Date of Award
Spring 5-15-2024
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Chemistry
First Advisor
Dr. Ram K. Gupta
Second Advisor
Dr. Khamis Siam
Third Advisor
Dr. Timothy Dawsey
Fourth Advisor
Dr. Anuradha Ghosh
Keywords
Bio-based Polyester, Even-odd Polyester, 1-4 and 1-6 Diol, Diacid, Polyester Film, Film Property.
Abstract
Most synthetic polyesters are not biodegradable. However, certain natural polyesters and some synthetic ones are. Synthetic polyesters are widely utilized in apparel. Synthesizing environmentally friendly materials from renewable feedstock is crucial for reducing pressure on non-renewable resources such as petroleum products. Azelaic acid (AA), pimelic acid (PA), and glutaric acid (GA) are naturally occurring saturated dicarboxylic acids or can be synthesized from naturally occurring raw materials. These are renewable, environmentally beneficial, and suitable alternatives for non-biodegradable polyesters.
This research focuses on the synthesis, structure, and physical characterization of saturated linear polyesters. The polyesters are produced through melt-polycondensation of bio-based materials such as AA, PA, and GA with diols of different carbon chain lengths, such as 1,4-butanediol (BD) and 1,6-hexanediol (HD). The process involves a two-step polymerization esterification and polycondensation using stannous octoate as a catalyst and hydroquinone as a radical inhibitor. Optimization of polymerization conditions, including catalyst amount, second-stage reaction temperature, and time, to achieve high molecular mass in the longer chain were prepared. Analysis of chemical structures through 1H nuclear magnetic resonance (NMR) revealed the elimination of side reactions in the obtained polyesters. Differential scanning calorimetry (DSC) was employed to analyze physical properties, and the impact of dicarboxylate chain length and long short diol on crystalline structure and thermo-mechanical properties was investigated. Interestingly, increasing the dicarboxylic acid chain length increases the melting point. The same result was obtained with increasing diol chain length except for GA. With the increase in dicarboxylic acid chain length, the film becomes flexible due to the rise in mobility. The highest molecular weight obtained is GA-BD. GA-BD film reflects good flexibility and load capacity even after remolding. In conclusion, this study highlights the synthesis of polyesters with good thermomechanical properties and film flexibility, positioning them as promising materials for practical applications.
Recommended Citation
Patel, Jainishkumar, "SYNTHESIS, CHARACTERIZATION, AND APPLICATION OF LINEAR, BIO-BASED POLYESTER OF GLUTARIC, PIMELIC, AND AZELAIC ACID WITH BUTANE DIOL AND HEXANE DIOL" (2024). Electronic Theses & Dissertations. 828.
https://digitalcommons.pittstate.edu/etd/828
