Morphologies and mechanical properties of syndiotactic polypropylene (sPP)/ polyethylene (PE) blends

Loos, Joachim; Bonnet, Martin; Petermann, J.

doi:10.1016/s0032-3861(99)00092-0

Cited by 29 publications

(27 citation statements)

References 16 publications

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“…iPP as-spun fiber does not break at testing condition, meaning that its drawability is better than that of sPP and iPP/sPP fibers. The stress-strain curves of sPP and iPP/sPP fibers show usual plastic deformation via necking, which is different from HDPE/sPP blends [14]. No necking has been observed for HDPE/sPP blends, indicating that addition of HDPE is disadvantageous to sPP processing.…”

Section: Mechanical Propertiesmentioning

confidence: 84%

“…Wang [12] studied morphology development during isothermal crystallization for iPP/sPP blends, indicating iPP crystals nucleate sPP crystallization in a 50/ 50 blend and modify the sPP lamellar spacing. Petermann [13,14] investigated the morphologies and mechanical properties of sPP/HDPE blends. The results indicated that the crystallization rate of sPP increases approximately by a factor of four when blended with 1 wt% of HDPE and of more than ten when blended with 10 wt% of HDPE, and the start crystallization temperature increases more than 10 8C.…”

Section: Introductionmentioning

confidence: 99%

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Morphology and mechanical behavior of isotactic polypropylene (iPP)/syndiotactic polypropylene (sPP) blends and fibers

Zhang

Zhao

Wang

et al. 2005

Polymer

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Section: Mechanical Propertiesmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Morphology and mechanical behavior of isotactic polypropylene (iPP)/syndiotactic polypropylene (sPP) blends and fibers

Zhang

Zhao

Wang

et al. 2005

Polymer

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“…Polymer blends of sPP with other crystalline polyolefins, such as isotactic-polypropylene (iPP) [34]- [38] or polyethylene [39] [ 40], have been investigated to modify the properties of sPP. For example, the blend of sPP with iPP increased ductility of sPP.…”

Section: Introductionmentioning

confidence: 99%

Crystallization and Crystalline Structure of Syndiotactic Polypropylene and Syndiotactic-Poly(1-Butene) Blend

Naga¹,

Takagi²,

Urakami³

et al. 2014

OJPChem

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The crystallization and crystalline structure of syndiotactic-polypropylene (sPP) and syndiotactic-poly(1-butene) (sPB) blend containing 10 (Bl-10), 25 (Bl-25), 50 (Bl-50), 75 (Bl-75), and 90 (Bl-90) wt% of sPB, have been investigated by means of differential scanning calorimetry (DSC), FT-IR, and wide-angle X-ray diffraction (WAXD) analyses. The melt-crystallization behavior of the blend samples was studied by DSC on the cooling process at constant rates. Bl-50, Bl-75, and Bl-90 showed lower crystallization temperatures than the neat sPP. sPP in Bl-75 showed the lowest crystallization rate among the blend samples. Bl-90 showed a two-phase molten state, and sPP in Bl-90 crystallized via two-stepprocess. Time evolution of FT-IR spectroscopy at room temperature detected conformational transformation of the sPP polymer chain in the blend samples of Bl-50 and Bl-75. The absorption peaks intensity in the FT-IR spectra derived from the helical conformations in the crystalline phase decreased, and the planar zigzag conformations in the amorphous and mesophase phases decreased over the crystallization time. The time evolution of the WAXD profile of Bl-90 indicated that sPP in the blend accelerated the crystallization of sPB. The crystallized Bl-10, Bl-25, and Bl-50 samples showed diffraction peaks in WAXD profiles and melting endothermic peak in DSC profiles derived from only the sPP crystal. The crystallinity and melting temperature of sPP in the crystallized Bl-10, Bl-25, and Bl-50 samples were almost independent of the sPB content. Both the crystalline structure of sPP and sPB were detected in Bl-75 and Bl-90. Bl-75 showed the lowest crystallinity and melting temperature of sPP among the blend samples.

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“…[3][4][5][6][7][8] Despite some of its interesting properties, such as high ductility and high optical transparency, the syndiotactic form of PP (i.e., s-PP) has enjoyed less commercial utilization than its isotactic counterpart (i-PP). 9 Among a number of drawbacks, the slow crystallization rate of s-PP is an important factor limiting the commercial utilization of this polymer. 10 Studies related to the crystallization process of semicrystalline polymers are of great importance in polymer processing, because the resulting physical properties of the products are strongly related to the extent of crystallization and the morphology formed.…”

Section: Introductionmentioning

confidence: 99%

Rheological and isothermal crystallization characteristics of neat and calcium carbonate‐filled syndiotactic polypropylene

Supaphol

Harnsiri

2006

J of Applied Polymer Sci

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Steady-state and oscillatory shear behavior of three neat syndiotactic polypropylene (s-PP) resins and a s-PP resin (s-PP#8) filled with CaCO 3 particles of varying content, size, and type of surface modification were investigated. All of the neat s-PP resins investigated exhibited the expected shear-thinning behavior. Both the storage and loss moduli increased with decreasing temperature. The shift factors used to construct the master curves were fitted well with both the Arrhenius and the Williams-Landel-Ferry (WLF) equations. The inclusion of CaCO 3 particles of varying content, size, and type of surface modification, to a large extent, affected both the steady-state and oscillatory shear behavior of s-PP/CaCO 3 compounds, with the property values being found to increase with increasing content, decreasing size, and surface coating of the CaCO 3 particles. Lastly, the effects of melt-annealing and crystallization temperatures on isothermal crystallization behavior of s-PP#8 filled with CaCO 3 particles of varying content, size, and type of surface modification were also investigated. The half-time of crystallization of neat s-PP#8 exhibited a strong correlation with the choice of the melt-annealing temperature (T f ) when T f was less than about 160°C, while it became independent of T f when T f was greater than about 160°C. On the other hand, the half-time of crystallization of s-PP#8/CaCO 3 compounds did not vary much with the T f . Generally, the observed half-time of crystallization decreased with increasing CaCO 3 content and increased with increasing CaCO 3 particle size. Finally, coating the surface of CaCO 3 particles with either stearic acid or paraffin reduced the ability of the particles to effectively nucleate s-PP#8.

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Morphologies and mechanical properties of syndiotactic polypropylene (sPP)/ polyethylene (PE) blends

Cited by 29 publications

References 16 publications

Morphology and mechanical behavior of isotactic polypropylene (iPP)/syndiotactic polypropylene (sPP) blends and fibers

Morphology and mechanical behavior of isotactic polypropylene (iPP)/syndiotactic polypropylene (sPP) blends and fibers

Crystallization and Crystalline Structure of Syndiotactic Polypropylene and Syndiotactic-Poly(1-Butene) Blend

Rheological and isothermal crystallization characteristics of neat and calcium carbonate‐filled syndiotactic polypropylene

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