L-Lactide Polymerization in the Presence of Gaseous Nitrogen
During the ring opening polymerization of L-lactide the presence of water must be avoided since even small amounts can influence negatively on the reaction kinetic behavior. An effective way of removing water from the reaction system should be easy to implement and have comparatively low cost. T...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universidade Estadual de Londrina
2014-10-01
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| Series: | Semina: Ciências Exatas e Tecnológicas |
| Subjects: | |
| Online Access: | http://www.uel.br/revistas/uel/index.php/semexatas/article/view/17693/15227 |
| Summary: | During the ring opening polymerization of L-lactide the presence of water must be avoided since even
small amounts can influence negatively on the reaction kinetic behavior. An effective way of removing
water from the reaction system should be easy to implement and have comparatively low cost. The
objective of the work was to obtain poly (L-lactic acid) at different conditions of temperature and
catalyst concentration when gaseous nitrogen is used to purge the reactor comparing the resulting
conversion profiles and final average molar masses. Results showed that a long induction period was
observed when no gaseous nitrogen was used. It suggests that nitrogen was effective in removing the
water from the reaction system since induction periods were not observed when it was injected before
polymerization. Depolymerization was avoided when gaseous nitrogen was used resulting in higher
molar masses than the case when no purging was carried out. |
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| ISSN: | 1676-5451 1679-0375 |