Enhancement of tensile properties of isotactic polypropylene spunbonded fabrics by a surface-modified silica/silicone copolymer additive

Caldas, V.; Brown, G. R.; Nohr, Ronald S.; MacDonald, John; Raboin, Louis

doi:10.1002/(sici)1097-4628(19970829)65:9<1759::aid-app13>3.0.co;2-i

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…Particulate inorganic fillers are widely used in thermoplastic industries to reinforce the polymer matrix and to improve heat‐resistance characteristics of materials 5, 6. The high anisotropy of the short‐fiber‐reinforced thermoplastic can also be avoided by using particulate fillers.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano‐silica filler on the rheological and morphological properties of polypropylene/liquid‐crystalline polymer blends

Zhang

Tam

Gan

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:A fumed hydrophilic nano-silica-filled polypropylene (PP) composite was blended with a liquidcrystalline polymer (LCP; Rodrun LC5000). The preblended polymer blend was extruded through a capillary die; this was followed by a series of rheological and morphological characterizations. The viscosity of the PP matrix increased with the addition of the hydrophilic nano-silica. At shear rates between 50 and 200 s Ϫ1 , the composite displays marked shear-thinning characteristics. However, the incorporation of LC5000 in the PP composite eliminated the shear-thinning characteristic, which suggests that LC5000 destroyed the agglomerated nano-silica network in the PP matrix. Although the viscosity ratio of LCP/PP was reduced after the addition of nano-silica fillers, the LCP phases existed as droplets and ellipsoids. The nano-silicas were concentrated in the LC5000 phase, which hindered the formation of LCP fibers when processed at high shear deformation. We carried out surface modification of the hydrophilic nano-silica to investigate the effect of modified nano-silica (M-silica) on the morphology of the PP/LC5000 blend system. Ethanol was successfully grafted onto the nano-silica surface with a controlled grafting ratio. The viscosity was reduced for PP filled with ethanol-M-silica when compared to the system filled with untreated hydrophilic nano-silica. The LC5000 in the (PP/M-silica)/LC5000 blend existed mainly in the form of fibrils. At high shear rates (e.g., 3000 s Ϫ1 ), the LC5000 fibril network was formed at the skin region of the extrudates. The exclusion of nano-silica in the LC5000 phase and the increased viscosity of the matrix were responsible for the morphological changes of the LCP phase.

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Section: Introductionmentioning

confidence: 99%

Effect of nano‐silica filler on the rheological and morphological properties of polypropylene/liquid‐crystalline polymer blends

Zhang

Tam

Gan

et al. 2002

J of Applied Polymer Sci

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“…Surface-modified and unmodified fumed silica particles have also been used as filler material for the reinforcement of PP fibers. [22][23][24][25] Rottstegge et al 24 reported that the unmodified fumed silica was found to have a strong influence on the mechanical fiber properties, while the surface-modified silica has only a small one. Caldas et al 25 observed that addition of an ultrafine-particle surface-modified silica pre-dispersed in an alkyl silicone to isotactic PP results in dramatic improvements in the tensile properties of fibers and spunbonded fabrics.…”

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confidence: 99%

Melt-spun talc-filled polypropylene fibers and yarns with higher thermal shock resistance

Taşcan

Nohut

2016

Textile Research Journal

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An increase in the application areas of textiles has resulted in the need for improved and additional properties and functions, which should be provided by polymers with different functionalities or the addition of particles to the fibers. In the framework of this study, microsized talc particle-filled polypropylene (PP) fibers and yarns were produced and the mechanical, physical and thermal properties of the fibers and yarns were analyzed with respect to production parameters. The main motivation of the selection of talc as the filler material is to improve the thermal shock resistance and decrease the shrinkage of PP fibers and yarns. As a result of experimentation, it was observed that an increase of talc ratio decreases the tensile strength of fibers and yarns. However, this reduction does not seem to be an obstacle to produce fabrics. Furthermore, the addition of microsized talc particles in PP yarns dramatically improved thermal shock resistance and helped to decrease the shrinkage of these yarns.

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“…If 10 samples are used for the determination of the Weibull parameters, 87% of Weibull modulus and 83% of σ 0 values of 10,000 simulations satisfy the condition given in eq. . This means that almost 15% of the calculated Weibull parameters are unreliable.…”

Section: Resultsmentioning

confidence: 99%

“…Increase in the application areas of PP fibers resulted in the need of additional properties and functions. Therefore, it has become necessary and important to produce particle‐filled PP fibers and yarns to improve material properties . Takahashi and Kimura added polydimethylsiloxane and/or oleamide to pure PP fiber and reported an improvement in the wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Determination of the minimum sample size for a reliable strength measurement of talc‐filled polypropylene fibers

Nohut

Taşcan

2016

J of Applied Polymer Sci

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Accurate determination of mechanical properties plays an important role to comment on improvement in the mechanical properties of particle-filled PP fibers. However, the existing standards are not totally suitable for reliable strength determination of particle-filled PP fibers. In the framework of this study, microsized talc particle-filled PP fibers were produced with different talc ratio and tensile strength measurements were performed with various gage lengths. Statistical Akaike Information Criterion analysis shows that strength distribution of talc-filled PP fibers is best characterized by Weibull distribution function. It is reported that, the gage length has almost no influence of Weibull parameters of pure PP fibers while strong effects on Weibull parameters of talc-filled PP fibers. It is shown that if the tensile strength of talc-filled PP fibers is to be measured, at least 50 samples, which is more than value suggested by existing standard, should be used for a reliable determination of Weibull parameters. Therefore, the main aim of this study is to question the feasibility of minimum sample size suggested by the existing ASTM D3822 standard for reliable strength measurement of talc filled PP fibers.

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Enhancement of tensile properties of isotactic polypropylene spunbonded fabrics by a surface-modified silica/silicone copolymer additive

Cited by 8 publications

References 8 publications

Effect of nano‐silica filler on the rheological and morphological properties of polypropylene/liquid‐crystalline polymer blends

Effect of nano‐silica filler on the rheological and morphological properties of polypropylene/liquid‐crystalline polymer blends

Melt-spun talc-filled polypropylene fibers and yarns with higher thermal shock resistance

Determination of the minimum sample size for a reliable strength measurement of talc‐filled polypropylene fibers

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