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Synthesis of fully bio-based and solvent free non-isocyanate poly (ester amide/urethane) networks with improved thermal stability on the basis of vegetable oils
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2018-07-11 , DOI: 10.1016/j.polymdegradstab.2018.07.010
Abdolreza Farhadian , Abbas Ahmadi , Ismail Omrani , Ahmad Babaei Miyardan , Mikhail A. Varfolomeev , Mohammad Reza Nabid

The purpose of this study is to synthesize non-isocyanate poly (ester amide/urethane) networks, based entirely on vegetable oil through a green method, i.e., without solvent and having any rigid and aromatic structures to improve their thermal stability. For this purpose, first, three amines were synthesized from castor oil and oleic acid. Second, carbonated sunflower oil (CSFO) was obtained by reaction of epoxidized sunflower oil with CO2 at atmospheric pressure. In the final step, CSFO easily reacted with bio-based amines by melt-blending without catalyst to give corresponding non-isocyanate polyurethane (NIPU) networks. The Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), X-ray powder diffraction (XRD), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) techniques were applied to characterize the structural, thermal and physical features of NIPU networks. In addition, to determine the environmental stability the water absorption amount and the degradation percentage were calculated in the deionized water and phosphate saline buffer, respectively. These NIPU networks showed an excellent thermal stability (T5 wt% between 323 and 386 °C), low water absorption and degradation (4–10 and 1.04–1.40 wt% respectively). The results show the potential of this environmentally friendly strategy for preparing bio-based NIPU for high performances. Furthermore, the presence of an aliphatic ester group and their biodegradability nature may also make them proper for biological and/or biomedical applications.



中文翻译:

在植物油的基础上合成具有改善的热稳定性的完全生物基和无溶剂的非异氰酸酯聚(酯酰胺/氨基甲酸酯)网络

这项研究的目的是通过绿色方法完全基于植物油合成非异氰酸酯聚(酯酰胺/氨基甲酸酯)网络,即不使用溶剂,并具有任何刚性和芳族结构以改善其热稳定性。为此,首先,由蓖麻油和油酸合成三种胺。其次,通过环氧化的葵花籽油与CO 2反应获得碳酸葵花籽油(CSFO)。在大气压下。在最后一步中,CSFO无需催化剂即可通过熔融共混轻松地与生物基胺反应,得到相应的非异氰酸酯聚氨酯(NIPU)网络。使用傅里叶变换红外光谱(FTIR),核磁共振(NMR),X射线粉末衍射(XRD),差示扫描量热法(DSC),动态力学分析(DMA)和热重分析(TGA)技术进行表征NIPU网络的结构,热和物理特性。另外,为了确定环境稳定性,分别在去离子水和磷酸盐盐水缓冲液中计算吸水量和降解百分数。这些NIPU网络显示出出色的热稳定性(T在323至386°C之间为5 wt%),低吸水率和降解(分别为4-10和1.04-1.40 wt%)。结果表明,这种环境友好型策略对于制备高性能生物基NIPU的潜力。此外,脂族酯基的存在及其生物可降解性也可以使它们适合用于生物和/或生物医学应用。

更新日期:2018-07-11
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