Effect of CaCO3 on the crystallization behaviour of polypropylene

Khare, Atul; Mitra, Anjana; Radhakrishnan, S.

doi:10.1007/bf01160816

Cited by 53 publications

(39 citation statements)

References 11 publications

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“…These results are similar to the CaCO 3 /PP system where CaCO 3 particles of 6m reduced the crystallization half-time significantly. 32 The t 1/2 for the pure PEEK 2.05 min is reduced to 1.08 min for the PEEK with 40 wt % Al 2 O 3 . Thus, Al 2 O 3 particles accelerate the crystallization process of pure PEEK.…”

Section: Table III Thermal Properties Of Composites During Cooling Cymentioning

confidence: 99%

High performance polymer composites on PEEK reinforced with aluminum oxide

Goyal

Negi

Tiwari

2006

J of Applied Polymer Sci

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A study on high performance poly(etherether-ketone) (PEEK) composites prepared by incorporating aluminum oxide (Al 2 O 3 ), 0 to 50 wt % by hot compaction at 15 MPa and 350°C was described. Density, thermogravimetric analysis/differential scanning calorimetry, and scanning electron microscopy (SEM) were employed to evaluate their density, thermal stability, crystallinity, and morphology. Experimental density was found higher than theoretical density, which indicates that composite samples are sound. It was found that the addition of micron sized (Ͻ 15 m) Al 2 O 3 increased the peak crystallization temperature by 12°C when compared with neat PEEK with insignificant increase in melting temperature. Half-time of crystallization is reduced from 2.05 min for the neat PEEK to 1.08 min for PEEK incorporated with 30 wt % Al 2 O 3 because of the strong nucleation effect of Al 2 O 3 . The thermal stability of composites in air atmosphere was increased by 26°C. However, thermal stability in nitrogen atmosphere decreases at lower concentration of Al 2 O 3 but increases above 20 wt % of Al 2 O 3 . Uniform dispersion of Al 2 O 3 particles was observed in PEEK polymer matrix by SEM.

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Section: Table III Thermal Properties Of Composites During Cooling Cymentioning

confidence: 99%

High performance polymer composites on PEEK reinforced with aluminum oxide

Goyal

Negi

Tiwari

2006

J of Applied Polymer Sci

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“…One well-known example is the addition of heterogeneous nucleation agents, usually micronsized crystalline particles, to induce crystallization at higher temperatures and rates. [1][2][3][4][5] Particle addition also creates a uniform dispersion of nucleation sites and affords some control of spherulite size. Another well-known technique for modifying crystallization is the addition of plasticizers, which reduce both the melting temperature (T m ) and the crystallization temperature (T c ).…”

Section: Introductionmentioning

confidence: 99%

Crystallization of tethered polyethylene in confined geometries

Weimann

Hajduk

Chu

et al. 1999

J. Polym. Sci. B Polym. Phys.

105

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“…Another approach tries to introduce types of coupling agent, which can improve compatibility of PP and CaCO 3 . Promotion of interfacial shear strength (IFSS) is the main purpose of this group of investigations [4][5][6][7]. The third approach pays attention to role of calcium carbonate parameters, such as weight percent, shape, size and surface function, on the mechanical properties of PP/CaCO 3 .…”

Section: Introductionmentioning

confidence: 99%

“…The results of their studies show that addition of CaCO 3 to PP causes to increase crystallization rate and spherulite size owing to nucleating agent effect. Although the role of CaCO 3 on crystal structure of PP has not been recognized yet, but most investigators reported that it has a trivial effect on crystal structure [1][2][3][4]. Another approach tries to introduce types of coupling agent, which can improve compatibility of PP and CaCO 3 .…”

Section: Introductionmentioning

confidence: 99%

“…With regards to high using rate, many researchers who study composite materials interest to investigate this composite in more details. According to author's knowledge, their works can be divided to three approaches [1][2][3][4][5][6][7][8][9][10]. The first approach concentrates on the role of filler on crystal structure, spherulite size and crystallization rate of matrix.…”

Section: Introductionmentioning

confidence: 99%

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