When the temperature was lower than the T g of soft segments in PU, both the size and the relative concentration of free volume increased with increasing temperature for PBU and PCU.

  • 当温度低于PU软段的Tg时,两类PU的自由体积尺寸和浓度都随温度升高而增大。

  • 互联网摘选 2025-01-20 17:39:29

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