Temperature dependence of light scattering by low-loss poly(methyl methacrylate) glasses

Norihisa Tanio, Yasuhiro Koike, Yasuji Ohtsuka

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A poly(methyl methacrylate) (PMMA) glass with the lowest light scattering loss (13 dB km-1 at 633 nm wavelength) and with no angular dependence in its scattering intensity was prepared by radical polymerization above the glass transition temperature (Tg) (Sample A). The temperature dependence of the light scattering intensity for this PMMA glass was investigated, in comparison with the PMMA glass polymerized below Tg and having excess scattering loss (hundreds dB km-1) due to large-size heterogeneous structures (Sample B). In the sample A, the polarized scattering intensity (Vv) slightly changed below Tg and increased smoothly with increasing temperature above Tg in accordance with the fluctuation theory for structureless liquids. On the other hand, in the sample B, an abrupt decrease in Vv scattering around Tg was observed with increasing temperature. It is suggested that the different trends of temperature dependence of light scattering and of excess scattering even in highly purified PMMA glasses depend on whether the strain homogeneities generated during the polymerization process are already relaxed above Tg or retained below Tg, and that the scattering behavior is not directly affected by first order structures such as molecular weight, tacticity, and remaining monomers.

Original languageEnglish
Pages (from-to)119-125
Number of pages7
JournalPolymer Journal
Volume21
Issue number2
Publication statusPublished - 1989

Fingerprint

Polymethyl Methacrylate
Polymethyl methacrylates
Light scattering
Scattering
Glass
Temperature
Free radical polymerization
Monomers
Molecular weight
Polymerization
Wavelength
Liquids

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Temperature dependence of light scattering by low-loss poly(methyl methacrylate) glasses. / Tanio, Norihisa; Koike, Yasuhiro; Ohtsuka, Yasuji.

In: Polymer Journal, Vol. 21, No. 2, 1989, p. 119-125.

Research output: Contribution to journalArticle

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abstract = "A poly(methyl methacrylate) (PMMA) glass with the lowest light scattering loss (13 dB km-1 at 633 nm wavelength) and with no angular dependence in its scattering intensity was prepared by radical polymerization above the glass transition temperature (Tg) (Sample A). The temperature dependence of the light scattering intensity for this PMMA glass was investigated, in comparison with the PMMA glass polymerized below Tg and having excess scattering loss (hundreds dB km-1) due to large-size heterogeneous structures (Sample B). In the sample A, the polarized scattering intensity (Vv) slightly changed below Tg and increased smoothly with increasing temperature above Tg in accordance with the fluctuation theory for structureless liquids. On the other hand, in the sample B, an abrupt decrease in Vv scattering around Tg was observed with increasing temperature. It is suggested that the different trends of temperature dependence of light scattering and of excess scattering even in highly purified PMMA glasses depend on whether the strain homogeneities generated during the polymerization process are already relaxed above Tg or retained below Tg, and that the scattering behavior is not directly affected by first order structures such as molecular weight, tacticity, and remaining monomers.",
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T1 - Temperature dependence of light scattering by low-loss poly(methyl methacrylate) glasses

AU - Tanio, Norihisa

AU - Koike, Yasuhiro

AU - Ohtsuka, Yasuji

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N2 - A poly(methyl methacrylate) (PMMA) glass with the lowest light scattering loss (13 dB km-1 at 633 nm wavelength) and with no angular dependence in its scattering intensity was prepared by radical polymerization above the glass transition temperature (Tg) (Sample A). The temperature dependence of the light scattering intensity for this PMMA glass was investigated, in comparison with the PMMA glass polymerized below Tg and having excess scattering loss (hundreds dB km-1) due to large-size heterogeneous structures (Sample B). In the sample A, the polarized scattering intensity (Vv) slightly changed below Tg and increased smoothly with increasing temperature above Tg in accordance with the fluctuation theory for structureless liquids. On the other hand, in the sample B, an abrupt decrease in Vv scattering around Tg was observed with increasing temperature. It is suggested that the different trends of temperature dependence of light scattering and of excess scattering even in highly purified PMMA glasses depend on whether the strain homogeneities generated during the polymerization process are already relaxed above Tg or retained below Tg, and that the scattering behavior is not directly affected by first order structures such as molecular weight, tacticity, and remaining monomers.

AB - A poly(methyl methacrylate) (PMMA) glass with the lowest light scattering loss (13 dB km-1 at 633 nm wavelength) and with no angular dependence in its scattering intensity was prepared by radical polymerization above the glass transition temperature (Tg) (Sample A). The temperature dependence of the light scattering intensity for this PMMA glass was investigated, in comparison with the PMMA glass polymerized below Tg and having excess scattering loss (hundreds dB km-1) due to large-size heterogeneous structures (Sample B). In the sample A, the polarized scattering intensity (Vv) slightly changed below Tg and increased smoothly with increasing temperature above Tg in accordance with the fluctuation theory for structureless liquids. On the other hand, in the sample B, an abrupt decrease in Vv scattering around Tg was observed with increasing temperature. It is suggested that the different trends of temperature dependence of light scattering and of excess scattering even in highly purified PMMA glasses depend on whether the strain homogeneities generated during the polymerization process are already relaxed above Tg or retained below Tg, and that the scattering behavior is not directly affected by first order structures such as molecular weight, tacticity, and remaining monomers.

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