cold crystallisation

https://doi.org/10.1351/goldbook.12748
Polymer crystallisation brought about from a glass, from a liquid-crystalline state, or a state displaying a low degree of crystallinity at temperatures a little above the glass-transition temperature.
Note: Cold crystallisation is frequently observed if crystallisation was not completed before sample vitrification.
Source:
PAC, 2013, 85, 1017. (Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)) on page 1022 [Terms] [Paper]