Fibre-forming blends of polypropylene and polyethylene terephthalate

Marcinčin, Anτon; Ujhelyiová, Anna; Marcincinova, T.

doi:10.1002/1521-3900(200112)176:1<65::aid-masy65>3.0.co;2-f

Cited by 14 publications

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Section: Resultsmentioning

confidence: 99%

“…The operating variables in the dyeing process such as pH, temperature and usage of auxiliary agents affect the diffusion of dye into fibre. In most cases the rate of the reaction is determined mainly by one stage, and consequently this stage sets the order of the reaction [41][42][43]. The dyeing rate graphs for polyamide with different concentrations of cochineal (0.3 and 0.5 g l À1 ) and temperatures (80 and 100°C) are shown in Figure 5.…”

Section: Adsorption Kinetics Dyeing Rate and Diffusion Coefficientmentioning

confidence: 99%

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Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Sadeghi‐Kiakhani

Safapour

Mirnezhad

2018

Coloration Technology

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The adsorption behaviour of the natural dye cochineal on polyamide 66 was studied at different pH values. The thermodynamic and kinetic parameters such as standard affinity (−Δμ˚), changes in enthalpy (ΔH˚) and entropy (ΔS˚), diffusion coefficient and activation energy of the diffusion, were determined for pH values of 3 and 6. Results indicated that the experimental data fitted appropriately with the Nernst isotherm. Furthermore, the partitioning ratio and −Δμ˚ decreased significantly with increasing temperature, and it was revealed that the adsorption of cochineal onto polyamide was an exothermic process. The −Δμ˚ value of polyamide dyed at pH 3 was higher than that dyed at pH 6. This is related to higher numbers of electrostatic and non‐electrostatic interactions between cochineal and polyamide at pH 3, whereas at pH 6 non‐electrostatic hydrophobic interactions between cochineal and polyamide are dominant. At pH 6 comparatively higher negative values for ΔH˚ and ΔS˚ were obtained. The diffusion coefficient increased with rises in temperature. The polyamide dyed at pH 3 had a higher diffusion coefficient at every temperature than the polyamide dyed at pH 6. The dyeing rate for polyamide at pH 3 was higher than at pH 6 and reached equilibrium in a shorter time. Furthermore, a lower activation energy of diffusion was obtained at pH 3 compared to pH 6.

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Section: Resultsmentioning

confidence: 99%

Section: Adsorption Kinetics Dyeing Rate and Diffusion Coefficientmentioning

confidence: 99%

Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Sadeghi‐Kiakhani

Safapour

Mirnezhad

2018

Coloration Technology

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“…1, 9, 10 Among these additives, polyesters, especially poly(ethylene terephthalate) (PET), offer some advantages over the others, including improvements in the dyeability by the classical exhaust mechanism and improvements in the mechanical properties. 11, 12 Unfortunately, however, few studies have been carried out on optimization of the dyeability and tensile properties of PP/PET fiber‐forming blends.…”

Section: Introductionmentioning

confidence: 99%

Attaining optimal dyeability and tensile properties of polypropylene/poly(ethylene terephthalate) blends with a special cubic mixture experimental design

Mirjalili

Moradian

Ameri

2011

J of Applied Polymer Sci

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In this investigation, we attempted to enhance the dyeability of polypropylene (PP) with disperse dyestuffs without adversely affecting its tensile properties. To this end, a special cubic experimental design was used to predict the effect of variations in the properties of a tricomponent mixture composed of PP, poly(ethylene terephthalate) (PET), and maleic anhydride grafted polypropylene (PP-g-MA) on the dyeability and tensile properties of the resultant polymer blend. The results illustrate that there seemed to be critical PET content, above which the blend's dye uptake tended to remain constant, but the tensile properties were adversely affected. Further analysis of the results indicated that the PP/PET/PP-g-MA blends in which the PET and PP-g-MA contents were in the range 10-15 and 4-5 wt %, respectively, gave maximal dye uptake and desirable tensile properties.

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“…There are also some reports on the physical properties of PP with other polymers, such as poly(ethylene terephthalate),11 polyamide 6,12–17 polyamide 12,18 polyethylene,19 and phenoxy 20. The Ziegler–Natta isotactic polypropylene (ZN‐iPP)/metallocene isotactic polypropylene (m‐iPP) polyblended fiber is absent from the literature.…”

Section: Introductionmentioning

confidence: 99%

Thermal characteristics and crystallinity of Ziegler–Natta isotactic polypropylene/metallocene isotactic polypropylene polyblended fibers

Shu

Hsiao

Tsen

2009

J of Applied Polymer Sci

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Ziegler-Natta isotactic polypropylene (ZNiPP) and metallocene isotactic polypropylene (m-iPP) were extruded (in ratios of 75/25, 50/50, and 25/75) from one melt twin-screw extruder to produce three ZN-iPP/ m-iPP polyblended polymers and, subsequently, spin fibers. In this study, we examined the rheology of the ZNiPP/m-iPP polyblended polymers and the thermal characteristics and crystallinity of the ZN-iPP/m-iPP polyblended fibers using gel permeation chromatography, rheometry, differential scanning calorimetry (DSC), wideangle X-ray diffraction, density gradient analysis, and extension stress-strain measurement. The apparent melt viscosity of the ZN-iPP/m-iPP polyblended polymers revealed positive-deviation blends. The 50/50 blend of ZN-iPP/m-iPP had the highest apparent melt viscosity. For five samples, the complex melt viscosity decreased with the angular frequency, which represented typical non-Newtonian behavior. The Cole-Cole plot, which consisted of the imaginary part of the complex melt viscosity versus the real part of the complex melt viscosity plot, of the ZN-iPP/m-iPP polyblended polymers showed a semicircular relationship with the blend ratios. It indicated that the ZN-iPP/m-iPP polyblended polymers were miscible. We analyzed the shear modulus data (G 0 vs G 00 ) by plotting them on a log-log scale. The plot revealed almost the same slopes for the ZN-iPP/m-iPP polyblended polymers, which indicated a good miscibility between the ZNiPP and m-iPP polymers. The experimental DSC results demonstrate that the ZN-iPP and m-iPP polymers constituted a miscible system. The crystallinity and tenacity of the ZN-iPP/m-iPP polyblended fibers initially increased and then fell as the m-iPP content increased. Meanwhile, the 50/50 blend of ZN-iPP/m-iPP had the highest crystallinity and tenacity.

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Fibre-forming blends of polypropylene and polyethylene terephthalate

Cited by 14 publications

References 0 publications

Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Attaining optimal dyeability and tensile properties of polypropylene/poly(ethylene terephthalate) blends with a special cubic mixture experimental design

Thermal characteristics and crystallinity of Ziegler–Natta isotactic polypropylene/metallocene isotactic polypropylene polyblended fibers

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