Abstract
Abstract Crude dimer acid (DA) was prepared with soybean oil (SO) used as raw material and organic montmorillonite as a catalyst. Fourier transform infrared (FTIR) spectroscopy, hydrogen nuclear magnetic resonance (1H-NMR) and gel permeation chromatography (GPC) were used to characterize the structure of DA. It was demonstrated that the synthesis of crude DA using SO was feasible. A molecular weight of 995–1304 g/mol was obtained by GPC measurement. Then, a type of polyester was synthesized using the crude DA and polyethylene glycol. The effects of reaction temperatures and different catalysts on the conversion rate were explored. The results showed that the esterification conversion rate was improved to 83.13% when SnCl2 was used as the catalyst, with a reaction temperature of 180°C The FTIR, 1H-NMR, GPC and TGA were used to characterize the structure and performance of this polyester. The polyester had a molecular weight ranging from 8259 to 10892 g/mol. In addition, its biodegradable behavior was analyzed by the soil burial test and was compared with that of terephthalic acid. The results showed that the composites prepared from DA had a pronounced effect on weight loss during biodegradation.
Highlights
In today’s market, the requirements of renewable materials are increasing
The results showed that the esterification conversion rate was improved to 83.13% when SnCl2 was used as the catalyst, with a reaction temperature of 180°C The Fourier transform infrared (FTIR), 1H-NMR, gel permeation chromatography (GPC) and TGA were used to characterize the structure and performance of this polyester
14 g of crude dimer acid (DA) was poured into a three-necked flask, to which 25 g of polyethylene glycol (PEG) and 0.12 g of catalyst were added
Summary
In today’s market, the requirements of renewable materials are increasing. First, lower costs for producing renewable fuels are needed compared with those incurred from using petroleum derivatives. The obtained biodiesels were analyzed by hydrogen nuclear magnetic resonance (1H-NMR), 13C-NMR and Fourier transform infrared (FTIR) spectroscopy as well as by standard physico-chemical techniques These results indicated that the biodiesel products had high quality and purity. Istadi et al [7] prepared a novel type of solid acid catalysts, sulphated zinc oxide, in the transesterification of soybean oil with methanol to produce biodiesel. Because of their biodegradability, nontoxicity and low production cost, vegetable oils have been used as raw materials for the preparation of novel polymers instead of traditional polymers. Sahoo Sushanta et al [11] used the in situ method to synthesize a novel type of bioresin and epoxidize SO to blend with epoxy in different ratios It may act as a kind of reactive diluent, improving the processibility and toughened nature of the epoxy. The preparation, structure, morphology, thermal stability and biodegradation behavior of this polymer were investigated
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