Influence of mixing cycle on the degree of mixing of calcite‐filled polyethylene upon stretching

Kim, Kwang-Jea; Kwon, Sangmin; Kim, Hyun; Kundu, Patit Paban; Kim, Yong-Wook; Lee, Yong‐Keun; Lee, Kyu Jong; Lee, Byung H.; Choe, Soonja

doi:10.1002/app.11417

Cited by 13 publications

(1 citation statement)

References 15 publications

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“…Polyethylene (PE) is the most commonly used material in the packaging industries due to its many advantages, such as being inert, inexpensive, readily available, easy to process, flexible, and semi-permeable [1]. To change the thermal, mechanical, and permeability properties of polymer, and to reduce the production costs, inorganic fillers, such as metal oxide, metal powders, carbon black, silica, spherical or fibrous glass [2], talc, calcite [3,4], kaolin, mica [5], etc. are added.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Modification with Stearic Acid on the Dispersion of Some Inorganic Fillers in PE Matrix

et al. 2021

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To evaluate the effects of surface modification with stearic acid on the dispersion of some inorganic fillers in polyethylene (PE) matrix, masterbatches containing 20–40 wt% of stearic acid uncoated and coated inorganic fillers and the linear low-density polyethylene (LLDPE) films containing 3–7% stearic acid uncoated and coated inorganic fillers were prepared. Two types of inorganic fillers used in the masterbatch included bentonite and silica. The structural change of inorganic fillers, whose surface was modified with stearic acid, was studied using IR spectroscopy. The dispersion of inorganic fillers in LLDPE matrix was evaluated using scanning electron microscope (masterbatch samples) and optical microscope (film samples). Changes in the melting temperature of LLDPE in the presence of inorganic fillers were evaluated by using differential scanning calorimeter (DSC). The mechanical properties of the films were evaluated according to ASTM D882. Surface-treated fillers with stearic acid dispersed in the masterbatches and films better than untreated fillers did. Stearic acid did not change the melting temperature of the filler/PE masterbatches. The mechanical properties of the films containing stearic acid coated fillers were higher than those containing unmodified fillers.

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Section: Introductionmentioning

confidence: 99%

Effects of Surface Modification with Stearic Acid on the Dispersion of Some Inorganic Fillers in PE Matrix

et al. 2021

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Effect of calcite and calcite/zeolite hybrid fillers on LLDPE and PP composites

et al. 2004

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ABSTRACT:The comparative tensile and impact properties and fracture morphologies between calcite and calcite/zeolite (hybrid) filled linear low-density polyethylene (LLDPE) and polypropylene (PP) composites have been studied. The incorporation of fillers into LLDPE, whether calcite or calcite/zeolite hybrid fillers, does not alter the T m of LLDPE, but slightly reduces the T m of PP. The melting peak area representing the heat of fusion of the crystal decreases with fillers; the effect of the calcite and the hybrid filler would be the same. The impact strength, Young's modulus, and yield stress of the calcite and the hybrid filled LLDPE increased, indicating a reinforcing effect of the fillers. In addition, the filled LLDPE decreases in elongation at break (EB) and ultimate tensile strength. However, the hybrid LLDPE composite exhibits slightly higher Young's modulus and ultimate tensile strength than the calcite one, while the same values of impact strength and yield stress were observed. In the PP system, the Young's modulus is enhanced, whereas the rest of the mechanical properties were reduced. From SEM photomicrographs of the hybrid filled composites, the tensile fractured surface CALCITE AND CALCITE/ZEOLITE HYBRID FILLERS ON LLDPE AND PP COMPOSITESof LLDPE dumbbell bar exhibits tearing surfaces while the composite shows formation of air holes and cracks in the LLDPE and PP system, respectively. Because of improved Young's modulus, yield strength, impact strength, and morphological observation along with substantial extension, the filled LLDPE composite with calcite/zeolite hybrid fillers is worth using for micro-porous film applications. C

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Effect of different film preparation procedures on the thermal, morphological and mechanical properties of pure and calcite‐filled HDPE films

Kundu

Biswas

Kim

et al. 2003

J of Applied Polymer Sci

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ABSTRACT:The effect of different film preparation procedures on the thermal, morphological and mechanical properties of high density polyethylene (HDPE) films have been studied using differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXRD), atomic force microscopy (AFM), scanning electron microscopy (SEM) and ultimate tensile testing. Film preparation procedures included variation in cooling methods, including quenching, forces (fanning) and natural cooling and techniques such as extrusion followed by melt squeezing and compression molding. The heat of fusion (from DSC), the degree of crystallinity (from WAXRD) and the crystallite size (from WAXRD and AFM) were found to be highest for naturally cooled specimens, followed by fan-cooled and quenched ones. AFM images of surface topology exhibit stacked lamellar morphology for forcefully cooled (fan-cooled and quenched) samples and spherulitic 'lozenges' for naturally cooled ones. The Young's modulus and yield stress [from the universal testing machine (UTM)] were highest for naturally cooled samples, followed by fan-cooled and quenched ones. Among the calcite-filled composites, the 'base film,' which was prepared by extrusion followed by melt squeezing and natural cooling, exhibited the lowest heat of fusion and degree of crystallinity and a similar crystallite size relative to compression-molded films. Lower yield stress, tensile strength and Young's modulus and higher elongation at break were observed for the base film in comparison to the naturally cooled composite film. The low degree of crystallinity and crystallite size in the 'base film' explain all of its mechanical and morphological properties.

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Influence of mixing cycle on the degree of mixing of calcite‐filled polyethylene upon stretching

Cited by 13 publications

References 15 publications

Effects of Surface Modification with Stearic Acid on the Dispersion of Some Inorganic Fillers in PE Matrix

Effects of Surface Modification with Stearic Acid on the Dispersion of Some Inorganic Fillers in PE Matrix

Effect of calcite and calcite/zeolite hybrid fillers on LLDPE and PP composites

Effect of different film preparation procedures on the thermal, morphological and mechanical properties of pure and calcite‐filled HDPE films

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