to the stronger interaction of carbon nanotubes with PA6 than PPO. A similar tendency was found in the storage modulus (G 0 ) and complex viscosity (g*) of the composites. The dispersion state of different carbon nanotubes and their interaction with polymer components are different, which causes the different confinement effect to the macromolecular chains.

Super toughening of the poly(l-lactide)/thermoplastic polyurethane blends by carbon nanotubes

“…The formation of the cocontinuous morphology in the immiscible polymer blends induced by selectively localized CNTs has been also reported elsewhere. 35,[46][47][48]…”

Morphology related bulk and surface mechanical properties of ultralow diameter VGCF–iPP monofilament nanocomposites under potential confinement conditions

“…[15][16][17] The recent scientific literature already offers a range of examples of how nanoparticles, by surface interactions and confinement under different conditions, affect the morphology of the polymer matrix and in turn the properties of the nanocomposites. 9,[18][19][20][21][22][23][24] A correlation between molecular orientation in polymer nanocomposite structures to the confined morphology and structure that link to axially enhanced properties has been established recently. The extent of molecular confinement can be manipulated by filaments draw speed and by introducing nanofillers to the system (e.g.…”

Morphology and Properties of Poly(2,6-dimethyl-1,4-phenylene oxide)/Polyamide 11 Hybrid Nanocomposites: Effect of Silica Surface Modification

“…The phase structure of the blend changed from sea-island to co-continuous for hydroxylated and amino-functionalized nanotubes. However, the incorporation of carboxylated nanotubes did not change the blend morphology due to the strong aggregation of the nanofiller [ 18 ].…”

“…Blends of PPO and fully bio-based but non-biodegradable polyamide 11 (PA11) are of interest as high-performance materials with great environmental benefits. PPO offers high dimensional and thermal stability, and PA11 shows high chemical and UV resistance, and low melt viscosity [ 18 , 19 ]. It is well known that PPO is incompatible with polyamides, which results in deterioration in impact and tensile strength [ 14 , 16 ].…”