Effect of organic peroxides on the morphological, thermal and tensile properties of EVA-organoclay nanocomposites

Mishra, Shivani B.; Luyt, A. S.

doi:10.3144/expresspolymlett.2008.31

Cited by 32 publications

(20 citation statements)

References 16 publications

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“…For instance, the intensity of EOC5/C0.5 and EOC5/C1 was found to be 78% and 33% of the intensity of EOC5, respectively. This could be a sign of reduction of the extent of ordering for OMMT layers and is consistent with the formation of more exfoliated clay plateltes in the cured samples …”

Section: Resultssupporting

confidence: 78%

Effect of Organoclay Ordering and Agglomeration on Morphology and Mechanical Properties of Uncured and Dynamically Cured Ethylene‐Octene Copolymer Nanocomposites

Razavi‐Nouri

Sabet

Tayefi

et al. 2016

Macro Materials & Eng

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In this work, the effects of organoclay (OMMT) and cross‐linking agent on thermal and mechanical properties as well as the morphology of dynamically cured nanocomposites based on ethylene‐octene copolymer are studied. The nanocomposites containing 1, 3, 5, and 7 wt% OMMT are first prepared and then cured with 0.5 and 1 wt% dicumyl peroxide. Low angle X‐ray scattering and transmission electron microscopy reveal that the size of clay tactoids is increased with the increase of OMMT content within the nanocomposites especially for the uncross‐linked matrix. In addition, the distance between adjacent clay layers is increased for the cured nanocomposites containing 1 and 3 wt% OMMT, however, it remains relatively unchanged for higher amounts of the nanofiller. In uncross‐linked systems, the nanocomposites containing up to 5 wt% OMMT exhibit a remarkable enhancement in stress and strain at break compared to that of the matrix alone. With the addition of further OMMT content, although the stress and strain at break are both decreased, still remained much higher than that of the pristine copolymer. A mechanism is also proposed to compare the microstructure of the uncured and cured nanocomposites before and after stretching.

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Section: Resultssupporting

confidence: 78%

Effect of Organoclay Ordering and Agglomeration on Morphology and Mechanical Properties of Uncured and Dynamically Cured Ethylene‐Octene Copolymer Nanocomposites

Razavi‐Nouri

Sabet

Tayefi

et al. 2016

Macro Materials & Eng

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“…Therefore, the lack of a peak in XRD patterns does not prove or disprove the existence of exfoliated clay platelets in the polymer matrix [53][54][55]. In contrast, TEM is an excellent qualitative method in the characterization of polymer/clay nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

Encapsulation of organomodified montmorillonite with PMMA via in situ SR&NI ATRP in miniemulsion

et al. 2012

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Encapsulation of organomodified montmorillonite within poly (methyl methacrylate) via in situ atom transfer radical polymerization with simultaneous reverse and normal initiation system (SR&NI ATRP) was successfully performed. Miniemulsion polymerization technique has been employed for its abundant advantages to encapsulate inorganic materials. Successful SR&NI ATRP was carried out using 4,4′-dinonyl-2,2′-bipyridine (dNbPy) as a hydrophobic ligand and cetyltrimethylammonium bromide (CTAB) as an effective cationic surfactant at high temperatures. Homogeneous distribution of droplets and particles with sizes in the range of around 170 nm was evaluated by dynamic light scattering (DLS) analysis. Final monomer conversion and molecular weight were determined by gravimetry and size exclusion chromatography (SEC) respectively. By increasing nanoclay content, conversion and molecular weight of nanocomposites decreased. Meanwhile, an increase in PDI values was also observed. X-ray diffraction (XRD) analysis results display organoclay layers disordered and delaminated in the polymer matrix. Thermal stability improvement of all the nanocomposites in comparison with the neat polymer was revealed by thermogravimetric analysis (TGA). Homogeneous distribution of spherical particles with sizes in the range of 170 nm was demonstrated by scanning electron microscopy (SEM) images. These results are complied with the DLS results. Transmission electron microscopy (TEM) image display a dispersion of partially exfoliated clay stacks in the matrix of PMNM 2.

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“…The moisture absorbed by the fibres can be reduced by chemical modifications of fibres such as acetylation, methylation, cyanoethylation, benzoylation, permanganate treatment, acrylation etc. [11][12][13][14][15]. Acetylation of natural fibres is a well-known esterification method causing plasticization of cellulosic fibres.…”

Section: Introductionmentioning

confidence: 99%

The effects of acetylation on properties of flax fibre and its polypropylene composites

Błędzki¹,

Mamun²,

Lucka-Gabor³

et al. 2008

Express Polym. Lett.

428

233

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Abstract. Flax fibre was modified with acetylation. The influence of the acetylation on the structure and properties of flax fibre were investigated as well as modified flax fibre reinforced polypropylene composites were also prepared. The catalyst was used to accelerate acetylation reaction rate. Flax fibre was characterised after modification. Surface morphology, moisture absorption property, components content, degree of polymerisation, crystallinity of cellulose and thermal stability of flax fibres were studied. Due to acetylation, the flax fibre surface morphology and moisture resistance properties improved remarkably. Flax fibre (modified and unmodified) reinforced polypropylene composites were fabricated with 30 wt% fibre loading. The mechanical properties were investigated for those composites. Tensile and flexural strengths of composites were found to increase with increasing degree of acetylation up to 18% and then decreased. Charpy impact strengths of composites were found to decrease with increasing degree of acetylation. Owing to addition of coupling agent (maleated polypropylene -MAH), the tensile and flexural strength properties were found to increase in between 20 to 35% depending on degree of acetylation.

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Effect of organic peroxides on the morphological, thermal and tensile properties of EVA-organoclay nanocomposites

Cited by 32 publications

References 16 publications

Effect of Organoclay Ordering and Agglomeration on Morphology and Mechanical Properties of Uncured and Dynamically Cured Ethylene‐Octene Copolymer Nanocomposites

Effect of Organoclay Ordering and Agglomeration on Morphology and Mechanical Properties of Uncured and Dynamically Cured Ethylene‐Octene Copolymer Nanocomposites

Encapsulation of organomodified montmorillonite with PMMA via in situ SR&NI ATRP in miniemulsion

The effects of acetylation on properties of flax fibre and its polypropylene composites

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