Electrical Behaviour and Spherulites Morphology of HDPE/PP Polyblends with HDPE as Base Material

Sahoo, Prakash Chandra; Murmu, Rabiranjan; Patra, Sarat Chandra; Dutta, Chiranjit; Sutar, Harekrushna

doi:10.4236/msa.2018.910060

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…The nanocomposites were further examined by polarizing light microscopy (PLM) and the spherulite images captured during cooling are presented below (Figure 4, 125 • C, magnification ×40). Regarding neat HDPE, well-organized spherulites are generally observed [41][42][43][44]. In the case of nanocomposites, the ones with the lowest CaPim contents exhibit few and small crystallites.…”

Section: Thermal Properties and Crystallinitymentioning

confidence: 97%

Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites

Samiotaki,

Tarani,

Karavasili

et al. 2024

Macromol

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In the present research work, calcium pimelate (CaPim) was synthesized and investigated as an additive for high-density polyethylene (HDPE). HDPE/CaPim nanocomposites were prepared by melt-mixing, with CaPim content ranging from 0.1% to 1%, affording white homogeneous materials. The chemical structure of the nanocomposites and the incorporation of CaPim was confirmed by infrared spectroscopy. The surficial morphology and the additive distribution were examined by scanning electron microscopy. Differential scanning calorimetry and X-ray diffraction measurements showed that the thermal transitions and crystal structure of HDPE are not affected by the incorporation of CaPim, while the mechanical properties are retained overall. This study focuses on the thermal degradation of HDPE nanocomposites, investigating the degradation mechanism and kinetic parameters through various analytical methods. Isoconversional techniques, including the Friedman method, Vyazovkin analysis, and Ozawa Flynn Wall analysis, were employed to calculate activation energies (Eα). The degradation mechanism and kinetic triplet were determined based on a multivariate non-linear regression method (model-fitting). Finally, the presence of a CaPim additive was shown to increase the Eα of thermal degradation, consistent with the calculated dependence of Eα on the degree of conversion and the improved thermal stability of the HDPE matrix.

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Section: Thermal Properties and Crystallinitymentioning

confidence: 97%

Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites

Samiotaki,

Tarani,

Karavasili

et al. 2024

Macromol

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“…Graphene has found extensive applications in engineering, science and technology as a favorable reinforcing material for different polymers [1][2][3][4][5][6][7][8]. Polypropylene (PP) is a widely accepted thermoplastic polymer among the polyolefin groups [9][10][11]. PP is widely available, relatively inexpensive, easy to handle and allows for recycling.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene and Graphene Nanocomposites: Effects of Selected 2D-Nanofiller’s Plate Sizes on Fundamental Physicochemical Properties

et al. 2022

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The authors developed a nanocomposite using polypropylene (PP) and graphene nanoplatelets (GNPs) with a melt mixing method. Virgin PP was filled with three sets of GNPs with a fixed thickness (15 nm) and surface area (50–80 m2/g). The selected H-type GNPs had three different sizes of 5, 15 and 25 µm. The nanocomposites were made by loading GNPs at 1, 2 and 3 wt.%. Mechanical analysis was carried out by performing tensile, flexural and impact strength tests. The crystalline, micro-structural, thermal and dynamic mechanical properties were assessed through XRD, FESEM, PLM, DSC, TGA and DMA tests. It was observed that all three types of GNPs boosted the mechanical strength of the polymer composite. Increasing the nanofiller size decreased the tensile strength and the tensile modulus, increased the flexural strength and flexural modulus, and increased the impact strength. Maximum tensile strength (≈41.18 MPa) resulted for the composite consisting 3 wt.% H5, whereas maximum flexural (≈50.931 MPa) and impact (≈42.88 J/m) strengths were observed for nanocomposite holding 3 wt.% H25. Graphene induced the PP’s crystalline phases and structure. An improvement in thermal stability was seen based on the results of onset degradation (TD) and melting (Tm) temperatures. Graphene increased the crystallization (Tc) temperatures, and acted like a nucleating agent. The experimental analysis indicated that the lateral size of graphene plays an important role for the nanocomposite’s homogeneity. It was noted that the small-sized GNPs improved dispersion and decreased agglomeration. Thus overall, small-sized GNPs are preferable, and increasing the lateral size hardly establishes feasible characteristics in the nanocomposite.

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“…These polymeric materials must perform at the imposed conditions. Blend of HDPE-PP has been prepared [6] [7] and its mechanical, thermal, crystallization and electrical properties has been studied. An experimental approach using universal testing machine (UTM) was employed to study the effect of low strain rate loading on HDPE/saw dust composites [8].…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Effects on Tensile Properties of HDPE-PP Composite Prepared by Extrusion and Injection Moulding Method

Sutar¹,

Maharana²,

Dutta³

et al. 2019

MSA

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The present paper investigates the effect of strain rate on different tensile properties of high density polyethylene (HDPE) and polypropylene (PP) composite. Tensile specimens of virgin HDPE-PP composites are prepared via twin screw extruder and injection moulding methods as per ASTM D638-02a (Type-I); with gage length 50 mm, width 13 mm and thickness 3 mm. Composites are fabricated with PP as reinforcing agent at a loading rate of 10%, 20%, 30%, 40% and 50% by weight. Experiments are carried out at room temperature of 23˚C and absolute humidity of 54% at a cross head speed of 30, 40, 50, 60 and 70 mm/min. Stress and strain values at yield and break points are reported. Atomic force microscopy (AFM) is used to study the distribution of polymer molecules in the mixture and surface roughness. As in last, experiments are designed by Taguchi optimization method to find out the dominating factors on tensile strength.

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Electrical Behaviour and Spherulites Morphology of HDPE/PP Polyblends with HDPE as Base Material

Cited by 5 publications

References 17 publications

Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites

Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites

Polypropylene and Graphene Nanocomposites: Effects of Selected 2D-Nanofiller’s Plate Sizes on Fundamental Physicochemical Properties

Strain Rate Effects on Tensile Properties of HDPE-PP Composite Prepared by Extrusion and Injection Moulding Method

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