Mechanical and rheological properties of composites based on polyolefin and mineral additives

Silva, A.L.N. da; Rocha, Marisa Cristina Guimarães; Moraes, M.A.R.; Valente, Cristhiane Alvim; Coutinho, Fernanda M. B.

doi:10.1016/s0142-9418(01)00047-2

Cited by 118 publications

(58 citation statements)

References 6 publications

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“…This might indicate that the particle morphology changes has not thoroughly completed for all the particles by the heat treatment conditions employed in this study, even after the aragonite-calcite phase transition has completed. The densities of aragonite and calcite are 2.93 g/mm 3 and 2.71 g/mm 3 , respectively. Therefore, volume expansion of about 8%, which corresponds Figure 4 shows low-and high-magnification SEM images for aragonite powder (Figure 4a,c) and for calcite powder (Figure 4b,d).…”

Section: Thermal Analysismentioning

confidence: 96%

“…For instance, mechanical properties of composite materials can be affected by particle morphology and size of fillers [1][2][3][4][5]. In particular, anisotropic materials such as needle-like or fiber-like particles are known to improve mechanical strength of composites much more effectively than spherical particles, because of increase in filler entanglement density.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, previous studies have shown that dimensional stability and impact strength of plastic composite materials [1][2][3][4][5], mechanical properties of rubber materials [11,12], rheological properties of sealants [13] and gloss characteristics of paper [14,15] can be controlled by changing shape/size of PCCs. Anhydrous calcium carbonate has three crystalline polymorphs: calcite, aragonite and vaterite.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition

Kezuka¹,

Kawai²,

Eguchi³

et al. 2017

Minerals

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Calcium carbonate (CaCO 3 ) occurs in two major polymorphs: rhombohedral calcite and orthorhombic aragonite, the latter is thermodynamically metastable. In this study, we first prepared aragonite needle-like particles by introducing CO 2 -containing gas into Ca(OH) 2 aqueous slurry. Then, the resulted aragonite particles were heat treated at 500 • C for 1 h, in order to induce the aragonite-calcite phase transition. Particle structures before and after the heat treatment were characterized mainly by powder X-ray diffractometry (XRD), field emission-scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). We found that single-crystalline calcite needle-like particles with zigzag surface structures can be fabricated using the phase transition.

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Section: Thermal Analysismentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition

Kezuka¹,

Kawai²,

Eguchi³

et al. 2017

Minerals

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“…Nanoadditives, such as TiO 2 , CaCO 3 , clay or ZnO are intended to improve barrier properties as well as mechanical or thermoplastics properties in different plastic materials, like coatings, packaging, etc. [16]. Thus it seemed reasonable to modify the PP fibres by CaCO 3 .…”

Section: Introductionmentioning

confidence: 97%

The Effect of Inorganic Nanoadditives on the Thermal, Mechanical and UV Radiation Barrier Properties of Polypropylene Fibres

Ujhelyiová¹,

Slobodová²,

Ryba³

et al. 2012

OJOPM

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The objective of this study of modified polypropylene (PP) fibres using nanoadditives (nano-CaCO 3 and Cloisite 30B) was to determine the influence of these additives on thermal and mechanical properties, but especially on the barrier properties of the nanocomposite fibres against UV radiation. The DSC data obtained from measurements of PP/CaCO 3 or PP/C30B nanocomposite fibres were used for determination of the constants n and K of the Avrami equation and in the estimation of other thermal properties of the fibres, such as their crystallization half-time t 1/2 , rate of crystallization  1/2 , the necessary time for maximum crystallization t max and free energy per unit area of surface in the lamella perpendicular to the axis of a high-molecular chain  e . The nano-CaCO 3 or Closite 30B fillers (pre-treated separately in three different solvents: glycerine, acetone and water) did not influence the melting temperatures but caused an increase in PP crystallization temperatures in comparison with the pure PP fibres. The pre-treatments of nanoadditives resulted in increase of n, K,  1/2 values and decrease of t 1/2 , t max as well as the values of free surface energies per unit area of the modified PP fibres. There was also observed a decrease in the mechanical properties, however, there was an increase of barrier properties against UV radiation of nanocomposite PP fibres in comparison with neat PP fibres, which was one of the main objectives of the study.

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“…For this reason the research and development activities focused on composites containing inorganic filler is of expanding importance. Matrix modification, degree of crystallinity, type of reinforcement, quality of adhesion between filler and matrix, size, shape, size distribution of filler particles, addition of coupling agents affects the physico-chemical and thermo-mechanical properties, as well as internal structure and strength of aggregates [12][13][14][15]. In most cases, silane coupling agents are added to react with inorganic substrates in order to form stable covalent bonds, thus altering the physical interactions of treated 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 3 negatively charged over the entire pH range, whilst the edges are positive at low pH, but negative at high pH, with an iso electric point at about pH 7.…”

Section: Introductionmentioning

confidence: 99%

The effect of low temperature air plasma treatment on physico-chemical properties of kaolinite/polyethylene composites

Krásný

Lapčík

Lapčı́ková

et al. 2014

Composites Part B: Engineering

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The effect of low temperature air plasma treatment on the physico-chemical properties of kaolinite/polyethylene composites was studied. Moreover, the kaolin powder was treated with (3-aminopropyl)triethoxysilane as a coupling agent to improve the interfacial adhesion between powder filler and polymer matrix. The modification of the kaolin resulted in a notable improvement in the mechanical strength and elastic modulus of filled polyethylene composites, compared to the virgin polymers. Observed improvement of the tensile strength became more marked as the filler loading increased, indicating an improved degree of filler/matrix interaction. Simultaneously the improvement of the fracture toughness of prepared HDPE and LLDPE kaolinite composites was confirmed. Moreover, the morphology of the grains distribution and tensile fracture surface was examined by electron microscopy confirming excellent distribution of the filler in the polymer matrix.

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Mechanical and rheological properties of composites based on polyolefin and mineral additives

Cited by 118 publications

References 6 publications

Fabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition

Fabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition

The Effect of Inorganic Nanoadditives on the Thermal, Mechanical and UV Radiation Barrier Properties of Polypropylene Fibres

The effect of low temperature air plasma treatment on physico-chemical properties of kaolinite/polyethylene composites

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