Isothermal melt crystallization and melting behaviour of syndiotactic polypropylene

Supaphol, Pitt; Spruiell, Joseph E.; Lin, J. S.

doi:10.1002/1097-0126(200011)49:11<1473::aid-pi533>3.0.co;2-9

Cited by 17 publications

(18 citation statements)

References 40 publications

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“…Figure shows that the value for T m ° is higher in case of PP of higher molecular weight as compared to that of lower molecular weight PP. A similar observation was reported by Supaphol et al , where it shows that higher molecular weight PP leads to higher value of T m °. In the present context, the value of T m ° decreases with increase in MWCNTs content in all the cases for P23Tx, P3TxD and P3Tx composites.…”

Section: Resultssupporting

confidence: 89%

Isothermal crystallization kinetics of polypropylene in melt‐mixed composites of polypropylene and multi‐walled carbon nanotubes

Banerjee

Parija

Panwar

et al. 2017

Polymer Engineering & Sci

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The isothermal crystallization behaviour of the polypropylene (PP) phase in PP/multi-walled carbon nanotubes (MWCNTs) composites has been investigated via differential scanning calorimetric analysis, which showed the influence of the varying dispersion level of MWCNTs in the respective PP matrix. PP/MWCNTs composites were prepared via melt-blending technique, wherein two different grades of MWCNTs of varying average "agglomerate" size and varying entanglements (N-MWCNTs and D-MWCNTs) were utilized. Furthermore, the influence of melt-viscosity of the PP phase was investigated on the crystallization kinetics of the PP/MWCNTs composites. Heterogeneous nucleation ability of MWCNTs has resulted in a decrease in half time of crystallization (t 1/2 ) from $14 min for pure PP to $6 min for PP/N-MWCNTs and $11 min for PP/ D-MWCNTs composites at 1 wt% of MWCNTs at 132 8C. Overall rate of crystallization (k) has significantly increased to 4.9 3 10 22 min 21 for PP/N-MWCNTs composite as compared with 6.2 3 10 23 min 21 for PP/D-MWCNTs composite at 0.5 wt% of MWCNTs at 132 8C. Moreover, the effect of a novel organic modifier, Li-salt of 6-amino hexanoic acid along with a compatibilizer (PP-g-MA) has also been investigated on the crystallization kinetics of the PP phase in PP/ MWCNTs composites.

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Section: Resultssupporting

confidence: 89%

Isothermal crystallization kinetics of polypropylene in melt‐mixed composites of polypropylene and multi‐walled carbon nanotubes

Banerjee

Parija

Panwar

et al. 2017

Polymer Engineering & Sci

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“…According to this unit cell, the characteristic X‐ray peaks should be observed at angles 2θ of about 12.2, 15.8, 20.8 and 24.5°, corresponding respectively to the reflection planes of (200), (010), (111), and (400). Comparison to isothermally crystallized neat s‐PP samples reported earlier23 suggests that the reflection onto (010) planes for non‐isothermally crystallized neat s‐PP samples (in this study) was much less pronounced.…”

Section: Resultsmentioning

confidence: 42%

Effects of calcium carbonate and its purity on crystallization and melting behavior, mechanical properties, and processability of syndiotactic polypropylene

Supaphol

Harnsiri

Junkasem

2004

J of Applied Polymer Sci

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Calcium carbonate-filled syndiotactic poly-(propylene) (CaCO 3 -filled s-PP) was prepared in a self-wiping, co-rotating twin-screw extruder. The effects of CaCO 3 of varying particle size (1.9, 2.8 and 10.5 m), content (0 -40 wt %), and type of surface modification (uncoated, stearic acidcoated, and paraffin-coated) on the crystallization and melting behavior, mechanical properties, and processability of CaCO 3 -filled s-PP were investigated. Non-isothermal crystallization studies indicate that CaCO 3 acts as a good nucleating agent for s-PP. The nucleating efficiency of CaCO 3 for s-PP was found to depend strongly on its purity, type of surface treatment, and average particle size. Tensile strength was found to decrease, while Young's modulus increased, with increasing CaCO 3 content. Both types of surface treatment on CaCO 3 particles reduced tensile strength and Young's modulus, but improved impact resistance. Scanning electron microscopy (SEM) observations of the fracture surfaces for selected CaCO 3 -filled s-PP samples revealed an improvement in CaCO 3 dispersion as a result of surface treatment. Finally, steady-state shear viscosity of CaCO 3 -filled s-PP was found to increase with increasing CaCO 3 content and decreasing particle size.

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“…It can be seen that the characteristic X-ray peaks are observed at the scattering angles 2h about 14.08, 16.98, 18.58, 21.88, and 25.58, corresponding respectively to the reflection planes of (110), (300), (130), (111), and (400). Comparison to isothermally crystallized neat PP studied by Supaphol [34] indicates that the reflection onto (010) planes for neat PP sample in our work is much less appeared.…”

Section: Crystal Structure Of Pp/mh Compositesmentioning

confidence: 58%

Effects of magnesium hydroxide and its surface modification on crystallization and rheological behaviors of polypropylene

Chen

Guo

et al. 2008

Polymer Composites

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In this article, polypropylene composites filled with magnesium hydroxide (PP filled with MH) were prepared in corotating twin-screw extruder. The effects of MH particles content and types of treatment agents on the crystallization and melting behaviors, crystal structure, and rheological properties of PP/MH composites were studied by differential scanning calorimetry (DSC), a wide-angle X-ray diffraction, and dynamic rheological measurements. The DSC results show that MH particles act as a good heterogeneous nucleation effect on PP. Surface treatment of MH weakens its heterogeneous nucleation effect. The nucleating efficiency of MH on PP is found to depend strongly on its content and type of treatment agents. The dynamic rheological behaviors of MH filled PP is found that the complex viscosity (g*) increases with increasing MH content, whereas with increasing filler concentration the network structure becomes the prevailing process, which raises the g* values, especially at the low frequency zone. The g* values of the composites, however, decrease with the addition of various treatment agents. POLYM. COMPOS.,

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Isothermal melt crystallization and melting behaviour of syndiotactic polypropylene

Cited by 17 publications

References 40 publications

Isothermal crystallization kinetics of polypropylene in melt‐mixed composites of polypropylene and multi‐walled carbon nanotubes

Isothermal crystallization kinetics of polypropylene in melt‐mixed composites of polypropylene and multi‐walled carbon nanotubes

Effects of calcium carbonate and its purity on crystallization and melting behavior, mechanical properties, and processability of syndiotactic polypropylene

Effects of magnesium hydroxide and its surface modification on crystallization and rheological behaviors of polypropylene

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