書誌事項
- タイトル別名
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- Glassy State and Glass Transition-Its Elucidation and New Applications. II. Correlation Between Free Volume Evaluated from Positron Annihilation Lifetime and Gas Diffusion Coefficient of Glassy Polymers.
- ヨウデンシ ショウメツ ジュミョウ カラ ヒョウカシタ ガラスジョウ コウブン
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Diffusion coefficients D for CO2 and CH4 as well as lifetime τ3 and intensity I3 of ortho-positronium (o-Ps) were measured for five polymers at temperatures T from glass transition temperature Tg down to Tg-150 K. There was a fairly good correlation between τ3 and log (D/T) in the temperature range above Tg-90 K. Assuming exponential distribution of the size of free volume holes in the glassy state, a mean size of the free volume holes (vh) was evaluated from τ3 by using a method previously applied for rubbery polymers. There was a good correlation between log (D/T) and 1/<vh> for these glassy polymers and the previously investigated rubbery polymers, indicating that a free volume model for diffusion is applicable in the glassy state at temperatures not much below Tg as well as in the rubbery state. Even in the glassy state, generation, and dissipation of the free volume holes with smaller sizes might occur rapidly in concert with local motion of polymer chains and side groups. This rapid generation/dissipation process enables penetrants in glassy polymers to have frequent chances of diffusion jump, as is the case in the rubbery state.
収録刊行物
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- 高分子論文集
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高分子論文集 53 (12), 834-841, 1996
公益社団法人 高分子学会
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詳細情報 詳細情報について
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- CRID
- 1390001206521888896
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- NII論文ID
- 10003285029
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- NII書誌ID
- AN00085011
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- ISSN
- 18815685
- 03862186
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- NDL書誌ID
- 4106524
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
