Study of the rheological properties and crystallization behavior of branched PP/silicate composites

Yoon, Kyung Hwa; Park, Sung; Kim, Youn Cheol

doi:10.1038/pj.2012.68

Cited by 12 publications

(3 citation statements)

References 32 publications

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“…Traditionally, a slope of 2 in the Han plot is an indication of a homogeneous, monodisperse polymer solution or melt, and that less than 2 is an indication of a heterogeneous melt system [37]. It is also known that the Han plot is not dependent on the melt temperature and the M w of the monodispersed polymers [13,38].…”

Section: Discussionmentioning

confidence: 99%

Rheology of Polyacrylonitrile/Lignin Blends in Ionic Liquids under Melt Spinning Conditions

et al. 2019

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Lignin, while economically and environmentally beneficial, has had limited success in use in reinforcing carbon fibers due to harmful chemicals used in biomass pretreatment along with the limited physical interactions between lignin and polyacrylonitrile (PAN) during the spinning process. The focus of this study is to use lignin obtained from chemical-free oxidative biomass pretreatment (WEx) for blending with PAN at melt spinning conditions to produce carbon fiber precursors. In this study, the dynamic rheology of blending PAN with biorefinery lignin obtained from the WEx process is investigated with the addition of 1-butyl-3-methylimidazolium chloride as a plasticizer to address the current barriers of developing PAN/lignin carbon fiber precursors in the melt-spinning process. Lignin was esterified using butyric anhydride to reduce its hydrophilicity and to enhance its interactions with PAN. The studies indicate that butyration of the lignin (BL) increased non-Newtonian behavior and decreased thermo-reversibility of blends. The slope of the Han plot was found to be around 1.47 for PAN at 150 °C and decreased with increasing lignin concentrations as well as temperature. However, these blends were found to have higher elasticity and solution yield stress (47.6 Pa at 20%wt BL and 190 °C) when compared to pure PAN (5.8 Pa at 190 °C). The results from this study are significant for understanding lignin–PAN interactions during melt spinning for lower-cost carbon fibers.

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Section: Discussionmentioning

confidence: 99%

Rheology of Polyacrylonitrile/Lignin Blends in Ionic Liquids under Melt Spinning Conditions

et al. 2019

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“…One method is to increase its molecular weight through copolymerization with PS PMMA or by adding inorganic particles like silica or carbon nanotubes [1][2][3]. Adding inorganic particles has been found to be an effective way to enhance some mechanical properties of pure PP [4].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and study on properties of polypropylene composite materials/silica sand powder

2023

jsthaui

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The polypropylene/silica sand powder polymer composite materials were fabricated by using the melt mixing method in a Haake internal mixer at 190 o C. The influence of size and BCSi content on melt rheology, mechanical properties, and structural morphology was investigated. The results show the torque of the PP/BCSi composite material decreased as the BCSi content increased from 10 to 30% wt, but then increased at 40% and 50% wt. The tensile strength, elongation, and impact strength of the PP/BCSi composite were lower than that of PP, but the hardness was higher. When comparing PP/BCSi composites made with silica sand powder modified with steric acid (BCSiA) to unmodified (BCSi), those made with BCSiA had higher mechanical properties. By studying SEM images of the composite surface, we observed that BCSiA increased phase interaction, adhesion, and dispersibility of BCSi into the PP plastic substrate.

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“…Nevertheless, low-impact strength and toughness, especially at low temperatures, limited some of their industrial applications. In order to improve PP toughness, it has been studied and modified hard inorganic fillers [4], combined with thermoplastics [5], forming in situ microfibre or liquid crystal reinforcement [6] and nucleation for PP. The method of adding inorganic fillers is an effective way to enhance some of the mechanical properties of PP [4].…”

Section: Introductionmentioning

confidence: 99%

The impact of processing conditions on the mechanical properties, hardness, and structure morphology of polypropylene/silica sand powder

2023

jsthaui

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The polypropylene/silica sand powder polymer composite materials were fabricated by using the melt mixing method in a Haake internal mixer in the range of 170 o C -200 o C. The polypropylene/silica sand powder polymer composite materials were fabricated by using the melt mixing method in a Haake internal mixer with varied conditions by adjusting the temperature range from 170 o C to 200 o C, rotor speed from 40 -70rpm, and fusion time of 3 -5 min. Torque visco of materials was also recorded by Haake Polylab software during melt mixing. The result indicated that uniformly dispersed materials at 50rpm for 5 min produced good mechanical properties with a significant improvement in hardness. Fourier transform infrared spectroscopy, mechanical properties, and scanning electron microscopy (SEM) of the materials were investigated.

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Study of the rheological properties and crystallization behavior of branched PP/silicate composites

Cited by 12 publications

References 32 publications

Rheology of Polyacrylonitrile/Lignin Blends in Ionic Liquids under Melt Spinning Conditions

Rheology of Polyacrylonitrile/Lignin Blends in Ionic Liquids under Melt Spinning Conditions

Fabrication and study on properties of polypropylene composite materials/silica sand powder

The impact of processing conditions on the mechanical properties, hardness, and structure morphology of polypropylene/silica sand powder

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