Preparation and β-crystallization of zeolite filled isotactic polypropylene composites

Jiang, Juan; Gu, Li; Liu, Hao; Ding, Qian; Mai, Kancheng

doi:10.1016/j.compositesa.2012.10.002

Cited by 13 publications

(7 citation statements)

References 43 publications

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“…iPP has been studied extensively for its polymorphic characteristics and crystallization behavior, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] since the formation of specific crystalline forms (α, β and γ, or smectic) can affect the macroscopic behavior quite dramatically. iPP has been studied extensively for its polymorphic characteristics and crystallization behavior, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] since the formation of specific crystalline forms (α, β and γ, or smectic) can affect the macroscopic behavior quite dramatically.…”

Section: Introductionmentioning

confidence: 99%

The influence of glass fibers on the morphology of β-nucleated isotactic polypropylene evaluated by differential scanning calorimetry

Janevski

Bogoeva‐Gaceva

2015

JSCS

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The presence of fillers/fibers can significantly affect the polymorphic behavior of semi-crystalline polymers. The influence of glass fibers on morphology of β-nucleated isotactic polypropylene (iPP) during isothermal and nonisothermal crystallization was analyzed in detail by differential scanning calorimetry (DSC), and the kinetics and thermodynamic parameters were determined for the systems containing 10-60 % glass fibers. The presence of glass fibers in the model composites with β-iPP had an insignificant effect on the morphology of the polymer. Thermodynamic and kinetics parameters of crystallization of iPP in model composites were similar to those obtained for the nucleated polymer. The relative content of β-crystalline phase was slightly affected by increasing glass the fiber content from 10 to 60 mas. % due to appearance of α-crystallites. Moreover, the stability of the β-crystalline phase was decreased with increasing glass fiber content and there appeared a certain amount of β 1 and β 2 phases, which are known to be disposed to recrystallization.

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Section: Introductionmentioning

confidence: 99%

The influence of glass fibers on the morphology of β-nucleated isotactic polypropylene evaluated by differential scanning calorimetry

Janevski

Bogoeva‐Gaceva

2015

JSCS

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“…These results can be explained from the perspective of nucleation. The movement of the iPP chains were induced by the addition of the nucleating agent NA11 so that a partial crystalline phase was initially formed to promote crystallization of the subsequent iPP molecules, accelerating the whole crystallization process . The dispersion of the nucleating agent NA11 was promoted by Z4A, providing more nucleation sites and therefore reducing the activation energy.…”

Section: Resultsmentioning

confidence: 99%

“…induced by the addition of the nucleating agent NA11 so that a partial crystalline phase was initially formed to promote crystallization of the subsequent iPP molecules, accelerating the whole crystallization process. 17,23,26 The dispersion of the nucleating agent NA11 was promoted by Z4A, providing more nucleation sites and therefore reducing the activation energy. Furthermore, the low activation energy value of −280.3 kJ/mol obtained for NA11-Z4A/iPP indicates that the effect of NA11-Z4A on the improvement in the nucleation process if iPP is much stronger than those of NA 11 alone and NA11/Z4A.…”

Section: Nonisothermal Crystallization Kineticsmentioning

confidence: 99%

“…It may be used as the dispersion supports of nucleating agents. Several researchers investigated the significant effects of zeolite particles on the crystallization behavior of PP as a filler . Metin et al found that PP composites containing 2 to 6 wt% natural silica‐alumina zeolite with three nonionic surface modifiers obtained a significant improvement in the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers investigated the significant effects of zeolite particles on the crystallization behavior of PP as a filler. [22][23][24][25] Metin et al 26 found that PP composites containing 2 to 6 wt% natural silica-alumina zeolite with three nonionic surface modifiers obtained a significant improvement in the mechanical properties. Lv et al 27 investigated the influence of the unmodified and modified zeolites (grafting silane onto zeolite 13X and 5A) as nucleating agents on the properties of polypropylene and demonstrated that there was a substantial improvement of mechanical properties of the iPP/modified zeolite composites, especially to impact strength, compared with pure iPP.…”

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confidence: 99%

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Effect of nucleating agent supported on zeolite via the impregnation on the crystallization ability of isotactic polypropylene and its mechanism

Tong

Meng

et al. 2019

Polymers for Advanced Techs

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Addition of an α‐nucleating agent is the simple and effective method to increase nucleation efficiency of isotactic polypropylene (iPP). However, severe agglomeration and poor dispersibility of sodium 2,2′‐methylene‐bis(4,6‐di‐tertbutylphenyl) phosphate (NA11) decrease the nucleation efficiency in the iPP, and much more nucleating agent is needed to maintain the nucleating property. As a result, it becomes the key how to decrease the size of NA11 and increase the nucleating property. In this paper, zeolite 4A (Z4A) was firstly supported by NA11 through solution impregnation, and NA11 was dispersed by Z4A depending on the dispersion of zeolite as carrier for the second component. Then, the dispersed NA11 system (NA11‐Z4A) exhibited a superior nucleation behavior during the crystallization of the iPP matrix when it was used with iPP together. The isothermal and nonisothermal crystallization kinetics indicated that the NA11‐Z4A/iPP system had the best crystallization effect. Polarized optical microscopy (POM) and scanning electron microscopy (SEM) analyses showed that the size of NA11 decreased obviously when it was adsorbed on the surface of Z4A, which leads a better dispersibility of the nucleating agent and thus an accelerated nucleation process in the iPP matrix. In the end, the mechanism for the excellent dispersibility of NA11‐Z4A, which was based on hydrogen bonding between NA11 and Z4A, was confirmed by Fourier‐transform infrared spectroscopy (FTIR). Based on the research work, the solution impregnation strategy can potentially be applied to other systems to inhibit the agglomeration and improve the dispersibility of additives in iPP.

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Melting and crystallization behaviors, morphology, and mechanical properties of β‐polypropylene/polypropylene‐graft‐maleic anhydride/calcium sulfate whisker composites

Dou

Duan

2015

Polymer Composites

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The melting and crystallization behaviors, morphology, and mechanical properties of polypropylene (PP)/surface-treated calcium sulfate (CaSO 4 ) whisker (T-CSW), b-PP/T-CSW, and b-PP/polypropylene-graft-maleic anhydride (PP-g-MAH)/T-CSW composites had been investigated via differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), polarized light microscopy (PLM), scanning electron microscopy (SEM), and mechanical tests. We found that T-CSW was an a-nucleating agent and increased the crystallization temperatures of PP, but PP-g-MAH and high loadings of T-CSW had weakly negative effects on the crystallization rates of PP. The T-CSW restrained the formation of b-spherulites, and the spherulitic size decreased in the composites. PP-g-MAH improved the compatibility and adhesion between T-CSW and the matrix.

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Preparation and β-crystallization of zeolite filled isotactic polypropylene composites

Cited by 13 publications

References 43 publications

The influence of glass fibers on the morphology of β-nucleated isotactic polypropylene evaluated by differential scanning calorimetry

The influence of glass fibers on the morphology of β-nucleated isotactic polypropylene evaluated by differential scanning calorimetry

Effect of nucleating agent supported on zeolite via the impregnation on the crystallization ability of isotactic polypropylene and its mechanism

Melting and crystallization behaviors, morphology, and mechanical properties of β‐polypropylene/polypropylene‐graft‐maleic anhydride/calcium sulfate whisker composites

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