Structure and properties for transparent polypropylene containing sorbitol‐based clarifier

Tenma, Miwa; Mieda, Naoya; Takamatsu, Shinya; Yamaguchi, Masayuki

doi:10.1002/polb.21340

Cited by 41 publications

(31 citation statements)

References 26 publications

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“…Low haze materials are usually prepared from random copolymers and optical properties are improved further by the use of clarifiers based on different sorbitol derivatives [5][6][7][8][9] . These latter additives dissolve in the polymer generating a microcrystalline structure and improve haze considerably [10][11] .…”

Section: Introductionmentioning

confidence: 99%

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Horváth

Menyhárd

Doshev

et al. 2014

ACS Appl. Mater. Interfaces

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Two soluble nucleating agents were used to modify the optical properties of nine PP homo-and random copolymers. The ethylene content of the polymers changed between 0 and 5.3 wt%.Chain regularity was characterized by the stepwise isothermal segregation technique (SIST), while optical properties by the measurement of the haze of injection molded samples.Crystallization and melting characteristics were determined by differential scanning calorimetry (DSC). The analysis of the results proved that lamella thickness and change in crystallinity influence haze only slightly. A model was introduced which describes quantitatively the dependence of nucleation efficiency and haze on the concentration of the nucleating agent. The model assumes that the same factors influence the peak temperature of crystallization and optical properties. The analysis of the results proved that the assumption is valid under the same crystallization conditions. The parameters of the model depend on the molecular architecture of the polymer. Chain regularity determines supermolecular structure and thus the dependence of optical properties on nucleation.

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Section: Introductionmentioning

confidence: 99%

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Horváth

Menyhárd

Doshev

et al. 2014

ACS Appl. Mater. Interfaces

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“…25 As shown in Figure 1, all transmitted light within the hemisphere scope can be trapped using the integrating sphere. According to ASTM D1003-61, haze is the percent of transmitted light that is scattered so that its direction deviates more than 2.58 from the direction of the incident beam.…”

Section: Transmittance and Hazementioning

confidence: 99%

“…According to ASTM D1003-61, haze is the percent of transmitted light that is scattered so that its direction deviates more than 2.58 from the direction of the incident beam. 25 As shown in Figure 1, all transmitted light within the hemisphere scope can be trapped using the integrating sphere. Haze and transmittance data are especially useful for quality control and specification purposes.…”

Section: Transmittance and Hazementioning

confidence: 99%

Light scattering materials with tunable optical properties by controlling refractive index of the dispersed phase

Liu

Dong

Xiong

et al. 2016

J of Applied Polymer Sci

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Traditionally, the morphologies of the dispersed phase in Polycarbonate (PC)/poly(styrene-co-acrylonitrile) (SAN) blends were strongly influenced if AN content in SAN changed significantly even under constant processing conditions. This would hinder the pure research intended to study the effect of the refractive index difference between the polymer host and the polymeric dispersed particles on the optical properties tough. Therefore, we respectively prepared different PC/SAN light diffusion sheets with four types of SAN containing different AN content ranging just from 20 to 25 wt %, a narrow range that sufficiently ensures the relatively stable morphology of different SAN in PC matrix. The results suggest that the refractive index of SAN increases with an decreasing AN content, thus narrowing the refractive index difference between PC and SAN and producing PC/SAN(70/30) light diffusion sheets with an increasing transmittance and decreasing haze. The interesting phenomenon is further analyzed using Mie scattering theory. V C 2016Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44156.

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“…Such fibrous structure consisting of thin crystals induces a highly organized orientation of PP chains under flow field, leading to improvement in transparency because anisotropic light scattering originating from spherulites, and polarizability fluctuations in the visible wavelength, are reduced. This behavior is pronounced for injection‐molded products . The stability of the physical gelation depends on temperature and applied shear rate .…”

Section: Introductionmentioning

confidence: 98%

Enhancement of drawdown force in polypropylene containing nucleating agent

Phulkerd

Nakabayashi

Iwasaki

et al. 2018

J of Applied Polymer Sci

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The effect of the nucleation efficiency of three commercial nucleating agents, such as 1,3:2,4‐bis(3,4‐dimethylbenzylidene)sorbitol (DMDBS), sodium 2,2′‐methylene‐bis‐(4,6‐di‐tert‐butylphenyl)phosphate (SMBP), and magnesium silicate (talc), on the melt‐stretching performance of isotactic polypropylene (PP) is studied. It is found that the addition of 0.5 wt % of a nucleating agent enhances the crystallization temperature and that effect is pronounced for DMDBS and SMBP. Furthermore, DMDBS is more efficient than the other tested nucleating agents in enhancing the drawdown force, defined as a force required for stretching a molten strand. Nanofibers of DMDBS, which show significant alignment in the flow direction, are responsible for the rapid crystallization of PP in the flow field leading to an increase of drawdown force. The stretched strand shows a highly oriented structure in which the α‐form crystals orient to the flow direction. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47295.

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Structure and properties for transparent polypropylene containing sorbitol‐based clarifier

Cited by 41 publications

References 26 publications

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers

Light scattering materials with tunable optical properties by controlling refractive index of the dispersed phase

Enhancement of drawdown force in polypropylene containing nucleating agent

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