Synthesis of biodegradable polyester based on renewable resources

V. Jovanović, I. Ristić, A. Miletić, S. Cakić, Jelena Tanasić, J. Budinski-Simendic
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引用次数: 3

Abstract

Due to the growing problem caused by waste plastics, academia and industry, invest great dials of efforts to solve this problem and enable the sustainability of polymeric materials. One way, which can successfully solve this problem, is certainly the synthesis of new polymeric materials based on renewable raw materials. Therefore, in this paper, synthesis of polyester based on ricinoleic acid (as well as the methyl ester of ricinoleic acid) is presented, in order to obtain the polyol of the desired molar masses. The polymerization of the ricinoleic acid was performed in the presence of diethylene glycol, as an initiator, and titanium isopropoxide, as a catalyst. By analyzing the molar masses of the obtained polyesters, it has been confirmed that the control of the molecular weight of the polyricinoleic acid can be successfully accomplished by the addition of a precisely determined amount of diethylene glycol, thus enabling in this way the synthesis of polyols of desired properties. The molecular structure of the synthesized polyols is confirmed by FTIR and NMR spectroscopy. The analysis of the thermal properties showed that the glass transition temperatures of the synthesized polyols range from -70 to -80oC, which makes it possible to apply these materials in low-temperature applications. The slight increasment of thermal stability is observed, only with the increasment of molecular weight, which was confirmed by TG analysis. The viscosity measurement results confirmed that as the molar weight of synthesized polyester increases, the viscosity of the samples also increases.
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基于可再生资源的可生物降解聚酯的合成
由于废塑料造成的问题日益严重,学术界和工业界都投入了大量的精力来解决这一问题,并使聚合物材料具有可持续性。一种可以成功解决这个问题的方法,当然是基于可再生原料合成新的聚合物材料。因此,本文提出了以蓖麻油酸(以及蓖麻油酸甲酯)为原料合成聚酯,以获得所需摩尔质量的多元醇。以二甘醇为引发剂,异丙醇钛为催化剂,进行了蓖麻油酸的聚合反应。通过分析所得聚酯的摩尔质量,证实了通过添加精确确定量的二甘醇可以成功地控制聚蓖麻油酸的分子量,从而能够以这种方式合成具有所需性能的多元醇。合成的多元醇的分子结构经FTIR和NMR确证。热性能分析表明,合成的多元醇的玻璃化转变温度在-70 ~ -80℃之间,可用于低温应用。热稳定性略有提高,但仅随分子量的增加而增加,热重分析证实了这一点。粘度测量结果证实,随着合成聚酯摩尔质量的增加,样品的粘度也随之增加。
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