Material Drying
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PI aerogel preparation shrinkage and cracking
Problem Phenomenon
PI aerogel shrinks severely after supercritical drying or freeze drying
Cause Analysis
The gel network strength is insufficient to withstand capillary forces during drying; solvent exchange insufficient
Solution
Strengthen the gel network (increase crosslinking or polymerization concentration); fully exchange solvent; optimize drying conditions
Key Takeaway
The core of PI aerogel preparation is protecting the nanoporous structure
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