ポリスチレン射出成形品のエンタルピー緩和に伴う非晶構造変化と耐熱性の関係

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  • 垰 幸作
    地方独立行政法人 大阪産業技術研究所
  • 山田 浩二
    地方独立行政法人 大阪産業技術研究所
  • 羽田野 歩美
    Depeartment of Material and Science, School of Engineering, The University of Shiga Prefecture
  • 竹下 宏樹
    Depeartment of Material and Science, School of Engineering, The University of Shiga Prefecture
  • 東 青史
    地方独立行政法人 大阪産業技術研究所
  • 籠 恵太郎
    地方独立行政法人 大阪産業技術研究所
  • 桑城 志帆
    地方独立行政法人 大阪産業技術研究所
  • 平野 寛
    地方独立行政法人 大阪産業技術研究所
  • 徳満 勝久
    Depeartment of Material and Science, School of Engineering, The University of Shiga Prefecture

書誌事項

タイトル別名
  • Relationship between Dynamic Viscoelasticity and Amorphous Structural Changes Associated with Enthalpy Relaxation in Polystyrene Injection Moldings
  • ポリスチレン シャシュツ セイケイヒン ノ エンタルピー カンワ ニ トモナウ ヒショウ コウゾウ ヘンカ ト タイネツセイ ノ カンケイ

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抄録

<p>In this study, we investigated the relationship between the amorphous structural changes associated with enthalpy relaxation and the Heat distortion temperature (HDT) in polystyrene injection moldings.<br>It was clarified that the longer heat treatment time, the more enthalpy relaxation progressed. Also, an extrapolation glass transition temperature (Tig) increased by heat treatment. In addition, long-time heat treatment caused the high-temperature shift of the storage modulus (E') decrease temperature near glass transition temperature (Tg). Since the increase in Tig and the high-temperature shift of E' decrease temperature correlated with the enthalpy relaxation, they can be closely related to the enthalpy relaxation. Thus, we considered that the segment motion of polymer chain was suppressed as the enthalpy relaxation progressed.<br>At long-term heat treatment, the enthalpy relaxation and the HDT were correlated. Furthermore, density increased by the heat treatment, and the increase in density also correlated with the progress of the enthalpy relaxation. Therefore, we considered that the polymer chains densely packed along with the enthalpy relaxation. As the result of polymer chains being densely packed, the segment motion of polymer chains near Tg can be suppressed and the HDT increased.</p>

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