Journal
IRANIAN POLYMER JOURNAL
Volume 29, Issue 5, Pages 423-432Publisher
SPRINGER
DOI: 10.1007/s13726-020-00807-7
Keywords
Lactic acid; Condensation polymerization; Triazine-based dendrimer; Hydrophilicity; Biodegradable
Categories
Funding
- University of Tabriz [816430115]
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Science
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Nowadays, extensive environmental problems due to the use of synthetic polymers have provoked efforts for their replacement with biopolymers as the most important research priorities. Polylactic acid (PLA) is one of the well-known biodegradable biopolymers. In this work, for the first time, PLA was modified with hydrophilic triazine-based dendrimers to obtain PLA with improved hydrophilic properties. In this regard, at first, dl-lactic acid (DLLA) was polymerized through the melt polycondensation to obtain poly-dl-lactic acid (PDLLA). The effects of reaction time and catalyst types on the molecular weight of the PDLLA were investigated. Also, the thermal behavior of PDLLAs with different molecular weights was evaluated using differential scanning calorimetry (DSC) technique. The obtained results from the DSC analysis showed that the PDLLA with higher molecular weight has a higher glass transition temperature (T-g) and melting point (T-m). In the following, various generations (G) of the triazine-based dendrimers were synthesized. To increase the hydrophilicity of the prepared PDLLA, chemical modification of PDLLA with the different generations of triazine-based dendrimer (G(1), G(1.5) and G(2)) was performed. Due to the modification of PDLLA with dendrimers, the number of functional groups and hydrophilicity of PDLLA increased. Based on the obtained results, it is expected that the prepared systems could be a good and promising candidate for the production of biocompatible plastics with more hydrolytic degradation ability.
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