On the crystallinity and some structure/property relationships of poly(ethylene terephthalate)—poly(amide‐6,6) blends

Pillon, Lilianna Z.; Lara, J.; Pillon, D. W.

doi:10.1002/pen.760271310

Cited by 40 publications

(26 citation statements)

References 12 publications

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“…Reactively compatibilized melt blends of PLA have been studied with many different polymers [13,[31][32][33][34]. However, there are only few reports on polyamidepolyester blends utilizing a catalyst [35][36][37][38][39] (and none on PLA-PA11) to enhance interchange reactions. Titanium alkoxides are widely reported as effective catalysts for interchange reactions [26,[40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Biorenewable blends of polyamide‐11 and polylactide

Patel

Ruehle

Dorgan

et al. 2013

Polymer Engineering & Sci

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Polyamide‐11(PA11) is melt blended with polylactide (PLA) using 0.00 to 0.10 wt% titanium isopropoxide catalyst to investigate potential compatibilizing reactions. Blend properties are characterized by differential scanning calorimetry (DSC), thermogravimetric analysis, dynamic mechanical thermal analysis, and tensile and impact testing. DSC shows two separate glass transition temperatures indicating only partial miscibility. Base etching to remove PLA domains followed by field emission scanning electron microscopy confirms the two phase nature of the blends. Storage and tensile moduli of the blends increase monotonically with increasing PLA content. Interchange reactions during reactive mixing were investigated by 13C‐NMR spectroscopy but the analysis shows little evidence of interchange reactions. This is true irrespective of catalyst level and mixing time over the temperature range from 185°C to 225°C. At the upper end of the temperature range investigated, significant degradation is observed. The combined results indicate that degradation reactions dominate over compatibilizing interchain transreactions. POLYM. ENG. SCI., 54:1523–1532, 2014. © 2013 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Biorenewable blends of polyamide‐11 and polylactide

Patel

Ruehle

Dorgan

et al. 2013

Polymer Engineering & Sci

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“…Interchange reactions in PA/PET blends were promoted by the addition of a catalyst (26Ϫ29). The unoriented blends were brittle (26). The brittleness of reacted and unannealed blends (29) was attributed to the increase in the PET crystallinity induced by the presence of PA.…”

Section: Introductionmentioning

confidence: 99%

Structure and mechanical properties of polyamide‐6,6/poly(ethylene terephthalate) blends

Retolaza¹,

Eguiazábal²,

Nazábal³

2004

Polymer Engineering & Sci

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Polyamide-6,6 (PA)/poly(ethylene terephthalate) (PET) blends were obtained by direct injection molding over the whole composition range. Besides the two crystalline phases, the blends were composed of a pure amorphous PET phase, and a probably pure PA amorphous phase. The crystallinity of PA and PET did not change in the blends, although PA nucleated the crystallization of PET. The morphological heterogeneity was low because, although large particles were seen, they mostly contained many small (typically 0.3 m) occlusions. This fairly homogeneous structure is attributed to the reactions observed during melt blending. The Young's modulus and yield stress of the blends followed the rule of mixtures, in good agreement with the lack of change of the crystallinity content, specific volume and orientation of the two components of the blends when they are mixed. The ductility values were also very close to those predicted by the rule of mixtures, with an absolute synergism in the 10/90 blend indicating compatibility. This positive mechanical behavior contrasts with that observed in previous works, and is attributed to the way PET crystallizes, to the highly dispersed morphology, and to the highly amorphous character of the blends obtained in this study. The ductile nature of the blends after annealing at either 80ºC for one day or 100ºC for 30 min indicated the considerable temperature resistance of these highly dispersed and partially reacted blends. Polym. Eng. Sci

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“…It has been reported that polyester–polyamide copolymers are formed through ester–amide interchange reaction in melt blending of PET and PA 16–18. Pillon et al19, 20 characterized the ester–amide interchange reaction of PET and PA catalyzed by p ‐toluenesulfonic acid by DSC, 1 H and 13 C NMR. Watanabe et al21 reported that PBT and PA 6 were an incompatible polymer pair.…”

Section: Introductionmentioning

confidence: 99%