Phase Morphology and Thermal Characteristics of Binary Blends Based on PTT and PA12

Asadinezhad, Ahmad; Yavari, A.R.; Jafari, Seyed Hassan; Khonakdar, Hossein Ali; Böhme, Frank; Häßler, R.

doi:10.1007/s00289-005-0378-1

Cited by 28 publications

(34 citation statements)

References 25 publications

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“…On the basis of the DSC results, we can conclude that PTT and PA 6I form an immiscible blend system, which is reminiscent of the PTT/PA 12 blend system. 20 Similar T g results are observed in the 2608Ctreated/mixed samples, as depicted in Figure 1(b). This is an indication that the ester-amide interchange reaction hardly occurred upon the mixing processes.…”

Section: Glass Transition Temperature and Cold Crystallizationsupporting

confidence: 81%

“…Blends of PTT with immiscible counterparts of polystyrene and polyamide-12 (PA 12) were also investigated. 19,20 More recently, the miscibility and phase behavior of the blends of PTT with polycarbonate (PC) were studied. Particularly, Lee and Woo 21 indicated that the solution-cast PTT/PC blends were inherently immiscible, but after annealing at 2608C, the blends could become miscible because of the transesterification reaction.…”

Section: Introductionmentioning

confidence: 99%

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Thermal properties and phase morphology of melt‐mixed poly(trimethylene terephthalate)/poly(hexamethylene isophthalamide) blends

Chiu

Lee

Wang

2007

J of Applied Polymer Sci

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This work examines the thermal properties and phase morphology of melt-mixed poly(trimethylene terephthalate) (PTT)/poly(hexamethylene isophthalamide) (PA 6I) blends. Two temperatures, i.e., 250 and 2608C, are used to prepare the blends, respectively. Differential scanning calorimetry results indicate the immiscible feature of the blends. It is thus concluded that the ester-amide interchange reaction hardly occurred in the PTT/PA 6I blends. Depending on the composition and mixing temperature, the crystallization ability of PTT in the blends is either enhanced or hindered. Basically, a lower PA 6I content shifts the PTT melt crystallization to a higher temperature, whereas a higher PA 6I content causes an opposing outcome. The original complex melting behavior of neat PTT becomes more regular after the incorporation of 60 wt % or 80 wt % of PA 6I. Thermogravimetry analyses (TGA) show that the thermal stability of the blends improves as the PA 6I content increases. The two-phased morphology of the blends is examined by scanning electron microscopy (SEM). Polarized light microscopy (PLM) results reveal that the PTT spherulites become coarser with the inclusion of PA 6I; only smaller/dispersed crystallites are observed in the blend with 20 wt % of PTT.

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Section: Glass Transition Temperature and Cold Crystallizationsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Thermal properties and phase morphology of melt‐mixed poly(trimethylene terephthalate)/poly(hexamethylene isophthalamide) blends

Chiu

Lee

Wang

2007

J of Applied Polymer Sci

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“…[29] Therefore, PTT has recently attracted several investigations into its characteristics either in the pure form [29][30][31][32] or blends. [33][34][35][36][37][38][39][40][41][42] Summary: Blends of poly(trimethylene terephthalate) (PTT) and polycarbonate (PC) over full composition range were prepared using a twin-screw extruder. A glycidyl methacrylate-based terpolymer was used to modify the interface of the blends.…”

Section: Introductionmentioning

confidence: 99%

Linear Viscoelastic Characteristics of Poly(trimethylene terephthalate)/Polycarbonate Blends in the Melt State

Yavari¹,

Asadinezhad²,

Jafari³

et al. 2005

Macro Materials & Eng

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Summary: Blends of poly(trimethylene terephthalate) (PTT) and polycarbonate (PC) over full composition range were prepared using a twin‐screw extruder. A glycidyl methacrylate‐based terpolymer was used to modify the interface of the blends. Morphological examinations were carried out using transmission electron microscopy (TEM) and confirmed the biphasic structure of the blends. Dynamic rheological response of the blends was recorded in the linear viscoelastic region. It was observed that addition of the terpolymer to the system increases the dynamic shear moduli and complex viscosity of the blends, which is attributed to interactions of the terpolymer at the interface of two phases leading to a restricted chain mobility of the blend components. The Veenstra model was found to be able to describe dynamic shear modulus of the PTT/PC 50/50 blend; however, for the compatibilized blend of PTT/PC 50/50, the fit is not as good as that of uncompatibilized system, which is believed to be due to formation of micelles in this system.

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“…Since being commercialized by Shell Chemicals Co., polytrimethylene terephthalate (PTT) has received much scientific attention in the pure form14–23 and blends 24–28. In the pure form, most of the attempts performed to date have been focused on the crystallization of the PTT 14–16.…”

Section: Introductionmentioning

confidence: 99%

“…However, some authors have studied other characteristics of PTT such as degradation behaviour,17–19 chemical structure,20, 21 and mechanical properties 22, 23. Several blends of PTT have also been studied with respect to their rheological properties,24, 25 miscibility,26 morphology,27, 28 chemical structure and reactions occurring in the blends 26. However, the literature on thermal degradation of PTT based blends is rare.…”

Section: Introductionmentioning

confidence: 99%

Influence of Chain Structure on Phase Behavior and Thermal Degradation of Poly(trimethylene terephthalate)/Poly(hydroxy ether) of Bisphenol‐A Blends

Farmahini-Farahani

Jafari

Khonakdar

et al. 2007

Macro Materials & Eng

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This paper describes thermal decomposition and phase behavior of binary blends composed of poly(trimethylene terephthalate), (PTT), and a phenoxy resin namely poly(hydroxy ether) of bisphenol‐A prepared via melt blending. Analysis of the SEM and DMA results revealed that except for PTT/phenoxy 90/10 sample, all PTT/phenoxy blends were homogeneous. The reactions occurring in PTT/phenoxy system and their effect on molecular weight were investigated by 1H NMR and GPC respectively. 1H NMR spectra proved that the reaction of grafting PTT on phenoxy chains occurs in the system which eventually leads to formation of cross‐linked structures in the system. It was also found that chain scission reactions are responsible for decreasing molecular weight at low temperatures, while at higher temperatures formation of cross‐linked structures increases thermal stability of the blends. Investigation on type of atmosphere (nitrogen and oxygen) showed no significant effect on the thermal stability of the blends especially at low temperatures. However, oxygen results in formation of a high‐temperature shoulder in the TGA curves. This shoulder is attributed to degradation of cross‐linked structures formed during the TGA heating scan.magnified image

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Phase Morphology and Thermal Characteristics of Binary Blends Based on PTT and PA12

Cited by 28 publications

References 25 publications

Thermal properties and phase morphology of melt‐mixed poly(trimethylene terephthalate)/poly(hexamethylene isophthalamide) blends

Thermal properties and phase morphology of melt‐mixed poly(trimethylene terephthalate)/poly(hexamethylene isophthalamide) blends

Linear Viscoelastic Characteristics of Poly(trimethylene terephthalate)/Polycarbonate Blends in the Melt State

Influence of Chain Structure on Phase Behavior and Thermal Degradation of Poly(trimethylene terephthalate)/Poly(hydroxy ether) of Bisphenol‐A Blends

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