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

Zhang, Xiuqin; Zhao, Ying; Wang, Zhigang; Chen, Zheng; Dong, Xia; Su, Zhiqiang; Sun, Ping; Wang, Dujin; Han, Charles C.; Xu, Duanfu

doi:10.1016/j.polymer.2005.05.004

Cited by 27 publications

(16 citation statements)

References 24 publications

(36 reference statements)

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“…It was explained by the difference of crystallization temperature of iPP and sPP inducing a migration phenomenon and creating then composition inhomogeneity in the blend. Zhang et al [5] report similar conclusions for different compositions of iPP/sPP investigating morphology and mechanical behavior of iPP/sPP blends and fibers. However, they suggest that the amorphous phases of iPP and sPP might be partially interconnected.…”

Section: Introductionmentioning

confidence: 61%

“…c, sPP ) has been done as Equations (1) and (2): (1) (2) where $H f, iPP is the melting enthalpy of iPP (area of the melting endotherm of iPP), $H f, sPP is the melting enthalpy of sPP (area of the melting endotherm of sPP). $H [5,[23][24][25]. 'wt% iPP' and 'wt% sPP' are the mass composition of the mixture.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…It is indeed very rare under classical crystallization conditions to get stable crystalline forms (forms I or II) without defects. So, the first endotherm (at about 120°C) corresponds to the melting of defects and the second one (at about 130°C) is assigned to the melting of the polymeric chains without defects [5]. The degrees of crystallinity, !…”

Section: Dsc Analysismentioning

confidence: 99%

“…This transition is reversible because form I or II is again obtained when the applied stress is removed [4]. However, besides its excellent elastic properties sPP exhibits many disadvantages such as poor mechanical properties, very complicated polymorphism and slow crystallization rate [5,6]. Blending sPP with another material having better mechanical properties and a faster crystallization rate can be an alternative for improving processing of sPP.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the morphology of iPP/sPP blends with various compositions

Bourbigot¹,

Garnier²,

Revel³

et al. 2013

Express Polym. Lett.

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Abstract. The paper investigates the morphology and the structural properties of blends of isotactic polypropylene (iPP) and syndiotactic polypropylene (sPP) having different compositions using different techniques. Solid-state nuclear magnetic resonance (NMR) permits via appropriate sequence to measure the composition, conformation and dynamics, and intimacy of mixing of polymeric materials. Measurement of relaxation times gives information on local structure of phases with different mobility. The morphology is directly related to the structural organization of the blends. The crystallization rate decreases as a function of the sPP content. The minor component is dispersed as a nodule in the main component of the blend and it plays the role of nucleating agent on it. Besides, morphology changes occur for the composition 50/50 (wt/wt) of the blend iPP/sPP. Different phases are identified, namely free amorphous, constrained amorphous and crystalline regions which exhibit different molecular mobilities. It is also shown at the interphase matrix-nodules, the nodules create a constrained amorphous zone.

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Section: Introductionmentioning

confidence: 61%

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Section: Dsc Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of the morphology of iPP/sPP blends with various compositions

Bourbigot¹,

Garnier²,

Revel³

et al. 2013

Express Polym. Lett.

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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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