Rheology of nanocomposites based on layered silicates and polyamide-12

Hoffmann, Botho; Kreßler, Jörg; Stöppelmann, G.; Friedrich, Chr.; Kim, G-M Gyeong

doi:10.1007/s003960000294

Cited by 144 publications

(81 citation statements)

References 15 publications

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“…Similar results were reported in the literature for PA12/NaMMT prepared by solvent intercalation. G% slope at low frequency was 1.6 for the neat polymer and lowered to 1.4 and 1.2 for 2 and 4 wt% NaMMT loading, respectively [58]. For the two PEBA/NaMMT samples prepared at similar mineral contents (3.9 and 4.1 wt% NaMMT with and without water injection respectively) the modulus at low frequency increases drastically (more than one decade) and slope decreases (from 1.89 to 1.38) when the dispersion shifts from tactoid to intercalated/exfoliated (when water is used).…”

Section: Rheologymentioning

confidence: 85%

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Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

Touchaleaume¹,

Soulestin²,

Sclavons³

et al. 2011

Express Polym. Lett.

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Abstract. Polyether-block-amide (PEBA) /clay nanocomposites were prepared water-assisted by twin-screw extrusion. Both organomodified and pristine (i.e. purified but non-modified) montmorillonite clays were used. A high-pressure differential scanning calorimetry analysis carried out in the processing conditions demonstrated that PEBA/water blend exhibits some miscibility and that amide blocks and water behave as a single phase. In addition to a significant decrease of the melting temperature, water injected into the melt plays a key role among the filler dispersion and prevents the matrix from degradation during melt-extrusion. This process enables the compounding of pristine clay-based nanocomposites whose dispersion state is high enough for the resulting mechanical performances in tension to be at least equivalent to what is reached with organomodified clay. Effects of the nanofiller dispersion onto the macromolecules' mobility are detailed and fracture mechanisms are identified for the various structures.

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Section: Rheologymentioning

confidence: 85%

“…In particular slopes and absolute values of G% at low frequencies are indicators of the dispersion state of the nanocomposite [47,58]. In the high frequency range, the signal stands for the segmental motion of the macromolecules, which is directly linked to the molecular mass.…”

Section: Rheologymentioning

confidence: 99%

Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

Touchaleaume¹,

Soulestin²,

Sclavons³

et al. 2011

Express Polym. Lett.

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“…In the following publication (Ho mann et al 2000b) melt¯ow behavior of NC based on polyamide-12 was studied. Two types of clay were used: synthetic¯uoro-mica and mineral MMT.…”

Section: Dynamic Melt¯ow Of Nanocomposites Based On Poly-e-caprolactammentioning

confidence: 99%

“…The tests under a blanket of dry nitrogen were accompanied by the time-dependent increase of PA-6 molecular weight that had to be taken into account. The PNCs belong to the category of end-tethered nanocomposites, reported to show a complex rheological behavior (Krishnamoorti and Giannelis 1997;Ho mann et al 2000aHo mann et al , 2000bRen et al 2000;Solomon et al 2001;Galgali et al 2001). The rheological properties of polyamides are known to depend on the measurement time.…”

Section: Theorymentioning

confidence: 99%

Dynamic melt flow of nanocomposites based on poly-ε-caprolactam

Utracki

Lyngaae-Jørgensen

2002

Rheologica Acta

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“…PCL (16), polypropylene (PP) (17,18), PA-12 (19), PEG (20), poly(styrene-b-isoprene) PS-PI block copolymer (21,22), PS (23Ϫ25), etc. The values of the initial slope, gЈ or g Љ, depend on the degree of dispersion and concentration of organoclay platelets.…”

Section: Introduction Generalmentioning

confidence: 99%

Melt compounding of different grades of polystyrene with organoclay. Part 2: Rheological properties

Tanoue

Utracki

García‐Rejón

et al. 2004

Polymer Engineering & Sci

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Polystyrene‐based nanocomposites (PNC) were prepared using three grades of polystyrene (different molecular weights). The resin was melt‐compounded with 0 to 10 wt% of commercial organoclay in a co‐rotating twin‐screw extruder. Owing to thermo‐oxidative degradation the degree of dispersion was poor. The rheological properties of PNC were determined under dynamic and steady state shear as well as under extensional flow conditions. At the higher clay content, dynamic strain sweep demonstrated that the storage and loss moduli decrease continuously with an increase of strain. To characterize this nonlinear viscoelastic behavior, the Fourier‐transform rheology was applied. The low strain frequency sweep showed that the storage and loss moduli increase with organoclay content. The extracted zero‐shear viscosity data were used to calculate the intrinsic viscosity and then the aspect ratio of dispersions. In spite of nonlinear viscoelastic behavior, the time‐temperature superposition was observed in the full range of concentration. The horizontal and vertical shift factors were found to be almost independent of organoclay content and molecular weight of PS. For comparison, PNC was also prepared by the solution method. A high degree of dispersion was obtained, reflected in the aspect ratio: p = 269, to be compared with p = 16 calculated for the melt‐compounded PNC. Polym. Eng. Sci. 44:1061–1076, 2004. © 2004 Society of Plastics Engineers.

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Rheology of nanocomposites based on layered silicates and polyamide-12

Cited by 144 publications

References 15 publications

Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

Efficient one-step melt-compounding of copolyetheramide/pristine clay nanocomposites using water-injection as intercalating/exfoliating aid

Dynamic melt flow of nanocomposites based on poly-ε-caprolactam

Melt compounding of different grades of polystyrene with organoclay. Part 2: Rheological properties

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