Dynamic mechanical study of amorphous phases in poly(ethylene terephthalate) /nylon-6 blends

Serhatkulu, T.; Erman, Burak; Bahar, İvet; Fakirov, S.; Evstatiev, M.; Sapundjieva, D.

doi:10.1016/0032-3861(95)97335-d

Cited by 44 publications

(34 citation statements)

References 15 publications

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“…The results are summarised in Figure 3 [35]. DMTA is commonly considered as the most reliable technique for the determination of Tg and for this reason it was applied to the PET/PA 6 blend subjected to drawing and annealing.…”

Section: Evidences Derived From the Behaviour Of The Amorphousmentioning

confidence: 99%

“…Again, annealing at lower temperatures, or at higher ones (240°C) but for shorter times, leads to the formation of two well-defined and spatially separated amorphous phases, giving rise to two glass transition temperatures TPET and Tg"' for the PET and PA 6 amorphous phases, tespectively (kigure 3c,d). T, = 22OoC, t , = 25 h; (e) T, = 240°C, t , = 5 h; (f) T, = 240°C, t, = 25 h [35] approach aims at the quantitative removal of the PA 6 component from the system, using formic acid as a selective solvent. After annealing for 25 h it disappears completely (Figure 3f).…”

Section: Evidences Derived From the Behaviour Of The Amorphousmentioning

confidence: 99%

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Sequential Reordering in Condensation Copolymers

Fakirov¹,

Denchev²

1999

Transreactions in Condensation Polymers

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Evidence of the occurrence of chemical interactions in blends of condensation polymersDuring recent decades, polymer blends have become of prime commercial importance [l]. Currently, they constitute over 30% of the polymer market. The blends of condensation polymers are of particular interest because of their unique ability to undergo interchange reactions (additional condensation and transreactions, called also exchange reactions or mid-chain reactions) [2]. The latter are reversible and can be performed either in the molten [2] or in the solid state (31 under appropriate conditions. Elevated temperatures between 180°C and 300°C and addition of catalysts are among the basic requirements in this respect. Although the study of transreactions started 50 years ago with the pioneer work of Flory [4], even now some details of the process are not completely understood. There is no common consent in the literature on the relative importance of the three possible mechanismsalcoholysis, acidolysis or direct ester exchange [5-121.Interchain reactions take place whenever the conditions required (appropriate temperatures and chemical compositions) are available. They occur in homopolycondensates, as can be concluded from the upgrading of molecular weight due to additional condensation; transactions have been convincingly confirmed by studying blends of protonated poly(ethy1ene terephthalate) (PET) with deuterium-labelled ( d 4 ) PET by small-angle neutron scat- Transreactions in Condensation PolymersStoyho Fahirov copyright 0 WILEY-VCH Verlag GrnbH. 1999 Evidence derived fmm the behaviour of crystalline and amor- IR study and weight control after selective extractionThe DSC and WAXS measurements described in Section 1.2 were performed with annealed PET/PA 6 blends without any further treatment. The same samples were also studied by IR spectroscopy after application of selective extraction, accompanied by weight control of the fractions. This phases phous phases

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Section: Evidences Derived From the Behaviour Of The Amorphousmentioning

confidence: 99%

Section: Evidences Derived From the Behaviour Of The Amorphousmentioning

confidence: 99%

Sequential Reordering in Condensation Copolymers

Fakirov¹,

Denchev²

1999

Transreactions in Condensation Polymers

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“…Moreover, it is able to effectively exfoliate organoclays, thus producing materials with extraordinary modulus of elasticity and stiffness. PET is a widely used engineering polymer and its blends with PA6 [6][7][8][9][10][11][12] have proven to be compatible thanks to the copolymers produced by reactions between the two components [6,8,11,12] in the melt state. Therefore, the opportunity to obtain nanocomposites (Ncs) based on a PET matrix reinforced with a dispersed phase of nanoclay modified PA6 that could also potentially offer fibrillar morphology would seem very exciting indeed.…”

Section: Introductionmentioning

confidence: 99%

Stiffening of poly(ethylene terephthalate) by means of polyamide 6 nanocomposite fibers produced during processing

Goitisolo

Eguiazábal

Nazábal

2010

Composites Science and Technology

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“…Thus, the higher storage modulus may be said to result from the effect of interface on the orientation-induced crystallization mechanism during the bicomponent fiber spinning and subsequent drawing processes. In Figure 2, the plateau, from 70 to 100°C, on the storage modulus curve of the PET fiber is assigned to the crystallization of the PET fiber, 11 would be due to the insufficient drawing (draw ratio 1.53). The draw ratio 1.7 to 1.8 may be practically sufficient condition for PET POY that was wound with the take-up speed of 3200 m/min.…”

Section: Resultsmentioning

confidence: 99%

Effects of interface on the dynamic mechanical properties of PET/nylon 6 bicomponent fibers

Choi

Kim

1999

J. Appl. Polym. Sci.

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Three types of drawn bicomponent fibers were investigated to find out the effects of interface on the crystallinity and the dynamic mechanical properties. They are in the form of side-by-side, alternating-radial, and island-sea types, and the core or island component is PET, and the sheath or sea component is nylon 6. From the results it is observed that the storage moduli of these fibers are higher and the maximum values of the loss tangent are lower than the values calculated by the Takayanagi parallel model. Also, the decrease of interfaces between the two components improves the crystallinity of the PET component in the bicomponent fibers compared with the single-component PET fiber. With the decrease in interfacial area, the maximum loss tangent decreases and the crystallinity increases at the same composition ratios. Among three types of bicomponent fibers, the side-by-side type-with the smallest interfacial area-has the highest crystallinity and the lowest maximum loss tangent.

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Dynamic mechanical study of amorphous phases in poly(ethylene terephthalate) /nylon-6 blends

Cited by 44 publications

References 15 publications

Sequential Reordering in Condensation Copolymers

Sequential Reordering in Condensation Copolymers

Stiffening of poly(ethylene terephthalate) by means of polyamide 6 nanocomposite fibers produced during processing

Effects of interface on the dynamic mechanical properties of PET/nylon 6 bicomponent fibers

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