Non-isothermal Crystallization Kinetic Model: Theory, Development and Application
2022-01-0322
03/29/2022
- Content
- Semi-crystalline thermoplastic polymers have been poised by a renewed interest over the past decade. Though they have been continuously used in the automotive industry and other markets, high performance thermoplastics are now in the Aerospace industry target. The material's recyclable nature, low process cost and high impact resistance makes them very good candidates to succeed where thermosets have struggled. Despite many advancements in physics modeling of semi-crystalline thermoplastic manufacturing process, there are still parts of the physics that have been left out like process induced crystallinity and the inherent mechanical behavior. This work is a first step in the implementation of a process parameter-dependent crystallization kinetic model to evaluate the resultant crystallinity of thermoplastics. The proposed model is inspired by the crystallization kinetic work done by Yaghini & Peters which address fundamental aspects like primary and secondary crystallizations, lamellar thickness, and non-isothermal crystallization. In this work, the model is applied to selective laser sintering (SLS), a non-pressure and non-isotherm process, with the objective of predicting the resultant crystal structure of PA12 for various process temperature and cooling histories.
- Citation
- Lavertu, P., "Non-isothermal Crystallization Kinetic Model: Theory, Development and Application," SAE Technical Paper 2022-01-0322, 2022, .